From e58af98f218d1a0e851c156d683ea44bc3c63d31 Mon Sep 17 00:00:00 2001
From: "Calum H." <calum@modrinth.com>
Date: Fri, 24 Jul 2026 14:06:38 +0100
Subject: [PATCH] feat: instance sharing thru shared-instances service (#6569)

* feat: implement instance share page + search_users backend call

* feat: invite players modal

* feat: use tanstack queries for friends sync across app pages

* feat: base shared instances implementation

* fix: admon style

* feat: impl instance admonitions like server panel

* fix: impl get + del usage

* feat: support modpack links

* feat: invite notif accepting

* fix: lint + fmt

* feat: impl install to play

* feat: impl usage of UpdateToPlayModal

* feat: warnings on deleting/disabling shared-instance version content

* fix: send instance name

* feat: align with backend

* feat: shared instances qa

* feat: wrong account protection

* feat: qa

* fix: smartly apply updates

* fix: install bug

* fix: 401/404 differentiation

* fix: fmt+prepr

* feat: qa

* feat: qa

* fix: signing out messes up revoke/deleted checks

* feat: qa

* fix: fmt + lint

* feat: lock content if part of shared instance

* fix: lint

* [do not merge] feat: rough invite links impl temp (#6666)

* fix: wrong cmd

* feat: invite page

* fix: server-manager DTO mismatch

* fix: drop anonymous invite link acceptance

* refactor: structured shared-instance unavailable errors

* refactor: centralise error presentations

* refactor: dedupe shared instance diff detection

* fix: logging in reqwests

* refactor: move app.vue shared instances into handler

* refactor: break up Share.vue

* refactor: split up shared instances state outside of instance index

* refactor: dedicated shared instances install/update modals + split up page

* refactor: centralized managed content

* refactor: split up install shared to own runner + shared.rs split up

* refactor: dedupe sql for instance metadata enrichmnt

* refactor: friends composable + dedupe friends logic across usages

* chore: reduced unused code

* fix: align with backend

* fix: lint

* fix: file sha changes

* fix: invite links not working due to icon signed

* feat: qa

* feat: reporting frontend dummy

* fix: try use header

* remove: file hash field

* fix: pin box

* feat: malware warning for shared instances

* fix: cache rule

* feat: config files syncing

* feat: disable config sharing

* fix: header

* fix: use mark ready

* fix: dont cause push update for configs

* fix: lint

* feat: sharing page in settings

* feat: move config + change flow

* fix: qa

* fix: lint prepr

* feat: proxy file upload thru shared instances backend

* fix: use collapisible

* fix: push config

* fix: config

* feat: swap out sign in modal for new one

* fix: report flow

* fix: exclude configs.zip from external warnings

* fix: nuxi init

* fix: config bundle downloading

* fix: error notif

* fix: polling

* fix: qa

* fix: lint + prepr

* feat: shared instances moderation frontend + hook up report flow

* fix: report copy

* fix: lint

* fix: lint

* fix: modrinth ids being undefined

* feat: instance quarantining

* fix: prepr + fmt

* fix: quarantined -> locked terminology

* fix: missing endpoint impls + fmt

* fix: missing api in build.rs

* fix: share tab jittery

* fix: fmt

*PT bug

* fix: invites count as users even if pending

* fix: prepr

* fix: invite page owner in users list

* fix: lint

* fix: qa

* fix: lint

* fix: members stale not clearing

* fix: invite use joined_at field

* fix: lint

* fix: qa

---------

Co-authored-by: sychic <47618543+Sychic@users.noreply.github.com>
---
 apps/app-frontend/src/App.vue                 |  131 +-
 .../src/components/GridDisplay.vue            |   15 +-
 .../src/components/RowDisplay.vue             |   15 +-
 .../src/components/ui/Instance.vue            |   22 +-
 .../src/components/ui/friends/FriendsList.vue |   91 +-
 .../ui/instance-page-header/index.vue         |  188 ++-
 .../instance/instance-admonitions/index.vue   |  116 ++
 .../instance-admonitions-messages.ts          |   69 +
 ...ance-admonitions-shared-instance-stale.vue |   66 +
 ...dmonitions-shared-instance-unavailable.vue |   51 +
 ...onitions-shared-instance-wrong-account.vue |   78 ++
 .../ui/instance/instance-admonitions/types.ts |   12 +
 .../InstallationSettings.vue                  |   99 +-
 .../ui/instance_settings/SharingSettings.vue  |   42 +
 .../ui/modal/AuthGrantFlowWaitModal.vue       |   43 -
 .../ui/modal/InstallToPlayModal.vue           |    8 +-
 .../ui/modal/InstanceSettingsModal.vue        |   11 +
 .../ui/modal/ModrinthAccountRequiredModal.vue |  265 ++++
 .../components/ui/modal/UpdateToPlayModal.vue |   27 +-
 .../SharedInstanceAlreadyInstalledModal.vue   |  100 ++
 ...edInstanceInstallationSettingsControls.vue |  195 +++
 .../SharedInstancePublishModal.vue            |  189 +++
 .../SharedInstanceUpdateModal.vue             |  131 ++
 .../shared-instance-install-modal/index.vue   |  533 ++++++++
 .../shared-instance-install-summary.vue       |   60 +
 .../use-shared-instance-preview-content.ts    |  135 ++
 .../shared-instance-invite-handler/index.vue  |   46 +
 .../shared-instance-invite-parser.ts          |   29 +
 .../shared-instance-invite-types.ts           |   29 +
 .../use-shared-instance-invite-handler.ts     |  252 ++++
 .../src/components/ui/world/InstanceItem.vue  |   11 +-
 .../components/ui/world/RecentWorldsList.vue  |    3 +
 .../src/components/ui/world/WorldItem.vue     |   41 +-
 .../browse/install-job-notifications.ts       |    7 +
 .../instances/use-managed-content-policy.ts   |  124 ++
 .../src/composables/use-friends.ts            |  148 +++
 .../src/composables/users/use-user-query.ts   |   17 +
 apps/app-frontend/src/config.ts               |    4 +
 apps/app-frontend/src/helpers/errors.ts       |   11 +
 apps/app-frontend/src/helpers/friends.ts      |  107 ++
 apps/app-frontend/src/helpers/install.ts      |  144 +-
 apps/app-frontend/src/helpers/instance.ts     |   93 +-
 apps/app-frontend/src/helpers/mr_auth.ts      |    6 +-
 apps/app-frontend/src/helpers/reports.ts      |   19 +
 .../src/helpers/shared-instance-errors.ts     |   98 ++
 apps/app-frontend/src/helpers/types.d.ts      |   33 +-
 apps/app-frontend/src/helpers/users.ts        |   11 +
 .../app-frontend/src/locales/de-CH/index.json |    3 -
 .../app-frontend/src/locales/de-DE/index.json |    3 -
 .../app-frontend/src/locales/en-US/index.json |  378 +++++-
 .../src/locales/es-419/index.json             |    3 -
 .../app-frontend/src/locales/fr-FR/index.json |    3 -
 .../app-frontend/src/locales/hu-HU/index.json |    3 -
 .../app-frontend/src/locales/it-IT/index.json |    3 -
 .../app-frontend/src/locales/ko-KR/index.json |    3 -
 .../app-frontend/src/locales/nl-NL/index.json |    3 -
 .../app-frontend/src/locales/pl-PL/index.json |    3 -
 .../app-frontend/src/locales/pt-BR/index.json |    3 -
 .../app-frontend/src/locales/ru-RU/index.json |    3 -
 .../app-frontend/src/locales/sr-CS/index.json |    3 -
 .../app-frontend/src/locales/sv-SE/index.json |    3 -
 .../app-frontend/src/locales/tr-TR/index.json |    3 -
 .../app-frontend/src/locales/uk-UA/index.json |    3 -
 .../app-frontend/src/locales/vi-VN/index.json |    3 -
 .../app-frontend/src/locales/zh-CN/index.json |    3 -
 .../app-frontend/src/locales/zh-TW/index.json |    3 -
 .../app-frontend/src/pages/instance/Index.vue |  331 ++++-
 apps/app-frontend/src/pages/instance/Mods.vue |  165 ++-
 .../src/pages/instance/Worlds.vue             |    3 +
 apps/app-frontend/src/pages/instance/index.js |    3 +-
 .../src/pages/instance/share/index.vue        |  373 ++++++
 .../share/shared-instance-members-table.vue   |  304 +++++
 .../shared-instance-remove-member-modal.vue   |  122 ++
 .../shared-instance-share-empty-state.vue     |   15 +
 .../share/shared-instance-share-types.ts      |   20 +
 .../use-shared-instance-invite-candidates.ts  |  105 ++
 .../share/use-shared-instance-invite-link.ts  |   63 +
 .../share/use-shared-instance-members.ts      |  241 ++++
 .../instance/use-shared-instance-state.ts     |  228 ++++
 apps/app-frontend/src/pages/project/Index.vue |    2 +-
 .../src/providers/instance-backup.ts          |   25 +
 apps/app-frontend/src/providers/setup/auth.ts |   14 +-
 apps/app-frontend/src/routes.js               |    9 +
 apps/app-frontend/vite.config.ts              |    2 +-
 apps/app/build.rs                             |   32 +-
 apps/app/capabilities/plugins.json            |    2 +
 apps/app/src/api/install.rs                   |   70 +
 apps/app/src/api/instance.rs                  |  166 ++-
 apps/app/src/api/mod.rs                       |   15 +-
 apps/app/src/api/mr_auth.rs                   |    3 +-
 apps/app/src/api/reports.rs                   |   15 +
 apps/app/src/api/users.rs                     |   13 +
 apps/app/src/main.rs                          |    8 +-
 apps/frontend/.env.local                      |    1 +
 apps/frontend/.env.prod                       |    1 +
 apps/frontend/.env.staging                    |    1 +
 apps/frontend/.env.staging-archon             |    1 +
 apps/frontend/nuxt.config.ts                  |   12 +
 .../ui/SharedInstanceInviteOpenInAppModal.vue |  274 ++++
 .../ui/moderation/ModerationReportCard.vue    |  453 ++++++-
 .../SharedInstanceReportContext.vue           |  442 +++++++
 .../src/components/ui/report/ReportInfo.vue   |   14 +-
 .../src/components/ui/thread/ThreadView.vue   |    1 +
 apps/frontend/src/error.vue                   |    1 +
 apps/frontend/src/helpers/api.ts              |    8 +-
 apps/frontend/src/helpers/moderation.ts       |   46 +-
 apps/frontend/src/locales/en-US/index.json    |   51 +
 .../frontend/src/middleware/project.global.ts |    1 +
 .../src/pages/dashboard/notifications.vue     |    9 +-
 .../src/pages/moderation/reports/[report].vue |    5 +-
 .../src/pages/moderation/reports/index.vue    |   17 +-
 apps/frontend/src/pages/share/[inviteId].vue  |  262 ++++
 .../src/providers/setup/modrinth-client.ts    |    1 +
 apps/frontend/src/server/utils/api-client.ts  |    3 +
 apps/frontend/wrangler.jsonc                  |    2 +
 .../src/routes/v3/version_creation.rs         |    4 +-
 .../api-client/src/core/abstract-client.ts    |    6 +
 packages/api-client/src/modules/index.ts      |    8 +
 .../src/modules/labrinth/images/v3.ts         |    2 +-
 .../api-client/src/modules/labrinth/types.ts  |    7 +-
 .../modules/shared-instances/instances/v1.ts  |   66 +
 .../modules/shared-instances/invites/v1.ts    |   21 +
 .../modules/shared-instances/moderation/v1.ts |   41 +
 .../src/modules/shared-instances/types.ts     |  101 ++
 .../src/modules/shared-instances/users/v1.ts  |   21 +
 packages/api-client/src/modules/types.ts      |    1 +
 .../src/platform/xhr-upload-client.ts         |    2 +
 packages/api-client/src/types/client.ts       |    6 +
 packages/api-client/src/types/request.ts      |    1 +
 packages/app-lib/.env.local                   |    1 +
 packages/app-lib/.env.prod                    |    1 +
 .../app-lib/.env.prod-with-staging-archon     |    1 +
 packages/app-lib/.env.staging                 |    1 +
 ...32383be454526177686a0685a988af747db0f.json |  296 +++++
 ...209885ef8e87ad2a8666a9cf1c851a2948cbc.json |   12 +
 ...dac61544130300cdf2cfc8deb7fbf2efaf8c7.json |  248 ----
 ...881fd9c44bccaedb9b06585ff8f76146c6e57.json |   12 +
 ...a2c8b9074904d1012079660de316a20e7dfa.json} |   28 +-
 ...156fd72100b0cf97b4ecb11045c6c4f550652.json |   12 +
 ...e7f0614e912494f850e77dfc502b1afe7c42a.json |  296 +++++
 ...2a6590b89c4f72449fdd34a7f140e2a11bf04.json |  296 +++++
 ...00cae0b4b758c0674ac81659ee9d86667f19c.json |   12 +
 ...36b774d1b506e6cf5f2ab38469e9e3e6c9b6d.json |  248 ----
 ...8af544c08d3e274a930a68daf3e94e3612243.json |   12 +
 ...df95c67b5ceda04aa1b0eb782b581e23ec06b.json |   12 +
 ...5ee588e751fdc3f18c48bc4cfd94504c37306.json |  248 ----
 ...563cebedb6b8add6c936c551a857783645ff8.json |   12 -
 ...2d429a2cc73bc2c752594fcad7da19967ff7b.json |  248 ----
 .../20260630120000_shared-instance-role.sql   |    2 +
 ...20260707103000_shared-instance-manager.sql |    2 +
 ...0707110000_shared-instance-linked-user.sql |    2 +
 ...9190000_shared-instance-server-manager.sql |    5 +
 .../20260723120000_quarantined-instances.sql  |    4 +
 packages/app-lib/src/api/handler.rs           |   22 +-
 packages/app-lib/src/api/instance.rs          |   23 +
 .../src/api/instance/content_set_diff.rs      |  152 +++
 .../app-lib/src/api/instance/lifecycle.rs     |   17 +-
 packages/app-lib/src/api/instance/projects.rs |  111 +-
 packages/app-lib/src/api/instance/run.rs      |   28 +
 .../app-lib/src/api/instance/shared/client.rs | 1014 ++++++++++++++
 .../app-lib/src/api/instance/shared/diff.rs   |  432 ++++++
 .../src/api/instance/shared/install.rs        |  574 ++++++++
 .../src/api/instance/shared/invites.rs        |  184 +++
 .../app-lib/src/api/instance/shared/mod.rs    |  140 ++
 .../src/api/instance/shared/publish.rs        | 1163 +++++++++++++++++
 .../app-lib/src/api/instance/shared/types.rs  |  162 +++
 packages/app-lib/src/api/mod.rs               |    5 +-
 packages/app-lib/src/api/mr_auth.rs           |   15 +-
 packages/app-lib/src/api/reports.rs           |   46 +
 packages/app-lib/src/api/users.rs             |   32 +
 packages/app-lib/src/error.rs                 |   21 +
 packages/app-lib/src/event/mod.rs             |    3 +
 packages/app-lib/src/install/mod.rs           |   11 +-
 packages/app-lib/src/install/model.rs         |   69 +-
 packages/app-lib/src/install/recovery.rs      |  292 ++++-
 packages/app-lib/src/install/runner.rs        |  278 +++-
 .../app-lib/src/install/shared_instance.rs    | 1016 ++++++++++++++
 packages/app-lib/src/launcher/mod.rs          |   31 +-
 packages/app-lib/src/state/friends.rs         |    5 +
 packages/app-lib/src/state/instance_types.rs  |   17 +-
 .../state/instances/adapters/filesystem.rs    |    5 +-
 .../instances/adapters/sqlite/content_rows.rs |  218 ++-
 .../adapters/sqlite/instance_rows.rs          |  620 +++++----
 .../commands/apply_content_install.rs         |   38 +
 .../commands/apply_content_update.rs          |   64 +-
 .../state/instances/commands/edit_instance.rs |   21 +
 .../state/instances/commands/get_instance.rs  |   71 +-
 .../state/instances/commands/list_content.rs  |   23 +-
 .../src/state/instances/commands/mod.rs       |    6 +
 .../instances/commands/shared_instance.rs     |  184 +++
 .../instances/commands/sync_content_files.rs  |   19 +
 .../app-lib/src/state/instances/content.rs    |    2 +
 packages/app-lib/src/state/instances/mod.rs   |    4 +
 .../src/state/instances/model/content_set.rs  |    9 +
 .../app-lib/src/state/instances/model/link.rs |   82 +-
 .../app-lib/src/state/instances/watcher.rs    |   42 +-
 packages/app-lib/src/state/mr_auth.rs         |    4 +
 packages/app-lib/src/util/fetch.rs            |   17 +-
 .../branding/illustrations/invite-bg.webp     |  Bin 0 -> 83234 bytes
 packages/assets/generated-icons.ts            |    2 +
 packages/assets/icons/file-cog.svg            |   25 +
 packages/assets/index.ts                      |    2 +
 packages/moderation/src/types/reports.ts      |    7 +-
 packages/path-util/src/lib.rs                 |   43 +
 .../ui/src/components/base/Admonition.vue     |   63 +-
 .../ui/src/components/base/FileTreeSelect.vue |   27 +-
 .../base/page-header/metadata/index.vue       |    2 +-
 .../metadata/page-header-metadata-item.vue    |    8 +-
 packages/ui/src/components/index.ts           |    1 +
 .../components/modal/InstallToPlayModal.vue   |  111 --
 packages/ui/src/components/modal/NewModal.vue |   18 +-
 packages/ui/src/components/modal/index.ts     |    1 -
 .../components/nav/PopupNotificationPanel.vue |   27 +-
 .../notifications/NotificationToast.vue       |   54 +-
 packages/ui/src/components/sharing/index.ts   |    2 +
 .../sharing/invite-players-modal/index.vue    |  393 ++++++
 ...nvite-players-modal-invite-link-editor.vue |  167 +++
 .../invite-players-modal-user-row.vue         |  101 ++
 .../sharing/invite-players-modal/types.ts     |   36 +
 .../use-invite-players-search.ts              |  226 ++++
 .../src/layouts/shared/browse-tab/layout.vue  |    2 +-
 .../components/ContentCardTable.vue           |   18 +-
 .../components/ContentModpackCard.vue         |  143 +-
 .../components/ContentSelectionBar.vue        |   12 +-
 .../modals/ConfirmDeletionModal.vue           |   40 +-
 .../components/modals/ConfirmDisableModal.vue |  103 ++
 .../modals/ConfirmModpackUpdateModal.vue      |    4 +
 .../components/modals/ConfirmUnlinkModal.vue  |   21 +-
 .../components/modals/ModpackContentModal.vue |  116 +-
 .../src/layouts/shared/content-tab/index.ts   |    2 +
 .../src/layouts/shared/content-tab/layout.vue |  191 ++-
 .../content-tab/providers/content-manager.ts  |    9 +-
 .../src/layouts/shared/content-tab/types.ts   |   18 +
 .../components/ContentDiffModal.vue           |  239 +++-
 .../shared/installation-settings/layout.vue   |   36 +-
 .../providers/installation-settings.ts        |    8 +
 .../shared/installation-settings/types.ts     |   15 +-
 packages/ui/src/locales/ar-SA/index.json      |    4 -
 packages/ui/src/locales/cs-CZ/index.json      |   10 -
 packages/ui/src/locales/de-CH/index.json      |   10 -
 packages/ui/src/locales/de-DE/index.json      |   10 -
 packages/ui/src/locales/en-US/index.json      |  126 +-
 packages/ui/src/locales/es-419/index.json     |   10 -
 packages/ui/src/locales/es-ES/index.json      |    9 -
 packages/ui/src/locales/fr-FR/index.json      |    9 -
 packages/ui/src/locales/he-IL/index.json      |    3 -
 packages/ui/src/locales/hu-HU/index.json      |    9 -
 packages/ui/src/locales/id-ID/index.json      |   10 -
 packages/ui/src/locales/it-IT/index.json      |    9 -
 packages/ui/src/locales/ja-JP/index.json      |    9 -
 packages/ui/src/locales/ko-KR/index.json      |    9 -
 packages/ui/src/locales/ms-MY/index.json      |   10 -
 packages/ui/src/locales/nl-NL/index.json      |    9 -
 packages/ui/src/locales/no-NO/index.json      |   10 -
 packages/ui/src/locales/pl-PL/index.json      |    9 -
 packages/ui/src/locales/pt-BR/index.json      |    9 -
 packages/ui/src/locales/pt-PT/index.json      |   10 -
 packages/ui/src/locales/ru-RU/index.json      |    9 -
 packages/ui/src/locales/sr-CS/index.json      |   10 -
 packages/ui/src/locales/sv-SE/index.json      |   10 -
 packages/ui/src/locales/tr-TR/index.json      |    9 -
 packages/ui/src/locales/uk-UA/index.json      |    9 -
 packages/ui/src/locales/vi-VN/index.json      |   10 -
 packages/ui/src/locales/zh-CN/index.json      |   10 -
 packages/ui/src/locales/zh-TW/index.json      |   10 -
 packages/ui/src/providers/auth.ts             |   10 +-
 .../NotificationToasts.stories.ts             |    2 +-
 .../sharing/InvitePlayersModal.stories.ts     |  202 +++
 turbo.jsonc                                   |    1 +
 269 files changed, 18202 insertions(+), 2579 deletions(-)
 create mode 100644 apps/app-frontend/src/components/ui/instance/instance-admonitions/index.vue
 create mode 100644 apps/app-frontend/src/components/ui/instance/instance-admonitions/instance-admonitions-messages.ts
 create mode 100644 apps/app-frontend/src/components/ui/instance/instance-admonitions/instance-admonitions-shared-instance-stale.vue
 create mode 100644 apps/app-frontend/src/components/ui/instance/instance-admonitions/instance-admonitions-shared-instance-unavailable.vue
 create mode 100644 apps/app-frontend/src/components/ui/instance/instance-admonitions/instance-admonitions-shared-instance-wrong-account.vue
 create mode 100644 apps/app-frontend/src/components/ui/instance/instance-admonitions/types.ts
 create mode 100644 apps/app-frontend/src/components/ui/instance_settings/SharingSettings.vue
 delete mode 100644 apps/app-frontend/src/components/ui/modal/AuthGrantFlowWaitModal.vue
 create mode 100644 apps/app-frontend/src/components/ui/modal/ModrinthAccountRequiredModal.vue
 create mode 100644 apps/app-frontend/src/components/ui/shared-instances/SharedInstanceAlreadyInstalledModal.vue
 create mode 100644 apps/app-frontend/src/components/ui/shared-instances/SharedInstanceInstallationSettingsControls.vue
 create mode 100644 apps/app-frontend/src/components/ui/shared-instances/SharedInstancePublishModal.vue
 create mode 100644 apps/app-frontend/src/components/ui/shared-instances/SharedInstanceUpdateModal.vue
 create mode 100644 apps/app-frontend/src/components/ui/shared-instances/shared-instance-install-modal/index.vue
 create mode 100644 apps/app-frontend/src/components/ui/shared-instances/shared-instance-install-modal/shared-instance-install-summary.vue
 create mode 100644 apps/app-frontend/src/components/ui/shared-instances/shared-instance-install-modal/use-shared-instance-preview-content.ts
 create mode 100644 apps/app-frontend/src/components/ui/shared-instances/shared-instance-invite-handler/index.vue
 create mode 100644 apps/app-frontend/src/components/ui/shared-instances/shared-instance-invite-handler/shared-instance-invite-parser.ts
 create mode 100644 apps/app-frontend/src/components/ui/shared-instances/shared-instance-invite-handler/shared-instance-invite-types.ts
 create mode 100644 apps/app-frontend/src/components/ui/shared-instances/shared-instance-invite-handler/use-shared-instance-invite-handler.ts
 create mode 100644 apps/app-frontend/src/composables/instances/use-managed-content-policy.ts
 create mode 100644 apps/app-frontend/src/composables/use-friends.ts
 create mode 100644 apps/app-frontend/src/composables/users/use-user-query.ts
 create mode 100644 apps/app-frontend/src/helpers/errors.ts
 create mode 100644 apps/app-frontend/src/helpers/reports.ts
 create mode 100644 apps/app-frontend/src/helpers/shared-instance-errors.ts
 create mode 100644 apps/app-frontend/src/helpers/users.ts
 create mode 100644 apps/app-frontend/src/pages/instance/share/index.vue
 create mode 100644 apps/app-frontend/src/pages/instance/share/shared-instance-members-table.vue
 create mode 100644 apps/app-frontend/src/pages/instance/share/shared-instance-remove-member-modal.vue
 create mode 100644 apps/app-frontend/src/pages/instance/share/shared-instance-share-empty-state.vue
 create mode 100644 apps/app-frontend/src/pages/instance/share/shared-instance-share-types.ts
 create mode 100644 apps/app-frontend/src/pages/instance/share/use-shared-instance-invite-candidates.ts
 create mode 100644 apps/app-frontend/src/pages/instance/share/use-shared-instance-invite-link.ts
 create mode 100644 apps/app-frontend/src/pages/instance/share/use-shared-instance-members.ts
 create mode 100644 apps/app-frontend/src/pages/instance/use-shared-instance-state.ts
 create mode 100644 apps/app-frontend/src/providers/instance-backup.ts
 create mode 100644 apps/app/src/api/reports.rs
 create mode 100644 apps/app/src/api/users.rs
 create mode 100644 apps/frontend/src/components/ui/SharedInstanceInviteOpenInAppModal.vue
 create mode 100644 apps/frontend/src/components/ui/moderation/SharedInstanceReportContext.vue
 create mode 100644 apps/frontend/src/pages/share/[inviteId].vue
 create mode 100644 packages/api-client/src/modules/shared-instances/instances/v1.ts
 create mode 100644 packages/api-client/src/modules/shared-instances/invites/v1.ts
 create mode 100644 packages/api-client/src/modules/shared-instances/moderation/v1.ts
 create mode 100644 packages/api-client/src/modules/shared-instances/types.ts
 create mode 100644 packages/api-client/src/modules/shared-instances/users/v1.ts
 create mode 100644 packages/app-lib/.sqlx/query-0a708a6410e4d7d4cbdb07fa6ea32383be454526177686a0685a988af747db0f.json
 create mode 100644 packages/app-lib/.sqlx/query-2bf4029dd68e983460b8a0b06e1209885ef8e87ad2a8666a9cf1c851a2948cbc.json
 delete mode 100644 packages/app-lib/.sqlx/query-474496fe9b4f0ae920ceef97176dac61544130300cdf2cfc8deb7fbf2efaf8c7.json
 create mode 100644 packages/app-lib/.sqlx/query-6231cfa8f3b21c0fd502e16f823881fd9c44bccaedb9b06585ff8f76146c6e57.json
 rename packages/app-lib/.sqlx/{query-26d23094e9d76e5595d5e5a0cd6bc631c45e6090bf40b26e25024de434fe0281.json => query-6db40d30b3beca48327edfa92dfba2c8b9074904d1012079660de316a20e7dfa.json} (73%)
 create mode 100644 packages/app-lib/.sqlx/query-76988815779ec3c1def6712dcb4156fd72100b0cf97b4ecb11045c6c4f550652.json
 create mode 100644 packages/app-lib/.sqlx/query-88a0520cb21aaea25bf12a5ad07e7f0614e912494f850e77dfc502b1afe7c42a.json
 create mode 100644 packages/app-lib/.sqlx/query-aaf6e6a3de2dd9cb1c9db5dd9de2a6590b89c4f72449fdd34a7f140e2a11bf04.json
 create mode 100644 packages/app-lib/.sqlx/query-b9ce6ff27e3b4d62ff0ae2bed0d00cae0b4b758c0674ac81659ee9d86667f19c.json
 delete mode 100644 packages/app-lib/.sqlx/query-bcc93c48dd3c9ccbe196cfbe27e36b774d1b506e6cf5f2ab38469e9e3e6c9b6d.json
 create mode 100644 packages/app-lib/.sqlx/query-becbba7c6dfb4b22520cc1887718af544c08d3e274a930a68daf3e94e3612243.json
 create mode 100644 packages/app-lib/.sqlx/query-bf813910a5b0db8563a689088eedf95c67b5ceda04aa1b0eb782b581e23ec06b.json
 delete mode 100644 packages/app-lib/.sqlx/query-e53cd252e1e9eebcb3fb9714d7b5ee588e751fdc3f18c48bc4cfd94504c37306.json
 delete mode 100644 packages/app-lib/.sqlx/query-eca3e44d4ba62e218289fa058dd563cebedb6b8add6c936c551a857783645ff8.json
 delete mode 100644 packages/app-lib/.sqlx/query-f0d8d4f98f7fdf3d656a7811f232d429a2cc73bc2c752594fcad7da19967ff7b.json
 create mode 100644 packages/app-lib/migrations/20260630120000_shared-instance-role.sql
 create mode 100644 packages/app-lib/migrations/20260707103000_shared-instance-manager.sql
 create mode 100644 packages/app-lib/migrations/20260707110000_shared-instance-linked-user.sql
 create mode 100644 packages/app-lib/migrations/20260709190000_shared-instance-server-manager.sql
 create mode 100644 packages/app-lib/migrations/20260723120000_quarantined-instances.sql
 create mode 100644 packages/app-lib/src/api/instance/content_set_diff.rs
 create mode 100644 packages/app-lib/src/api/instance/shared/client.rs
 create mode 100644 packages/app-lib/src/api/instance/shared/diff.rs
 create mode 100644 packages/app-lib/src/api/instance/shared/install.rs
 create mode 100644 packages/app-lib/src/api/instance/shared/invites.rs
 create mode 100644 packages/app-lib/src/api/instance/shared/mod.rs
 create mode 100644 packages/app-lib/src/api/instance/shared/publish.rs
 create mode 100644 packages/app-lib/src/api/instance/shared/types.rs
 create mode 100644 packages/app-lib/src/api/reports.rs
 create mode 100644 packages/app-lib/src/api/users.rs
 create mode 100644 packages/app-lib/src/install/shared_instance.rs
 create mode 100644 packages/app-lib/src/state/instances/commands/shared_instance.rs
 create mode 100644 packages/assets/branding/illustrations/invite-bg.webp
 create mode 100644 packages/assets/icons/file-cog.svg
 delete mode 100644 packages/ui/src/components/modal/InstallToPlayModal.vue
 create mode 100644 packages/ui/src/components/sharing/index.ts
 create mode 100644 packages/ui/src/components/sharing/invite-players-modal/index.vue
 create mode 100644 packages/ui/src/components/sharing/invite-players-modal/invite-players-modal-invite-link-editor.vue
 create mode 100644 packages/ui/src/components/sharing/invite-players-modal/invite-players-modal-user-row.vue
 create mode 100644 packages/ui/src/components/sharing/invite-players-modal/types.ts
 create mode 100644 packages/ui/src/components/sharing/invite-players-modal/use-invite-players-search.ts
 create mode 100644 packages/ui/src/layouts/shared/content-tab/components/modals/ConfirmDisableModal.vue
 create mode 100644 packages/ui/src/stories/sharing/InvitePlayersModal.stories.ts

diff --git a/apps/app-frontend/src/App.vue b/apps/app-frontend/src/App.vue
index 90dd210d5..7155f1339 100644
--- a/apps/app-frontend/src/App.vue
+++ b/apps/app-frontend/src/App.vue
@@ -78,14 +78,15 @@ import UnknownPackWarningModal from '@/components/ui/install_flow/UnknownPackWar
 import MinecraftAuthErrorModal from '@/components/ui/minecraft-auth-error-modal/MinecraftAuthErrorModal.vue'
 import MinecraftRequiredModal from '@/components/ui/minecraft-required-modal/MinecraftRequiredModal.vue'
 import AppSettingsModal from '@/components/ui/modal/AppSettingsModal.vue'
-import AuthGrantFlowWaitModal from '@/components/ui/modal/AuthGrantFlowWaitModal.vue'
 import InstallToPlayModal from '@/components/ui/modal/InstallToPlayModal.vue'
 import ModpackAlreadyInstalledModal from '@/components/ui/modal/ModpackAlreadyInstalledModal.vue'
+import ModrinthAccountRequiredModal from '@/components/ui/modal/ModrinthAccountRequiredModal.vue'
 import UpdateToPlayModal from '@/components/ui/modal/UpdateToPlayModal.vue'
 import NavButton from '@/components/ui/NavButton.vue'
 import PrideFundraiserBanner from '@/components/ui/PrideFundraiserBanner.vue'
 import PromotionWrapper from '@/components/ui/PromotionWrapper.vue'
 import QuickInstanceSwitcher from '@/components/ui/QuickInstanceSwitcher.vue'
+import SharedInstanceInviteHandler from '@/components/ui/shared-instances/shared-instance-invite-handler/index.vue'
 import SplashScreen from '@/components/ui/SplashScreen.vue'
 import WindowControls from '@/components/ui/WindowControls.vue'
 import { useCheckDisableMouseover } from '@/composables/macCssFix.js'
@@ -103,8 +104,13 @@ import { check_reachable } from '@/helpers/auth.js'
 import { get_user, get_version } from '@/helpers/cache.js'
 import { command_listener, notification_listener, warning_listener } from '@/helpers/events.js'
 import { install_create_modpack_instance, install_get_modpack_preview } from '@/helpers/install'
-import { list, run } from '@/helpers/instance'
-import { cancelLogin, get as getCreds, login, logout } from '@/helpers/mr_auth.ts'
+import {
+	can_current_user_use_shared_instances,
+	get as getInstance,
+	list,
+	run,
+} from '@/helpers/instance'
+import { get as getCreds, login, logout } from '@/helpers/mr_auth.ts'
 import { mergeUrlQuery, parseModrinthLink } from '@/helpers/project-links.ts'
 import { get as getSettings, set as setSettings } from '@/helpers/settings.ts'
 import { get_opening_command, initialize_state } from '@/helpers/state'
@@ -155,6 +161,7 @@ const APP_SIDEBAR_WIDTH = 300
 const INTERCOM_BUBBLE_DEFAULT_PADDING = 20
 const PRIDE_FUNDRAISER_END_DATE = new Date('2026-07-01T00:00:00Z').getTime()
 const credentials = ref()
+let credentialsRefreshId = 0
 const sidebarToggled = ref(true)
 const unsubscribeSidebarToggle = themeStore.$subscribe(() => {
 	sidebarToggled.value = !themeStore.toggleSidebar
@@ -200,6 +207,7 @@ const tauriApiClient = new TauriModrinthClient({
 	userAgent: async () => `modrinth/theseus/${await appVersion} (support@modrinth.com)`,
 	labrinthBaseUrl: config.labrinthBaseUrl,
 	archonBaseUrl: config.archonBaseUrl,
+	sharedInstancesBaseUrl: config.sharedInstancesBaseUrl,
 	features: [
 		new NodeAuthFeature({
 			getAuth: () => nodeAuthState.getAuth?.() ?? null,
@@ -223,6 +231,16 @@ const { data: authenticatedModrinthUser } = useQuery({
 	enabled: () => !!credentials.value?.session,
 	retry: false,
 })
+useQuery({
+	queryKey: computed(() => ['shared-instance-eligibility', credentials.value?.user?.id]),
+	queryFn: can_current_user_use_shared_instances,
+	enabled: () => !!credentials.value?.session && !!credentials.value?.user?.id,
+	retry: false,
+	staleTime: Infinity,
+	refetchOnMount: false,
+	refetchOnWindowFocus: false,
+	refetchOnReconnect: false,
+})
 const hasPlus = computed(
 	() =>
 		!!credentials.value?.user &&
@@ -735,9 +753,10 @@ const contentInstallModpackAlreadyInstalledModal = ref()
 const addServerToInstanceModal = ref()
 const incompatibilityWarningModal = ref()
 const installToPlayModal = ref()
+const sharedInstanceInviteHandler = ref()
 const updateToPlayModal = ref()
 
-const modrinthLoginFlowWaitModal = ref()
+const modrinthLoginModal = ref()
 
 watch(incompatibilityWarningModal, (modal) => {
 	if (modal) {
@@ -745,8 +764,12 @@ watch(incompatibilityWarningModal, (modal) => {
 	}
 })
 
-setupAuthProvider(credentials, async (_redirectPath) => {
-	await signIn()
+setupAuthProvider(credentials, async (_redirectPath, flow, options) => {
+	if (options?.showModal === false) {
+		await signIn(flow)
+	} else {
+		await requestSignIn(flow)
+	}
 })
 
 async function validateSession(sessionToken) {
@@ -763,23 +786,31 @@ async function validateSession(sessionToken) {
 }
 
 async function fetchCredentials() {
+	const refreshId = ++credentialsRefreshId
+	credentials.value = undefined
+
 	const creds = await getCreds().catch(handleError)
+	if (refreshId !== credentialsRefreshId) return
+
 	if (creds && creds.user_id) {
 		if (creds.session && !(await validateSession(creds.session))) {
+			if (refreshId !== credentialsRefreshId) return
+
 			await logout().catch(handleError)
+			if (refreshId !== credentialsRefreshId) return
+
 			credentials.value = null
 			return
 		}
 		creds.user = await get_user(creds.user_id, 'bypass').catch(handleError)
+		if (refreshId !== credentialsRefreshId) return
 	}
 	credentials.value = creds ?? null
 }
 
-async function signIn() {
-	modrinthLoginFlowWaitModal.value.show()
-
+async function signIn(flow = 'sign-in') {
 	try {
-		await login()
+		await login(flow)
 		await fetchCredentials()
 	} catch (error) {
 		if (
@@ -791,12 +822,26 @@ async function signIn() {
 		} else {
 			handleError(error)
 		}
-	} finally {
-		modrinthLoginFlowWaitModal.value.hide()
 	}
 }
 
+async function requestSignIn(flow = 'sign-in') {
+	await modrinthLoginModal.value?.showSigningIn(flow)
+}
+
+async function requestModrinthAuth(flow = 'sign-in') {
+	await signIn(flow)
+	return !!credentials.value?.session
+}
+
 async function logOut() {
+	await performLogOut()
+}
+
+async function performLogOut() {
+	credentialsRefreshId++
+	credentials.value = undefined
+
 	await logout().catch(handleError)
 	await fetchCredentials()
 }
@@ -917,30 +962,34 @@ function openServerInviteInviterProfile(inviterName) {
 }
 
 async function handleLiveNotification(notification) {
-	if (notification?.body?.type !== 'server_invite' || notification.read) return
-	if (displayedServerInviteNotifications.has(notification.id)) return
+	if (!notification?.body || notification.read) return
+	if (await sharedInstanceInviteHandler.value?.handleNotification(notification)) return
 
-	displayedServerInviteNotifications.add(notification.id)
+	if (notification.body.type === 'server_invite') {
+		if (displayedServerInviteNotifications.has(notification.id)) return
 
-	const serverName =
-		typeof notification.body.server_name === 'string' ? notification.body.server_name : 'a server'
-	const inviterId = notification.body.invited_by
-	const invitedBy =
-		typeof inviterId === 'string' ? await get_user(inviterId, 'bypass').catch(() => null) : null
+		displayedServerInviteNotifications.add(notification.id)
 
-	addPopupNotification({
-		title: serverName,
-		autoCloseMs: null,
-		toast: {
-			type: 'server-invite',
-			actorName: invitedBy?.username ?? null,
-			actorAvatarUrl: invitedBy?.avatar_url ?? null,
-			entityName: serverName,
-			onAccept: () => acceptServerInviteNotification(notification),
-			onDecline: () => declineServerInviteNotification(notification),
-			onOpenActor: () => openServerInviteInviterProfile(invitedBy?.username ?? null),
-		},
-	})
+		const serverName =
+			typeof notification.body.server_name === 'string' ? notification.body.server_name : 'a server'
+		const inviterId = notification.body.invited_by
+		const invitedBy =
+			typeof inviterId === 'string' ? await get_user(inviterId, 'bypass').catch(() => null) : null
+
+		addPopupNotification({
+			title: serverName,
+			autoCloseMs: null,
+			toast: {
+				type: 'server-invite',
+				actorName: invitedBy?.username ?? null,
+				actorAvatarUrl: invitedBy?.avatar_url ?? null,
+				entityName: serverName,
+				onAccept: () => acceptServerInviteNotification(notification),
+				onDecline: () => declineServerInviteNotification(notification),
+				onOpenActor: () => openServerInviteInviterProfile(invitedBy?.username ?? null),
+			},
+		})
+	}
 }
 
 async function handleCommand(e) {
@@ -967,6 +1016,9 @@ async function handleCommand(e) {
 			})
 		}
 	} else if (e.event === 'LaunchInstance') {
+		const instance = await getInstance(e.id).catch(handleError)
+		if (!instance || instance.quarantined) return
+
 		if (e.server) {
 			await start_join_server(e.id, e.server).catch(handleError)
 		} else if (e.singleplayer_world) {
@@ -974,6 +1026,8 @@ async function handleCommand(e) {
 		} else {
 			await run(e.id).catch(handleError)
 		}
+	} else if (e.event === 'InstallSharedInstanceInvite') {
+		await sharedInstanceInviteHandler.value?.installFromInviteId(e.invite_id)
 	} else if (e.event === 'InstallServer') {
 		await router.push(`/project/${e.id}`)
 		await playServerProject(e.id).catch(handleError)
@@ -1498,7 +1552,7 @@ provideAppUpdateDownloadProgress(appUpdateDownload)
 			<AppSettingsModal ref="settingsModal" />
 		</Suspense>
 		<Suspense>
-			<AuthGrantFlowWaitModal ref="modrinthLoginFlowWaitModal" @flow-cancel="cancelLogin" />
+			<ModrinthAccountRequiredModal ref="modrinthLoginModal" :request-auth="requestModrinthAuth" />
 		</Suspense>
 		<CreationFlowModal
 			ref="installationModal"
@@ -1602,7 +1656,11 @@ provideAppUpdateDownloadProgress(appUpdateDownload)
 				</template>
 				<template #sign-out> <LogOutIcon /> Sign out </template>
 			</OverflowMenu>
-			<NavButton v-else v-tooltip.right="'Sign in to a Modrinth account'" :to="() => signIn()">
+			<NavButton
+				v-else
+				v-tooltip.right="'Sign in to a Modrinth account'"
+				:to="() => requestSignIn()"
+			>
 				<LogInIcon class="text-brand" />
 			</NavButton>
 		</div>
@@ -1749,7 +1807,7 @@ provideAppUpdateDownloadProgress(appUpdateDownload)
 					</div>
 					<div class="p-4 border-0 border-b-[1px] border-[--brand-gradient-border] border-solid">
 						<suspense>
-							<FriendsList :credentials="credentials" :sign-in="() => signIn()" />
+							<FriendsList :credentials="credentials" :sign-in="() => requestSignIn()" />
 						</suspense>
 					</div>
 					<PrideFundraiserBanner
@@ -1834,6 +1892,7 @@ provideAppUpdateDownloadProgress(appUpdateDownload)
 		@create-anyway="handleContentInstallModpackDuplicateCreateAnyway"
 		@go-to-instance="handleContentInstallModpackDuplicateGoToInstance"
 	/>
+	<SharedInstanceInviteHandler ref="sharedInstanceInviteHandler" />
 	<InstallToPlayModal ref="installToPlayModal" :show-external-warnings="false" />
 	<UpdateToPlayModal ref="updateToPlayModal" :show-external-warnings="false" />
 </template>
diff --git a/apps/app-frontend/src/components/GridDisplay.vue b/apps/app-frontend/src/components/GridDisplay.vue
index 6b9177ed6..5004b927b 100644
--- a/apps/app-frontend/src/components/GridDisplay.vue
+++ b/apps/app-frontend/src/components/GridDisplay.vue
@@ -65,8 +65,7 @@ async function duplicateInstance(p) {
 const handleRightClick = (event, instanceId) => {
 	const item = instanceComponents.value.find((x) => x.instance.id === instanceId)
 	const baseOptions = [
-		{ name: 'add_content' },
-		{ type: 'divider' },
+		...(item.instance.quarantined ? [] : [{ name: 'add_content' }, { type: 'divider' }]),
 		{ name: 'edit' },
 		{ name: 'duplicate' },
 		{ name: 'open' },
@@ -90,10 +89,14 @@ const handleRightClick = (event, instanceId) => {
 					...baseOptions,
 				]
 			: [
-					{
-						name: 'play',
-						color: 'primary',
-					},
+					...(item.instance.quarantined
+						? []
+						: [
+								{
+									name: 'play',
+									color: 'primary',
+								},
+							]),
 					...baseOptions,
 				],
 	)
diff --git a/apps/app-frontend/src/components/RowDisplay.vue b/apps/app-frontend/src/components/RowDisplay.vue
index 02b1a2a40..982b2ad0b 100644
--- a/apps/app-frontend/src/components/RowDisplay.vue
+++ b/apps/app-frontend/src/components/RowDisplay.vue
@@ -73,8 +73,7 @@ async function duplicateInstance(p) {
 
 const handleInstanceRightClick = async (event, passedInstance) => {
 	const baseOptions = [
-		{ name: 'add_content' },
-		{ type: 'divider' },
+		...(passedInstance.quarantined ? [] : [{ name: 'add_content' }, { type: 'divider' }]),
 		{ name: 'edit' },
 		{ name: 'duplicate' },
 		{ name: 'open_folder' },
@@ -98,10 +97,14 @@ const handleInstanceRightClick = async (event, passedInstance) => {
 					...baseOptions,
 				]
 			: [
-					{
-						name: 'play',
-						color: 'primary',
-					},
+					...(passedInstance.quarantined
+						? []
+						: [
+								{
+									name: 'play',
+									color: 'primary',
+								},
+							]),
 					...baseOptions,
 				]
 
diff --git a/apps/app-frontend/src/components/ui/Instance.vue b/apps/app-frontend/src/components/ui/Instance.vue
index 9fff27fa3..6845a00f2 100644
--- a/apps/app-frontend/src/components/ui/Instance.vue
+++ b/apps/app-frontend/src/components/ui/Instance.vue
@@ -66,6 +66,7 @@ const checkProcess = async () => {
 
 const play = async (e, context) => {
 	e?.stopPropagation()
+	if (props.instance.quarantined) return
 	loading.value = true
 	await run(props.instance.id)
 		.catch((err) => handleSevereError(err, { instanceId: props.instance.id }))
@@ -94,6 +95,7 @@ const stop = async (e, context) => {
 
 const repair = async (e) => {
 	e?.stopPropagation()
+	if (props.instance.quarantined) return
 
 	if (
 		props.instance.install_stage !== 'pack_installed' &&
@@ -116,6 +118,7 @@ const openFolder = async () => {
 }
 
 const addContent = async () => {
+	if (props.instance.quarantined) return
 	await router.push({
 		path: `/browse/${props.instance.loader === 'vanilla' ? 'datapack' : 'mod'}`,
 		query: { i: props.instance.id },
@@ -142,7 +145,9 @@ const unlisten = await process_listener((e) => {
 	}
 })
 
-onMounted(() => checkProcess())
+onMounted(() => {
+	checkProcess()
+})
 onUnmounted(() => unlisten())
 </script>
 
@@ -173,7 +178,11 @@ onUnmounted(() => unlisten())
 						<SpinnerIcon class="animate-spin" />
 					</button>
 				</ButtonStyled>
-				<ButtonStyled v-else :color="first ? 'brand' : 'standard'" circular>
+				<ButtonStyled
+					v-else-if="!instance.quarantined"
+					:color="first ? 'brand' : 'standard'"
+					circular
+				>
 					<button
 						v-tooltip="'Play'"
 						@click="(e) => play(e, 'InstanceCard')"
@@ -227,7 +236,12 @@ onUnmounted(() => unlisten())
 						class="animate-spin w-8 h-8"
 						tabindex="-1"
 					/>
-					<ButtonStyled v-else-if="!installed" size="large" color="brand" circular>
+					<ButtonStyled
+						v-else-if="!installed && !instance.quarantined"
+						size="large"
+						color="brand"
+						circular
+					>
 						<button
 							v-tooltip="'Repair'"
 							class="transition-all scale-75 group-hover:scale-100 group-focus-within:scale-100 origin-bottom opacity-0 group-hover:opacity-100 group-focus-within:opacity-100 card-shadow"
@@ -236,7 +250,7 @@ onUnmounted(() => unlisten())
 							<DownloadIcon />
 						</button>
 					</ButtonStyled>
-					<ButtonStyled v-else size="large" color="brand" circular>
+					<ButtonStyled v-else-if="!instance.quarantined" size="large" color="brand" circular>
 						<button
 							v-tooltip="'Play'"
 							class="transition-all scale-75 group-hover:scale-100 group-focus-within:scale-100 origin-bottom opacity-0 group-hover:opacity-100 group-focus-within:opacity-100 card-shadow"
diff --git a/apps/app-frontend/src/components/ui/friends/FriendsList.vue b/apps/app-frontend/src/components/ui/friends/FriendsList.vue
index c622c078e..71c8c1c8f 100644
--- a/apps/app-frontend/src/components/ui/friends/FriendsList.vue
+++ b/apps/app-frontend/src/components/ui/friends/FriendsList.vue
@@ -10,18 +10,12 @@ import {
 	useRelativeTime,
 	useVIntl,
 } from '@modrinth/ui'
-import { computed, onUnmounted, ref, watch } from 'vue'
+import { computed, ref } from 'vue'
 
 import FriendsSection from '@/components/ui/friends/FriendsSection.vue'
 import ModalWrapper from '@/components/ui/modal/ModalWrapper.vue'
-import { friend_listener } from '@/helpers/events'
-import {
-	add_friend,
-	friends,
-	type FriendWithUserData,
-	remove_friend,
-	transformFriends,
-} from '@/helpers/friends.ts'
+import { useFriends } from '@/composables/use-friends'
+import type { FriendWithUserData } from '@/helpers/friends.ts'
 import type { ModrinthCredentials } from '@/helpers/mr_auth'
 
 const { formatMessage } = useVIntl()
@@ -35,36 +29,23 @@ const props = defineProps<{
 }>()
 
 const userCredentials = computed(() => props.credentials)
+const {
+	friends: userFriends,
+	loading,
+	requestFriend,
+	acceptFriend,
+	removeFriend: removeFriendRecord,
+} = useFriends({
+	currentUserId: () => userCredentials.value?.user_id,
+	getCredentials: () => userCredentials.value,
+	onError: handleError,
+})
 
 const search = ref('')
 const friendInvitesModal = ref()
-
 const username = ref('')
 const addFriendModal = ref()
-async function addFriendFromModal() {
-	addFriendModal.value.hide()
-	await add_friend(username.value).catch(handleError)
-	username.value = ''
-	await loadFriends()
-}
 
-async function addFriend(friend: FriendWithUserData) {
-	const id = friend.id === userCredentials.value?.user_id ? friend.friend_id : friend.id
-	if (id) {
-		await add_friend(id).catch(handleError)
-		await loadFriends()
-	}
-}
-
-async function removeFriend(friend: FriendWithUserData) {
-	const id = friend.id === userCredentials.value?.user_id ? friend.friend_id : friend.id
-	if (id) {
-		await remove_friend(id).catch(handleError)
-		await loadFriends()
-	}
-}
-
-const userFriends = ref<FriendWithUserData[]>([])
 const sortedFriends = computed<FriendWithUserData[]>(() =>
 	userFriends.value.slice().sort((a, b) => {
 		if (a.last_updated === null && b.last_updated === null) {
@@ -108,42 +89,22 @@ const incomingRequests = computed(() =>
 		.sort((a, b) => b.created.diff(a.created)),
 )
 
-const loading = ref(true)
-async function loadFriends(timeout = false) {
-	loading.value = timeout
+function addFriendFromModal() {
+	const target = username.value.trim()
+	if (!target) return
 
-	try {
-		const friendsList = await friends()
-		userFriends.value = await transformFriends(friendsList, userCredentials.value)
-		loading.value = false
-	} catch (e) {
-		console.error('Error loading friends', e)
-		if (timeout) {
-			setTimeout(() => loadFriends(), 15 * 1000)
-		}
-	}
+	addFriendModal.value.hide()
+	requestFriend({ id: target, username: target })
+	username.value = ''
 }
 
-watch(
-	userCredentials,
-	() => {
-		if (userCredentials.value === undefined) {
-			userFriends.value = []
-			loading.value = false
-		} else if (userCredentials.value === null) {
-			userFriends.value = []
-			loading.value = false
-		} else {
-			loadFriends(true)
-		}
-	},
-	{ immediate: true },
-)
+function addFriend(friend: FriendWithUserData) {
+	acceptFriend(friend)
+}
 
-const unlisten = await friend_listener(() => loadFriends())
-onUnmounted(() => {
-	unlisten()
-})
+function removeFriend(friend: FriendWithUserData) {
+	removeFriendRecord(friend)
+}
 
 const messages = defineMessages({
 	addFriend: {
diff --git a/apps/app-frontend/src/components/ui/instance-page-header/index.vue b/apps/app-frontend/src/components/ui/instance-page-header/index.vue
index 68591e0e3..872db1ae5 100644
--- a/apps/app-frontend/src/components/ui/instance-page-header/index.vue
+++ b/apps/app-frontend/src/components/ui/instance-page-header/index.vue
@@ -4,23 +4,57 @@
 			<Avatar :src="iconSrc" :alt="instance.name" size="64px" :tint-by="instance.id" />
 		</template>
 
+		<template v-if="instance.shared_instance || instance.quarantined" #badges>
+			<PageHeaderBadgeItem
+				v-if="instance.quarantined"
+				:icon="LockIcon"
+				aria-label="Locked instance information"
+				class="!border-orange !bg-highlight-orange !text-orange"
+			>
+				Locked
+			</PageHeaderBadgeItem>
+			<PageHeaderBadgeItem
+				v-else
+				:icon="UnknownIcon"
+				:tooltip="sharedInstanceTooltip"
+				aria-label="Shared instance information"
+				class="!border-blue !bg-highlight-blue !text-blue"
+			>
+				Shared
+			</PageHeaderBadgeItem>
+		</template>
+
 		<template #metadata>
-			<InstanceHeaderServerMetadata
-				v-if="isServerInstance"
-				:loading-server-ping="loadingServerPing"
-				:players-online="playersOnline"
-				:status-online="statusOnline"
-				:recent-plays="recentPlays"
-				:ping="ping"
-				:minecraft-server="minecraftServer"
-				:linked-project-v3="linkedProjectV3"
-				:instance-id="instance.id"
-			/>
+			<div v-if="isServerInstance" class="flex flex-wrap items-center gap-2">
+				<InstanceHeaderServerMetadata
+					:loading-server-ping="loadingServerPing"
+					:players-online="playersOnline"
+					:status-online="statusOnline"
+					:recent-plays="recentPlays"
+					:ping="ping"
+					:minecraft-server="minecraftServer"
+					:linked-project-v3="linkedProjectV3"
+					:instance-id="instance.id"
+				/>
+				<PageHeaderMetadataItem v-if="sharedInstanceManager" :action="sharedInstanceManagerAction">
+					{{ sharedInstanceManagerLabel }}
+					<Avatar
+						:src="sharedInstanceManager.avatarUrl"
+						:alt="sharedInstanceManager.name"
+						:tint-by="sharedInstanceManager.tintBy"
+						size="24px"
+						:circle="sharedInstanceManager.type === 'user'"
+						no-shadow
+					/>
+					<span class="min-w-0 truncate">{{ sharedInstanceManager.name }}</span>
+				</PageHeaderMetadataItem>
+			</div>
 			<PageHeaderMetadata v-else>
 				<PageHeaderMetadataItem :icon="Gamepad2Icon" tooltip="Minecraft version">
 					Minecraft {{ instance.game_version }}
 				</PageHeaderMetadataItem>
 				<PageHeaderMetadataItem
+					v-if="sharedInstanceManager?.type !== 'user'"
 					:icon="ServerLoaderIcon"
 					:icon-props="{ loader: loaderDisplayName }"
 					tooltip="Mod loader"
@@ -34,6 +68,18 @@
 				>
 					{{ playtimeLabel }}
 				</PageHeaderMetadataItem>
+				<PageHeaderMetadataItem v-if="sharedInstanceManager" :action="sharedInstanceManagerAction">
+					{{ sharedInstanceManagerLabel }}
+					<Avatar
+						:src="sharedInstanceManager.avatarUrl"
+						:alt="sharedInstanceManager.name"
+						:tint-by="sharedInstanceManager.tintBy"
+						size="24px"
+						:circle="sharedInstanceManager.type === 'user'"
+						no-shadow
+					/>
+					<span class="min-w-0 truncate">{{ sharedInstanceManager.name }}</span>
+				</PageHeaderMetadataItem>
 			</PageHeaderMetadata>
 		</template>
 
@@ -44,12 +90,6 @@
 						{{ formatMessage(commonMessages.installingLabel) }}
 					</button>
 				</ButtonStyled>
-				<ButtonStyled v-else-if="instance.install_stage !== 'installed'" color="brand" size="large">
-					<button type="button" @click="emit('repair')">
-						<DownloadIcon />
-						{{ formatMessage(messages.repair) }}
-					</button>
-				</ButtonStyled>
 				<ButtonStyled v-else-if="playing" color="red" size="large">
 					<button type="button" :disabled="stopping" @click="emit('stop')">
 						<StopCircleIcon />
@@ -58,6 +98,18 @@
 						}}
 					</button>
 				</ButtonStyled>
+				<ButtonStyled v-else-if="instance.quarantined" color="brand" size="large">
+					<button v-tooltip="formatMessage(messages.lockedPlayTooltip)" type="button" disabled>
+						<PlayIcon />
+						{{ formatMessage(commonMessages.playButton) }}
+					</button>
+				</ButtonStyled>
+				<ButtonStyled v-else-if="instance.install_stage !== 'installed'" color="brand" size="large">
+					<button type="button" @click="emit('repair')">
+						<DownloadIcon />
+						{{ formatMessage(messages.repair) }}
+					</button>
+				</ButtonStyled>
 				<JoinedButtons
 					v-else-if="!loading && isServerInstance"
 					:actions="serverPlayActions"
@@ -104,13 +156,16 @@ import {
 	DownloadIcon,
 	ExternalIcon,
 	FolderOpenIcon,
+	LockIcon,
 	MoreVerticalIcon,
 	PackageIcon,
 	PlayIcon,
+	ReportIcon,
 	SettingsIcon,
 	StopCircleIcon,
 	TagCategoryGamepad2Icon as Gamepad2Icon,
 	TimerIcon,
+	UnknownIcon,
 } from '@modrinth/assets'
 import {
 	Avatar,
@@ -123,6 +178,7 @@ import {
 	LoaderIcon as ServerLoaderIcon,
 	PageHeader,
 	PageHeaderActions,
+	PageHeaderBadgeItem,
 	PageHeaderMetadata,
 	PageHeaderMetadataItem,
 	type ServerLoader,
@@ -130,6 +186,7 @@ import {
 	type TeleportOverflowMenuItem,
 	useVIntl,
 } from '@modrinth/ui'
+import { openUrl } from '@tauri-apps/plugin-opener'
 import { computed } from 'vue'
 
 import type { GameInstance } from '@/helpers/types'
@@ -169,6 +226,10 @@ const messages = defineMessages({
 		id: 'instance.action.repair',
 		defaultMessage: 'Repair',
 	},
+	lockedPlayTooltip: {
+		id: 'instance.locked.play-tooltip',
+		defaultMessage: 'This instance has been locked',
+	},
 	starting: {
 		id: 'instance.action.starting',
 		defaultMessage: 'Starting...',
@@ -177,6 +238,14 @@ const messages = defineMessages({
 		id: 'instance.action.stopping',
 		defaultMessage: 'Stopping...',
 	},
+	sharedInstanceTooltip: {
+		id: 'instance.shared-instance.tooltip',
+		defaultMessage: "This instance's content is being managed by someone else.",
+	},
+	sharedInstanceOwnerTooltip: {
+		id: 'instance.shared-instance.owner-tooltip',
+		defaultMessage: "This instance's content is being shared to other users.",
+	},
 })
 
 const props = withDefaults(
@@ -196,6 +265,12 @@ const props = withDefaults(
 		ping?: number
 		minecraftServer?: Labrinth.Projects.v3.Project['minecraft_server']
 		linkedProjectV3?: Labrinth.Projects.v3.Project
+		sharedInstanceManager?: {
+			type: 'user' | 'server'
+			name: string
+			avatarUrl?: string
+			tintBy: string
+		} | null
 	}>(),
 	{
 		iconSrc: null,
@@ -212,6 +287,7 @@ const props = withDefaults(
 		ping: undefined,
 		minecraftServer: undefined,
 		linkedProjectV3: undefined,
+		sharedInstanceManager: null,
 	},
 )
 
@@ -224,6 +300,7 @@ const emit = defineEmits<{
 	openFolder: []
 	export: []
 	createShortcut: []
+	report: [event?: MouseEvent]
 }>()
 
 const installingStages = [
@@ -241,6 +318,21 @@ const loaderDisplayName = computed(() => formatLoaderLabel(props.instance.loader
 const loaderLabel = computed(() =>
 	[loaderDisplayName.value, props.instance.loader_version].filter(Boolean).join(' '),
 )
+const sharedInstanceTooltip = computed(() =>
+	formatMessage(
+		props.instance.shared_instance?.role === 'owner'
+			? messages.sharedInstanceOwnerTooltip
+			: messages.sharedInstanceTooltip,
+	),
+)
+const sharedInstanceManagerLabel = computed(() =>
+	props.sharedInstanceManager?.type === 'server' ? 'Linked to' : 'Managed by',
+)
+const sharedInstanceManagerAction = computed(() => {
+	const manager = props.sharedInstanceManager
+	if (manager?.type !== 'user') return undefined
+	return () => openUrl(`https://modrinth.com/user/${encodeURIComponent(manager.name)}`)
+})
 const playtimeLabel = computed(() => {
 	if (props.timePlayed <= 0) return formatMessage(messages.neverPlayed)
 
@@ -271,24 +363,46 @@ const serverPlayActions = computed<JoinedButtonAction[]>(() => [
 		action: () => emit('play'),
 	},
 ])
-const moreActions = computed<TeleportOverflowMenuItem[]>(() => [
-	{
-		id: 'open-folder',
-		label: formatMessage(messages.openFolder),
-		icon: FolderOpenIcon,
-		action: () => emit('openFolder'),
-	},
-	{
-		id: 'export-mrpack',
-		label: formatMessage(messages.exportModpack),
-		icon: PackageIcon,
-		action: () => emit('export'),
-	},
-	{
-		id: 'create-shortcut',
-		label: formatMessage(messages.createShortcut),
-		icon: ExternalIcon,
-		action: () => emit('createShortcut'),
-	},
-])
+const moreActions = computed<TeleportOverflowMenuItem[]>(() => {
+	const actions: TeleportOverflowMenuItem[] = [
+		{
+			id: 'open-folder',
+			label: formatMessage(messages.openFolder),
+			icon: FolderOpenIcon,
+			action: () => emit('openFolder'),
+		},
+	]
+
+	if (!props.instance.quarantined) {
+		actions.push(
+			{
+				id: 'export-mrpack',
+				label: formatMessage(messages.exportModpack),
+				icon: PackageIcon,
+				action: () => emit('export'),
+			},
+			{
+				id: 'create-shortcut',
+				label: formatMessage(messages.createShortcut),
+				icon: ExternalIcon,
+				action: () => emit('createShortcut'),
+			},
+		)
+	}
+
+	if (props.instance.shared_instance?.role === 'member') {
+		actions.push(
+			{ divider: true },
+			{
+				id: 'report-shared-instance',
+				label: formatMessage(commonMessages.reportButton),
+				icon: ReportIcon,
+				color: 'red',
+				action: (event) => emit('report', event),
+			},
+		)
+	}
+
+	return actions
+})
 </script>
diff --git a/apps/app-frontend/src/components/ui/instance/instance-admonitions/index.vue b/apps/app-frontend/src/components/ui/instance/instance-admonitions/index.vue
new file mode 100644
index 000000000..4d73ef688
--- /dev/null
+++ b/apps/app-frontend/src/components/ui/instance/instance-admonitions/index.vue
@@ -0,0 +1,116 @@
+<template>
+	<StackedAdmonitions v-bind="$attrs" :items="stackItems" class="w-full">
+		<template #item="{ item, dismissible }">
+			<InstanceAdmonitionsSharedInstanceStale
+				v-if="item.kind === 'shared-instance-stale'"
+				:instance="instance"
+				@published="emit('published')"
+			/>
+			<InstanceAdmonitionsSharedInstanceWrongAccount
+				v-else-if="item.kind === 'shared-instance-wrong-account'"
+				:expected-user-id="sharedInstanceExpectedUserId"
+				:role="sharedInstanceRole"
+				:signed-out="sharedInstanceSignedOut"
+			/>
+			<InstanceAdmonitionsSharedInstanceUnavailable
+				v-else-if="item.kind === 'shared-instance-unavailable'"
+				:reason="displayedSharedInstanceUnavailableReason"
+				:manager="sharedInstanceUnavailableManager"
+				:dismissible="dismissible"
+				@dismiss="sharedInstanceUnavailableDismissed = true"
+				@delete="emit('delete')"
+			/>
+		</template>
+	</StackedAdmonitions>
+</template>
+
+<script setup lang="ts">
+import { StackedAdmonitions } from '@modrinth/ui'
+import { computed, ref, watch } from 'vue'
+
+import type { SharedInstanceUnavailableReason } from '@/helpers/install'
+import type { GameInstance } from '@/helpers/types'
+
+import InstanceAdmonitionsSharedInstanceStale from './instance-admonitions-shared-instance-stale.vue'
+import InstanceAdmonitionsSharedInstanceUnavailable from './instance-admonitions-shared-instance-unavailable.vue'
+import InstanceAdmonitionsSharedInstanceWrongAccount from './instance-admonitions-shared-instance-wrong-account.vue'
+import type { InstanceAdmonitionItem, SharedInstanceRole } from './types'
+
+defineOptions({
+	inheritAttrs: false,
+})
+
+const props = defineProps<{
+	instance: GameInstance
+	sharedInstanceUnavailableReason?: SharedInstanceUnavailableReason | null
+	sharedInstanceUnavailableManager?: string | null
+	sharedInstanceWrongAccount?: boolean
+	sharedInstanceExpectedUserId?: string | null
+	sharedInstanceRole?: SharedInstanceRole | null
+	sharedInstanceSignedOut?: boolean
+}>()
+
+const emit = defineEmits<{
+	published: []
+	delete: []
+}>()
+
+const sharedInstanceWrongAccount = computed(() => props.sharedInstanceWrongAccount ?? false)
+const displayedSharedInstanceUnavailableReason = computed<SharedInstanceUnavailableReason | null>(
+	() =>
+		props.instance.quarantined ? 'quarantined' : (props.sharedInstanceUnavailableReason ?? null),
+)
+const sharedInstanceUnavailableDismissed = ref(false)
+const showSharedInstancePublishAdmonition = computed(
+	() =>
+		!sharedInstanceWrongAccount.value &&
+		props.instance.install_stage === 'installed' &&
+		props.instance.shared_instance?.role === 'owner' &&
+		props.instance.shared_instance.status === 'stale',
+)
+
+const stackItems = computed<InstanceAdmonitionItem[]>(() => {
+	const items: InstanceAdmonitionItem[] = []
+
+	if (sharedInstanceWrongAccount.value) {
+		items.push({
+			id: 'shared-instance-wrong-account',
+			type: 'warning',
+			dismissible: false,
+			kind: 'shared-instance-wrong-account',
+		})
+	}
+
+	const unavailableReason = displayedSharedInstanceUnavailableReason.value
+	const sharedInstanceQuarantined = unavailableReason === 'quarantined'
+	if (
+		unavailableReason &&
+		(sharedInstanceQuarantined || !sharedInstanceUnavailableDismissed.value)
+	) {
+		items.push({
+			id: 'shared-instance-unavailable',
+			type: 'warning',
+			dismissible: !sharedInstanceQuarantined,
+			kind: 'shared-instance-unavailable',
+		})
+	}
+
+	if (showSharedInstancePublishAdmonition.value) {
+		items.push({
+			id: 'shared-instance-stale',
+			type: 'warning',
+			dismissible: false,
+			kind: 'shared-instance-stale',
+		})
+	}
+
+	return items
+})
+
+watch(
+	() => [props.instance.id, displayedSharedInstanceUnavailableReason.value],
+	() => {
+		sharedInstanceUnavailableDismissed.value = false
+	},
+)
+</script>
diff --git a/apps/app-frontend/src/components/ui/instance/instance-admonitions/instance-admonitions-messages.ts b/apps/app-frontend/src/components/ui/instance/instance-admonitions/instance-admonitions-messages.ts
new file mode 100644
index 000000000..5191ae9b2
--- /dev/null
+++ b/apps/app-frontend/src/components/ui/instance/instance-admonitions/instance-admonitions-messages.ts
@@ -0,0 +1,69 @@
+import { defineMessages } from '@modrinth/ui'
+
+export const instanceAdmonitionsMessages = defineMessages({
+	sharedInstanceChangesHeader: {
+		id: 'app.instance.admonitions.shared-instance.changes-header',
+		defaultMessage: "Your changes haven't been shared yet",
+	},
+	sharedInstanceChangesBody: {
+		id: 'app.instance.admonitions.shared-instance.changes-body',
+		defaultMessage: "Your local instance is ahead of the users you've shared it with.",
+	},
+	sharedInstancePublishButton: {
+		id: 'app.instance.admonitions.shared-instance.publish-button',
+		defaultMessage: 'Push update',
+	},
+	sharedInstancePublishingButton: {
+		id: 'app.instance.admonitions.shared-instance.publishing-button',
+		defaultMessage: 'Pushing...',
+	},
+	sharedInstanceReviewingButton: {
+		id: 'app.instance.admonitions.shared-instance.reviewing-button',
+		defaultMessage: 'Reviewing...',
+	},
+	sharedInstanceReviewHeader: {
+		id: 'app.instance.admonitions.shared-instance.review-header',
+		defaultMessage: 'Review changes',
+	},
+	sharedInstanceReviewAdmonitionHeader: {
+		id: 'app.instance.admonitions.shared-instance.review-admonition-header',
+		defaultMessage: 'Push update',
+	},
+	sharedInstanceReviewDescription: {
+		id: 'app.instance.admonitions.shared-instance.review-description',
+		defaultMessage:
+			'Review the content changes that will be shared with everyone using this instance.',
+	},
+	sharedInstanceAddedLabel: {
+		id: 'app.instance.admonitions.shared-instance.added-label',
+		defaultMessage: 'Added',
+	},
+	sharedInstanceRemovedLabel: {
+		id: 'app.instance.admonitions.shared-instance.removed-label',
+		defaultMessage: 'Removed',
+	},
+	sharedInstanceWrongAccountHeader: {
+		id: 'app.instance.shared-instance-wrong-account.warning-header',
+		defaultMessage: 'You are using the wrong Modrinth account',
+	},
+	sharedInstanceSignedOutHeader: {
+		id: 'app.instance.shared-instance-wrong-account.signed-out-header',
+		defaultMessage: 'You need to sign in to Modrinth',
+	},
+	sharedInstanceWrongAccountSignInAs: {
+		id: 'app.instance.shared-instance-wrong-account.sign-in-as-label',
+		defaultMessage: 'Sign in as',
+	},
+	sharedInstanceWrongAccountUserBody: {
+		id: 'app.instance.shared-instance-wrong-account.user-admonition-body-v2',
+		defaultMessage: 'to receive updates for this shared instance.',
+	},
+	sharedInstanceWrongAccountOwnerBody: {
+		id: 'app.instance.shared-instance-wrong-account.owner-admonition-body-v2',
+		defaultMessage: "to manage this shared instance. You won't be able to push updates to users.",
+	},
+	sharedInstanceWrongAccountFallbackUsername: {
+		id: 'app.instance.shared-instance-wrong-account.fallback-username',
+		defaultMessage: 'the linked account',
+	},
+})
diff --git a/apps/app-frontend/src/components/ui/instance/instance-admonitions/instance-admonitions-shared-instance-stale.vue b/apps/app-frontend/src/components/ui/instance/instance-admonitions/instance-admonitions-shared-instance-stale.vue
new file mode 100644
index 000000000..e437bfe1c
--- /dev/null
+++ b/apps/app-frontend/src/components/ui/instance/instance-admonitions/instance-admonitions-shared-instance-stale.vue
@@ -0,0 +1,66 @@
+<template>
+	<Admonition
+		type="info"
+		inline-actions
+		:header="formatMessage(messages.sharedInstanceChangesHeader)"
+	>
+		{{ formatMessage(messages.sharedInstanceChangesBody) }}
+		<template #actions>
+			<ButtonStyled color="blue">
+				<button class="!h-10" :disabled="isPublishButtonDisabled" @click="reviewChanges">
+					<SpinnerIcon
+						v-if="isReviewingPublish || isPublishing"
+						class="animate-spin"
+						aria-hidden="true"
+					/>
+					<UploadIcon v-else aria-hidden="true" />
+					{{
+						isPublishing
+							? formatMessage(messages.sharedInstancePublishingButton)
+							: isReviewingPublish
+								? formatMessage(messages.sharedInstanceReviewingButton)
+								: formatMessage(messages.sharedInstancePublishButton)
+					}}
+				</button>
+			</ButtonStyled>
+		</template>
+	</Admonition>
+
+	<SharedInstancePublishModal
+		ref="publishModal"
+		:instance="instance"
+		@published="emit('published')"
+		@state-change="publishState = $event"
+	/>
+</template>
+
+<script setup lang="ts">
+import { SpinnerIcon, UploadIcon } from '@modrinth/assets'
+import { Admonition, ButtonStyled, useVIntl } from '@modrinth/ui'
+import { computed, ref } from 'vue'
+
+import SharedInstancePublishModal from '@/components/ui/shared-instances/SharedInstancePublishModal.vue'
+import type { GameInstance } from '@/helpers/types'
+
+import { instanceAdmonitionsMessages as messages } from './instance-admonitions-messages'
+
+defineProps<{
+	instance: GameInstance
+}>()
+
+const emit = defineEmits<{
+	published: []
+}>()
+
+const { formatMessage } = useVIntl()
+const publishModal = ref<InstanceType<typeof SharedInstancePublishModal>>()
+const publishState = ref<'idle' | 'reviewing' | 'publishing'>('idle')
+const isPublishing = computed(() => publishState.value === 'publishing')
+const isReviewingPublish = computed(() => publishState.value === 'reviewing')
+
+const isPublishButtonDisabled = computed(() => isPublishing.value || isReviewingPublish.value)
+
+function reviewChanges(e?: MouseEvent) {
+	publishModal.value?.show(e)
+}
+</script>
diff --git a/apps/app-frontend/src/components/ui/instance/instance-admonitions/instance-admonitions-shared-instance-unavailable.vue b/apps/app-frontend/src/components/ui/instance/instance-admonitions/instance-admonitions-shared-instance-unavailable.vue
new file mode 100644
index 000000000..88dc3b715
--- /dev/null
+++ b/apps/app-frontend/src/components/ui/instance/instance-admonitions/instance-admonitions-shared-instance-unavailable.vue
@@ -0,0 +1,51 @@
+<template>
+	<Admonition
+		type="warning"
+		:inline-actions="reason === 'quarantined'"
+		:header="formatMessage(sharedInstanceUnavailableTitleMessage(reason ?? null))"
+		:dismissible="dismissible"
+		@dismiss="emit('dismiss')"
+	>
+		{{ formatSharedInstanceUnavailable(reason ?? null, manager) }}
+		<template v-if="reason === 'quarantined'" #actions>
+			<ButtonStyled color="orange">
+				<button class="!h-10" @click="emit('delete')">
+					<TrashIcon aria-hidden="true" />
+					{{ formatMessage(messages.deleteInstance) }}
+				</button>
+			</ButtonStyled>
+		</template>
+	</Admonition>
+</template>
+
+<script setup lang="ts">
+import { TrashIcon } from '@modrinth/assets'
+import { Admonition, ButtonStyled, defineMessages, useVIntl } from '@modrinth/ui'
+
+import type { SharedInstanceUnavailableReason } from '@/helpers/install'
+import {
+	sharedInstanceUnavailableTitleMessage,
+	useSharedInstanceErrors,
+} from '@/helpers/shared-instance-errors'
+
+defineProps<{
+	reason?: SharedInstanceUnavailableReason | null
+	manager?: string | null
+	dismissible?: boolean
+}>()
+
+const emit = defineEmits<{
+	dismiss: []
+	delete: []
+}>()
+
+const { formatMessage } = useVIntl()
+const { formatSharedInstanceUnavailable } = useSharedInstanceErrors()
+
+const messages = defineMessages({
+	deleteInstance: {
+		id: 'instance.locked.delete-button',
+		defaultMessage: 'Delete instance',
+	},
+})
+</script>
diff --git a/apps/app-frontend/src/components/ui/instance/instance-admonitions/instance-admonitions-shared-instance-wrong-account.vue b/apps/app-frontend/src/components/ui/instance/instance-admonitions/instance-admonitions-shared-instance-wrong-account.vue
new file mode 100644
index 000000000..aab1f2fa8
--- /dev/null
+++ b/apps/app-frontend/src/components/ui/instance/instance-admonitions/instance-admonitions-shared-instance-wrong-account.vue
@@ -0,0 +1,78 @@
+<template>
+	<Admonition type="warning" :header="formatMessage(headerMessage)">
+		<span class="flex flex-wrap items-center gap-x-1.5 gap-y-1">
+			<span>{{ formatMessage(messages.sharedInstanceWrongAccountSignInAs) }}</span>
+			<span
+				v-if="sharedInstanceExpectedUser"
+				class="inline-flex max-w-full min-w-0 items-center gap-1.5 align-middle font-semibold text-contrast"
+			>
+				<Avatar
+					:src="sharedInstanceExpectedUser.avatarUrl"
+					:alt="sharedInstanceExpectedUsername"
+					:tint-by="sharedInstanceExpectedUser.tintBy"
+					size="20px"
+					circle
+					no-shadow
+				/>
+				<span class="min-w-0 truncate">{{ sharedInstanceExpectedUsername }}</span>
+			</span>
+			<span v-else class="font-semibold">{{ sharedInstanceExpectedUsername }}</span>
+			<span>{{ formatMessage(bodyMessage) }}</span>
+		</span>
+	</Admonition>
+</template>
+
+<script setup lang="ts">
+import { Admonition, Avatar, useVIntl } from '@modrinth/ui'
+import { useQuery } from '@tanstack/vue-query'
+import { computed } from 'vue'
+
+import { get_user } from '@/helpers/cache'
+
+import { instanceAdmonitionsMessages as messages } from './instance-admonitions-messages'
+import type { SharedInstanceRole } from './types'
+
+const props = defineProps<{
+	expectedUserId?: string | null
+	role?: SharedInstanceRole | null
+	signedOut?: boolean
+}>()
+
+const { formatMessage } = useVIntl()
+const expectedUserId = computed(() => props.expectedUserId ?? null)
+const expectedUserQuery = useQuery({
+	queryKey: computed(() => ['user', expectedUserId.value]),
+	queryFn: async () => {
+		if (!expectedUserId.value) return null
+
+		return await get_user(expectedUserId.value, 'bypass').catch(() => null)
+	},
+	enabled: () => !!expectedUserId.value,
+	staleTime: 30_000,
+})
+const sharedInstanceExpectedUser = computed(() => {
+	const user = expectedUserQuery.data.value
+	if (!user) return null
+
+	return {
+		username: user.username,
+		avatarUrl: user.avatar_url ?? undefined,
+		tintBy: user.id,
+	}
+})
+const sharedInstanceExpectedUsername = computed(
+	() =>
+		sharedInstanceExpectedUser.value?.username ||
+		formatMessage(messages.sharedInstanceWrongAccountFallbackUsername),
+)
+const headerMessage = computed(() =>
+	props.signedOut
+		? messages.sharedInstanceSignedOutHeader
+		: messages.sharedInstanceWrongAccountHeader,
+)
+const bodyMessage = computed(() =>
+	props.role === 'owner'
+		? messages.sharedInstanceWrongAccountOwnerBody
+		: messages.sharedInstanceWrongAccountUserBody,
+)
+</script>
diff --git a/apps/app-frontend/src/components/ui/instance/instance-admonitions/types.ts b/apps/app-frontend/src/components/ui/instance/instance-admonitions/types.ts
new file mode 100644
index 000000000..ea7eb81be
--- /dev/null
+++ b/apps/app-frontend/src/components/ui/instance/instance-admonitions/types.ts
@@ -0,0 +1,12 @@
+import type { StackedAdmonitionItem } from '@modrinth/ui'
+
+export type InstanceAdmonitionKind =
+	| 'shared-instance-stale'
+	| 'shared-instance-unavailable'
+	| 'shared-instance-wrong-account'
+
+export type InstanceAdmonitionItem = StackedAdmonitionItem & {
+	kind: InstanceAdmonitionKind
+}
+
+export type SharedInstanceRole = 'owner' | 'member'
diff --git a/apps/app-frontend/src/components/ui/instance_settings/InstallationSettings.vue b/apps/app-frontend/src/components/ui/instance_settings/InstallationSettings.vue
index fa1a4d031..fe210e165 100644
--- a/apps/app-frontend/src/components/ui/instance_settings/InstallationSettings.vue
+++ b/apps/app-frontend/src/components/ui/instance_settings/InstallationSettings.vue
@@ -7,7 +7,6 @@ import {
 	injectFilePicker,
 	injectNotificationManager,
 	InstallationSettingsLayout,
-	provideAppBackup,
 	provideInstallationSettings,
 	useDebugLogger,
 	useVIntl,
@@ -16,24 +15,25 @@ import type { GameVersionTag, PlatformTag } from '@modrinth/utils'
 import { useQuery, useQueryClient } from '@tanstack/vue-query'
 import { computed, ref } from 'vue'
 
+import SharedInstanceInstallationSettingsControls from '@/components/ui/shared-instances/SharedInstanceInstallationSettingsControls.vue'
+import { useManagedContentPolicy } from '@/composables/instances/use-managed-content-policy'
 import { trackEvent } from '@/helpers/analytics'
 import { get_project_versions, get_version } from '@/helpers/cache'
 import {
-	install_duplicate_instance,
 	install_existing_instance,
 	install_pack_to_existing_instance,
-	installJobInstanceId,
 	wait_for_install_job,
 } from '@/helpers/install'
 import {
 	edit,
 	get_linked_modpack_info,
-	list,
+	unlink_shared_instance,
 	update_managed_modrinth_version,
 	update_repair_modrinth,
 } from '@/helpers/instance'
 import { get_loader_versions } from '@/helpers/metadata'
 import { get_game_versions, get_loaders } from '@/helpers/tags'
+import { provideInstanceBackup } from '@/providers/instance-backup'
 import { injectInstanceSettings } from '@/providers/instance-settings'
 import { useTheming } from '@/store/state'
 
@@ -47,6 +47,7 @@ const debug = useDebugLogger('AppInstallationSettings')
 const themeStore = useTheming()
 
 const { instance, offline, isMinecraftServer, onUnlinked, closeModal } = injectInstanceSettings()
+const managedContentPolicy = useManagedContentPolicy(instance)
 const skipNonEssentialWarnings = computed(() =>
 	themeStore.getFeatureFlag('skip_non_essential_warnings'),
 )
@@ -111,9 +112,14 @@ debug('metadata queries configured', {
 const isModrinthLinkedModpack = computed(
 	() =>
 		instance.value.link?.type === 'modrinth_modpack' ||
-		instance.value.link?.type === 'server_project_modpack',
+		instance.value.link?.type === 'server_project_modpack' ||
+		(instance.value.link?.type === 'shared_instance' &&
+			!!instance.value.link.modpack_project_id &&
+			!!instance.value.link.modpack_version_id),
 )
 const isImportedModpack = computed(() => instance.value.link?.type === 'imported_modpack')
+const isSharedInstanceManagedModpack = managedContentPolicy.isManagedModpack
+const canUnlinkSharedInstance = managedContentPolicy.canUnlink
 
 const modpackInfoQuery = useQuery({
 	queryKey: computed(() => ['linkedModpackInfo', instance.value.id]),
@@ -124,12 +130,43 @@ const modpackInfo = modpackInfoQuery.data
 
 const repairing = ref(false)
 const reinstalling = ref(false)
+const unlinkingSharedInstance = ref(false)
+const installationSettingsBusy = computed(
+	() =>
+		instance.value.quarantined ||
+		instance.value.install_stage !== 'installed' ||
+		repairing.value ||
+		reinstalling.value ||
+		unlinkingSharedInstance.value ||
+		!!offline,
+)
+const installationSettingsBusyMessage = computed(() =>
+	instance.value.quarantined ? formatMessage(messages.locked) : null,
+)
+
+async function unlinkSharedInstance() {
+	unlinkingSharedInstance.value = true
+	try {
+		await unlink_shared_instance(instance.value.id)
+		await queryClient.invalidateQueries({ queryKey: ['sharedInstanceUsers', instance.value.id] })
+		await queryClient.invalidateQueries({ queryKey: ['linkedModpackInfo', instance.value.id] })
+		onUnlinked()
+	} catch (error) {
+		handleError(error)
+	} finally {
+		unlinkingSharedInstance.value = false
+	}
+}
 
 const messages = defineMessages({
 	loaderVersion: {
 		id: 'instance.settings.tabs.installation.loader-version',
 		defaultMessage: '{loader} version',
 	},
+	locked: {
+		id: 'instance.settings.tabs.installation.locked',
+		defaultMessage: 'Installation settings are unavailable while this instance is locked.',
+	},
 })
 
 function getManifest(loader: string) {
@@ -162,27 +199,7 @@ async function installLocalModpackFromPicker() {
 	return !!completed
 }
 
-provideAppBackup({
-	async createBackup() {
-		debug('createBackup: start', {
-			instanceId: instance.value.id,
-			instanceName: instance.value.name,
-		})
-		const allInstances = await list()
-		const prefix = `${instance.value.name} - Backup #`
-		const existingNums = allInstances
-			.filter((p) => p.name.startsWith(prefix))
-			.map((p) => parseInt(p.name.slice(prefix.length), 10))
-			.filter((n) => !isNaN(n))
-		const nextNum = existingNums.length > 0 ? Math.max(...existingNums) + 1 : 1
-		const job = await install_duplicate_instance(instance.value.id)
-		const newInstanceId = installJobInstanceId(job)
-		if (newInstanceId) {
-			await edit(newInstanceId, { name: `${prefix}${nextNum}` })
-		}
-		debug('createBackup: done', { newInstanceId, backupName: `${prefix}${nextNum}` })
-	},
-})
+provideInstanceBackup(instance)
 
 provideInstallationSettings({
 	closeSettings: closeModal,
@@ -208,14 +225,14 @@ provideInstallationSettings({
 		}
 		return rows
 	}),
-	isLinked: computed(() => isModrinthLinkedModpack.value || isImportedModpack.value),
-	isBusy: computed(
+	isLinked: computed(
 		() =>
-			instance.value.install_stage !== 'installed' ||
-			repairing.value ||
-			reinstalling.value ||
-			!!offline,
+			isModrinthLinkedModpack.value ||
+			isImportedModpack.value ||
+			isSharedInstanceManagedModpack.value,
 	),
+	isBusy: installationSettingsBusy,
+	busyMessage: installationSettingsBusyMessage,
 	skipNonEssentialWarnings,
 	modpack: computed(() => {
 		if (isImportedModpack.value && instance.value.link?.type === 'imported_modpack') {
@@ -452,14 +469,28 @@ provideInstallationSettings({
 	isServer: false,
 	isApp: true,
 	showModpackVersionActions: computed(
-		() => isModrinthLinkedModpack.value && !isMinecraftServer.value,
+		() =>
+			isModrinthLinkedModpack.value &&
+			!isMinecraftServer.value &&
+			!isSharedInstanceManagedModpack.value,
 	),
 	isLocalFile: isImportedModpack,
+	isManagedModpack: isSharedInstanceManagedModpack,
+	managedModpackWarning: managedContentPolicy.managedModpackWarning,
 	repairing,
 	reinstalling,
 })
 </script>
 
 <template>
-	<InstallationSettingsLayout />
+	<InstallationSettingsLayout>
+		<template #extra>
+			<SharedInstanceInstallationSettingsControls
+				:can-unlink="canUnlinkSharedInstance"
+				:busy="installationSettingsBusy"
+				:unlinking="unlinkingSharedInstance"
+				:unlink="unlinkSharedInstance"
+			/>
+		</template>
+	</InstallationSettingsLayout>
 </template>
diff --git a/apps/app-frontend/src/components/ui/instance_settings/SharingSettings.vue b/apps/app-frontend/src/components/ui/instance_settings/SharingSettings.vue
new file mode 100644
index 000000000..aef391eea
--- /dev/null
+++ b/apps/app-frontend/src/components/ui/instance_settings/SharingSettings.vue
@@ -0,0 +1,42 @@
+<template>
+	<div>
+		<SharedInstanceInstallationSettingsControls
+			can-unpublish
+			:busy="isBusy"
+			:unpublishing="unpublishing"
+			:unpublish="unpublishSharedInstance"
+		/>
+	</div>
+</template>
+
+<script setup lang="ts">
+import { injectNotificationManager } from '@modrinth/ui'
+import { useQueryClient } from '@tanstack/vue-query'
+import { computed, ref } from 'vue'
+
+import SharedInstanceInstallationSettingsControls from '@/components/ui/shared-instances/SharedInstanceInstallationSettingsControls.vue'
+import { unpublish_shared_instance } from '@/helpers/instance'
+import { injectInstanceSettings } from '@/providers/instance-settings'
+
+const { instance, offline, onUnlinked } = injectInstanceSettings()
+const { handleError } = injectNotificationManager()
+const queryClient = useQueryClient()
+const unpublishing = ref(false)
+const isBusy = computed(
+	() => instance.value.install_stage !== 'installed' || unpublishing.value || !!offline,
+)
+
+async function unpublishSharedInstance() {
+	unpublishing.value = true
+	try {
+		await unpublish_shared_instance(instance.value.id)
+		queryClient.setQueryData(['sharedInstanceUsers', instance.value.id], [])
+		await queryClient.invalidateQueries({ queryKey: ['linkedModpackInfo', instance.value.id] })
+		onUnlinked()
+	} catch (error) {
+		handleError(error)
+	} finally {
+		unpublishing.value = false
+	}
+}
+</script>
diff --git a/apps/app-frontend/src/components/ui/modal/AuthGrantFlowWaitModal.vue b/apps/app-frontend/src/components/ui/modal/AuthGrantFlowWaitModal.vue
deleted file mode 100644
index 03f3036f9..000000000
--- a/apps/app-frontend/src/components/ui/modal/AuthGrantFlowWaitModal.vue
+++ /dev/null
@@ -1,43 +0,0 @@
-<script setup lang="ts">
-import { LogInIcon, SpinnerIcon } from '@modrinth/assets'
-import { ref } from 'vue'
-
-import ModalWrapper from '@/components/ui/modal/ModalWrapper.vue'
-
-defineProps({
-	onFlowCancel: {
-		type: Function,
-		default() {
-			return async () => {}
-		},
-	},
-})
-
-const modal = ref()
-
-function show() {
-	modal.value.show()
-}
-
-function hide() {
-	modal.value.hide()
-}
-
-defineExpose({ show, hide })
-</script>
-<template>
-	<ModalWrapper ref="modal" @hide="onFlowCancel">
-		<template #title>
-			<span class="items-center gap-2 text-lg font-extrabold text-contrast">
-				<LogInIcon /> Sign in
-			</span>
-		</template>
-
-		<div class="flex justify-center gap-2">
-			<SpinnerIcon class="w-12 h-12 animate-spin" />
-		</div>
-		<p class="text-sm text-secondary">
-			Please sign in at the browser window that just opened to continue.
-		</p>
-	</ModalWrapper>
-</template>
diff --git a/apps/app-frontend/src/components/ui/modal/InstallToPlayModal.vue b/apps/app-frontend/src/components/ui/modal/InstallToPlayModal.vue
index 31ccce12f..912725f5e 100644
--- a/apps/app-frontend/src/components/ui/modal/InstallToPlayModal.vue
+++ b/apps/app-frontend/src/components/ui/modal/InstallToPlayModal.vue
@@ -4,8 +4,8 @@
 		:header="formatMessage(messages.installToPlay)"
 		:closable="true"
 		:on-hide="show_ads_window"
-		max-width="640px"
-		width="640px"
+		max-width="544px"
+		width="544px"
 	>
 		<div v-if="requiredContentProject" class="flex w-full flex-col gap-6">
 			<p class="m-0 text-primary">
@@ -423,8 +423,8 @@ const messages = defineMessages({
 		defaultMessage: 'Install anyway',
 	},
 	dontInstall: {
-		id: 'app.modal.install-to-play.dont-install',
-		defaultMessage: 'Dont install',
+		id: 'app.modal.install-to-play.external-files-dont-install',
+		defaultMessage: "Don't install",
 	},
 })
 
diff --git a/apps/app-frontend/src/components/ui/modal/InstanceSettingsModal.vue b/apps/app-frontend/src/components/ui/modal/InstanceSettingsModal.vue
index bedef146b..800cac656 100644
--- a/apps/app-frontend/src/components/ui/modal/InstanceSettingsModal.vue
+++ b/apps/app-frontend/src/components/ui/modal/InstanceSettingsModal.vue
@@ -6,6 +6,7 @@ import {
 	CoffeeIcon,
 	InfoIcon,
 	MonitorIcon,
+	UsersIcon,
 	WrenchIcon,
 } from '@modrinth/assets'
 import {
@@ -25,6 +26,7 @@ import GeneralSettings from '@/components/ui/instance_settings/GeneralSettings.v
 import HooksSettings from '@/components/ui/instance_settings/HooksSettings.vue'
 import InstallationSettings from '@/components/ui/instance_settings/InstallationSettings.vue'
 import JavaSettings from '@/components/ui/instance_settings/JavaSettings.vue'
+import SharingSettings from '@/components/ui/instance_settings/SharingSettings.vue'
 import WindowSettings from '@/components/ui/instance_settings/WindowSettings.vue'
 import { get_project_v3 } from '@/helpers/cache'
 import { get_linked_modpack_info } from '@/helpers/instance'
@@ -97,6 +99,15 @@ const tabs = computed<TabbedModalTab[]>(() => [
 		icon: WrenchIcon,
 		content: InstallationSettings,
 	},
+	{
+		name: defineMessage({
+			id: 'instance.settings.tabs.sharing',
+			defaultMessage: 'Sharing',
+		}),
+		icon: UsersIcon,
+		content: SharingSettings,
+		shown: props.instance.shared_instance?.role === 'owner' && !props.instance.quarantined,
+	},
 	{
 		name: defineMessage({
 			id: 'instance.settings.tabs.window',
diff --git a/apps/app-frontend/src/components/ui/modal/ModrinthAccountRequiredModal.vue b/apps/app-frontend/src/components/ui/modal/ModrinthAccountRequiredModal.vue
new file mode 100644
index 000000000..db5dbc880
--- /dev/null
+++ b/apps/app-frontend/src/components/ui/modal/ModrinthAccountRequiredModal.vue
@@ -0,0 +1,265 @@
+<template>
+	<NewModal
+		ref="modal"
+		:header="formatMessage(authenticating ? messages.signingInHeader : messages.header)"
+		:on-hide="handleHide"
+		no-padding
+		max-width="548px"
+		width="100%"
+	>
+		<div v-if="authenticating === null" class="flex w-full flex-col gap-6 p-6">
+			<div class="flex flex-col gap-2 px-3">
+				<h2 class="m-0 text-xl font-semibold leading-7 text-contrast">
+					{{ formatMessage(messages.signInHeading) }}
+				</h2>
+				<p class="m-0 text-base leading-6 text-primary">
+					{{ formatMessage(messages.description) }}
+				</p>
+			</div>
+
+			<div class="flex flex-col gap-6">
+				<div class="grid grid-cols-1 gap-2 sm:grid-cols-2">
+					<ButtonStyled>
+						<button class="w-full !shadow-none" type="button" @click="authenticate('sign-up')">
+							<UserPlusIcon aria-hidden="true" />
+							{{ formatMessage(messages.createAccountButton) }}
+						</button>
+					</ButtonStyled>
+					<ButtonStyled color="brand">
+						<button class="w-full" type="button" @click="authenticate('sign-in')">
+							<LogInIcon aria-hidden="true" />
+							{{ formatMessage(messages.signInButton) }}
+						</button>
+					</ButtonStyled>
+				</div>
+
+				<p class="m-0 text-center text-base font-medium leading-6 text-primary">
+					<IntlFormatted :message-id="messages.supportPrompt">
+						<template #support="{ children }">
+							<button
+								type="button"
+								class="inline cursor-pointer border-0 bg-transparent p-0 text-base font-medium leading-6 text-blue hover:underline"
+								@click="openSupport"
+							>
+								<component :is="() => children" />
+							</button>
+						</template>
+					</IntlFormatted>
+				</p>
+			</div>
+		</div>
+
+		<div v-else class="flex w-full flex-col gap-6 p-6">
+			<div class="flex flex-col gap-2.5 px-3">
+				<div class="flex flex-col gap-2">
+					<h2 class="m-0 text-xl font-semibold leading-7 text-contrast">
+						{{ formatMessage(messages.continueInBrowserHeading) }}
+					</h2>
+					<p class="m-0 text-base leading-6 text-primary">
+						{{ formatMessage(messages.browserDescription) }}
+					</p>
+				</div>
+				<div class="flex items-center gap-1.5 text-primary">
+					<SpinnerIcon aria-hidden="true" class="h-5 w-5 shrink-0 animate-spin" />
+					<span class="text-base leading-6">
+						{{ formatMessage(messages.waitingForBrowser) }}
+					</span>
+				</div>
+			</div>
+
+			<div class="flex flex-col gap-6">
+				<div class="grid grid-cols-1 gap-2 sm:grid-cols-2">
+					<ButtonStyled type="outlined">
+						<button class="w-full" type="button" @click="modal?.hide()">
+							<XIcon aria-hidden="true" />
+							{{ formatMessage(messages.cancelButton) }}
+						</button>
+					</ButtonStyled>
+					<ButtonStyled>
+						<button
+							class="w-full !shadow-none"
+							type="button"
+							:disabled="reopeningBrowser"
+							@click="reopenBrowser"
+						>
+							<RefreshCwIcon aria-hidden="true" />
+							{{ formatMessage(messages.openBrowserAgainButton) }}
+						</button>
+					</ButtonStyled>
+				</div>
+
+				<p class="m-0 text-center text-base font-medium leading-6 text-primary">
+					<IntlFormatted :message-id="messages.supportPrompt">
+						<template #support="{ children }">
+							<button
+								type="button"
+								class="inline cursor-pointer border-0 bg-transparent p-0 text-base font-medium leading-6 text-blue hover:underline"
+								@click="openSupport"
+							>
+								<component :is="() => children" />
+							</button>
+						</template>
+					</IntlFormatted>
+				</p>
+			</div>
+		</div>
+	</NewModal>
+</template>
+
+<script setup lang="ts">
+import { LogInIcon, RefreshCwIcon, SpinnerIcon, UserPlusIcon, XIcon } from '@modrinth/assets'
+import { ButtonStyled, defineMessages, IntlFormatted, NewModal, useVIntl } from '@modrinth/ui'
+import { openUrl } from '@tauri-apps/plugin-opener'
+import { ref } from 'vue'
+
+import { cancelLogin, type ModrinthAuthFlow } from '@/helpers/mr_auth'
+
+const props = defineProps<{
+	requestAuth: (flow: ModrinthAuthFlow) => Promise<boolean>
+}>()
+
+const { formatMessage } = useVIntl()
+const modal = ref<InstanceType<typeof NewModal>>()
+const authenticating = ref<ModrinthAuthFlow | null>(null)
+const reopeningBrowser = ref(false)
+let resolveShow: ((signedIn: boolean) => void) | undefined
+let authenticationId = 0
+let activeAuthentication: Promise<void> | undefined
+
+function show(event?: MouseEvent) {
+	resetAuthentication(true)
+	resolveShow?.(false)
+	const modalInstance = modal.value
+	if (!modalInstance) return Promise.resolve(false)
+
+	return new Promise<boolean>((resolve) => {
+		resolveShow = resolve
+		modalInstance.show(event)
+	})
+}
+
+function showSigningIn(flow: ModrinthAuthFlow = 'sign-in', event?: MouseEvent) {
+	const result = show(event)
+	authenticate(flow)
+	return result
+}
+
+function finish(signedIn: boolean) {
+	resolveShow?.(signedIn)
+	resolveShow = undefined
+}
+
+function authenticate(flow: ModrinthAuthFlow) {
+	const id = ++authenticationId
+	authenticating.value = flow
+
+	const authentication = (async () => {
+		try {
+			if ((await props.requestAuth(flow)) && authenticationId === id) {
+				authenticating.value = null
+				activeAuthentication = undefined
+				finish(true)
+				modal.value?.hide()
+			}
+		} finally {
+			if (authenticationId === id) {
+				authenticating.value = null
+				activeAuthentication = undefined
+			}
+		}
+	})()
+
+	activeAuthentication = authentication
+}
+
+async function reopenBrowser() {
+	const flow = authenticating.value
+	if (!flow || reopeningBrowser.value) return
+
+	reopeningBrowser.value = true
+	const previousAuthentication = activeAuthentication
+	++authenticationId
+
+	try {
+		await cancelLogin()
+		await previousAuthentication?.catch(() => undefined)
+		if (authenticating.value === flow) authenticate(flow)
+	} finally {
+		reopeningBrowser.value = false
+	}
+}
+
+function resetAuthentication(cancelActive: boolean) {
+	const wasAuthenticating = authenticating.value !== null
+	++authenticationId
+	activeAuthentication = undefined
+	authenticating.value = null
+	reopeningBrowser.value = false
+
+	if (cancelActive && wasAuthenticating) void cancelLogin()
+}
+
+function handleHide() {
+	resetAuthentication(true)
+	finish(false)
+}
+
+function openSupport() {
+	openUrl('https://support.modrinth.com')
+}
+
+const messages = defineMessages({
+	header: {
+		id: 'modal.modrinth-account-required.header',
+		defaultMessage: 'Account required',
+	},
+	signingInHeader: {
+		id: 'modal.modrinth-account-required.signing-in-header',
+		defaultMessage: 'Signing in',
+	},
+	signInHeading: {
+		id: 'modal.modrinth-account-required.sign-in-heading',
+		defaultMessage: 'Sign in to a Modrinth account',
+	},
+	description: {
+		id: 'modal.modrinth-account-required.description',
+		defaultMessage:
+			"You'll need to sign into your Modrinth account before you can use this feature.",
+	},
+	createAccountButton: {
+		id: 'modal.modrinth-account-required.create-account-button',
+		defaultMessage: 'Create an account',
+	},
+	signInButton: {
+		id: 'modal.modrinth-account-required.sign-in-button',
+		defaultMessage: 'Sign in to Modrinth',
+	},
+	continueInBrowserHeading: {
+		id: 'modal.modrinth-account-required.continue-in-browser-heading',
+		defaultMessage: 'Continue in your browser',
+	},
+	browserDescription: {
+		id: 'modal.modrinth-account-required.browser-description',
+		defaultMessage:
+			'A new tab opened to sign in. Complete the sign in there, then return to the app.',
+	},
+	waitingForBrowser: {
+		id: 'modal.modrinth-account-required.waiting-for-browser',
+		defaultMessage: 'Waiting for browser confirmation...',
+	},
+	cancelButton: {
+		id: 'modal.modrinth-account-required.cancel-button',
+		defaultMessage: 'Cancel',
+	},
+	openBrowserAgainButton: {
+		id: 'modal.modrinth-account-required.open-browser-again-button',
+		defaultMessage: 'Open browser again',
+	},
+	supportPrompt: {
+		id: 'modal.modrinth-account-required.support-prompt',
+		defaultMessage: 'Having trouble signing in? <support>Get support</support>',
+	},
+})
+
+defineExpose({ show, showSigningIn })
+</script>
diff --git a/apps/app-frontend/src/components/ui/modal/UpdateToPlayModal.vue b/apps/app-frontend/src/components/ui/modal/UpdateToPlayModal.vue
index 9c756e6d6..ba5cff8b2 100644
--- a/apps/app-frontend/src/components/ui/modal/UpdateToPlayModal.vue
+++ b/apps/app-frontend/src/components/ui/modal/UpdateToPlayModal.vue
@@ -8,6 +8,7 @@
 		:diffs="normalizedDiffs"
 		:version-date="versionDate"
 		:show-external-warnings="showExternalWarnings"
+		:external-warning-description="formatMessage(messages.externalWarningDescription)"
 		:confirm-label="formatMessage(commonMessages.updateButton)"
 		:confirm-icon="DownloadIcon"
 		:removed-label="formatMessage(messages.removed)"
@@ -76,10 +77,15 @@ const { formatMessage } = useVIntl()
 const { startInstallingServer, stopInstallingServer } = injectServerInstall()
 type UpdateCompleteCallback = () => void | Promise<void>
 
-defineProps<{
+const { showExternalWarnings } = defineProps<{
 	showExternalWarnings?: boolean
 }>()
 
+const emit = defineEmits<{
+	cancel: []
+	complete: []
+}>()
+
 const diffModal = ref<InstanceType<typeof ContentDiffModal>>()
 const instance = ref<GameInstance | null>(null)
 const onUpdateComplete = ref<UpdateCompleteCallback>(() => {})
@@ -87,16 +93,16 @@ const diffs = ref<DependencyDiff[]>([])
 const modpackVersionId = ref<string | null>(null)
 const modpackVersion = ref<Version | null>(null)
 
-const normalizedDiffs = computed<ContentDiffItem[]>(() =>
-	diffs.value.map((diff) => ({
+const normalizedDiffs = computed<ContentDiffItem[]>(() => {
+	return diffs.value.map((diff) => ({
 		type: diff.type,
 		external: Boolean(diff.fileName && !diff.project),
 		projectName: diff.project?.title,
 		fileName: diff.fileName,
 		currentVersionName: diff.currentVersion?.version_number,
 		newVersionName: diff.newVersion?.version_number,
-	})),
-)
+	}))
+})
 
 const versionDate = computed(() =>
 	modpackVersion.value?.date_published
@@ -242,7 +248,6 @@ async function checkUpdateAvailable(inst: GameInstance): Promise<DependencyDiff[
 }
 
 async function handleUpdate() {
-	hide()
 	const serverProjectId = instance.value?.link?.project_id
 	if (serverProjectId) startInstallingServer(serverProjectId)
 	try {
@@ -255,11 +260,12 @@ async function handleUpdate() {
 		console.error('Error updating instance:', error)
 	} finally {
 		if (serverProjectId) stopInstallingServer(serverProjectId)
+		emit('complete')
 	}
 }
 
 function handleDecline() {
-	hide()
+	emit('cancel')
 }
 
 function show(
@@ -293,12 +299,17 @@ const messages = defineMessages({
 	updateRequiredDescription: {
 		id: 'app.modal.update-to-play.update-required-description',
 		defaultMessage:
-			'An update is required to play {name}. Please update to the latest version to launch the game.',
+			'An update is required to play {name}. Please update to latest version to launch the game.',
 	},
 	removed: {
 		id: 'app.modal.update-to-play.removed',
 		defaultMessage: 'Removed',
 	},
+	externalWarningDescription: {
+		id: 'app.modal.update-to-play.server-modpack-unknown-files-description',
+		defaultMessage:
+			'This server modpack update contains files that aren’t published on Modrinth. We strongly recommend only installing files from sources you trust.',
+	},
 })
 
 const hasUpdate = computed(() => {
diff --git a/apps/app-frontend/src/components/ui/shared-instances/SharedInstanceAlreadyInstalledModal.vue b/apps/app-frontend/src/components/ui/shared-instances/SharedInstanceAlreadyInstalledModal.vue
new file mode 100644
index 000000000..3e5922027
--- /dev/null
+++ b/apps/app-frontend/src/components/ui/shared-instances/SharedInstanceAlreadyInstalledModal.vue
@@ -0,0 +1,100 @@
+<template>
+	<NewModal ref="modal" :header="formatMessage(messages.header)" fade="warning" max-width="500px">
+		<p class="m-0 text-secondary">
+			<IntlFormatted :message-id="messages.body" :values="{ instanceName }">
+				<template #bold="{ children }">
+					<span class="font-medium text-contrast"><component :is="() => children" /></span>
+				</template>
+			</IntlFormatted>
+		</p>
+
+		<template #actions>
+			<div class="flex justify-end gap-2">
+				<ButtonStyled type="outlined">
+					<button @click="handleCancel">
+						<XIcon />
+						{{ formatMessage(commonMessages.cancelButton) }}
+					</button>
+				</ButtonStyled>
+				<ButtonStyled>
+					<button @click="handleGoToInstance">
+						{{ formatMessage(messages.instance) }}
+						<RightArrowIcon />
+					</button>
+				</ButtonStyled>
+				<ButtonStyled color="orange">
+					<button @click="handleInstallAnyway">
+						<DownloadIcon />
+						{{ formatMessage(messages.installAnyway) }}
+					</button>
+				</ButtonStyled>
+			</div>
+		</template>
+	</NewModal>
+</template>
+
+<script setup lang="ts">
+import { DownloadIcon, RightArrowIcon, XIcon } from '@modrinth/assets'
+import {
+	ButtonStyled,
+	commonMessages,
+	defineMessages,
+	IntlFormatted,
+	NewModal,
+	useVIntl,
+} from '@modrinth/ui'
+import { ref } from 'vue'
+
+const { formatMessage } = useVIntl()
+
+const messages = defineMessages({
+	header: {
+		id: 'app.instance.shared-instance-already-installed.header',
+		defaultMessage: 'Shared instance already installed',
+	},
+	body: {
+		id: 'app.instance.shared-instance-already-installed.body',
+		defaultMessage:
+			'This shared instance is already installed as <bold>{instanceName}</bold>. Are you sure you want to install another copy?',
+	},
+	instance: {
+		id: 'app.instance.shared-instance-already-installed.instance',
+		defaultMessage: 'Instance',
+	},
+	installAnyway: {
+		id: 'app.instance.shared-instance-already-installed.install-anyway',
+		defaultMessage: 'Install anyway',
+	},
+})
+
+const emit = defineEmits<{
+	(e: 'cancel' | 'go-to-instance' | 'install-anyway'): void
+}>()
+
+const modal = ref<InstanceType<typeof NewModal>>()
+const instanceName = ref('')
+
+function show(name: string) {
+	instanceName.value = name
+	modal.value?.show()
+}
+
+function handleCancel() {
+	modal.value?.hide()
+	emit('cancel')
+}
+
+function handleGoToInstance() {
+	modal.value?.hide()
+	emit('go-to-instance')
+}
+
+function handleInstallAnyway() {
+	modal.value?.hide()
+	emit('install-anyway')
+}
+
+defineExpose({
+	show,
+})
+</script>
diff --git a/apps/app-frontend/src/components/ui/shared-instances/SharedInstanceInstallationSettingsControls.vue b/apps/app-frontend/src/components/ui/shared-instances/SharedInstanceInstallationSettingsControls.vue
new file mode 100644
index 000000000..d72f17090
--- /dev/null
+++ b/apps/app-frontend/src/components/ui/shared-instances/SharedInstanceInstallationSettingsControls.vue
@@ -0,0 +1,195 @@
+<template>
+	<div v-if="canUnpublish" class="flex flex-col gap-2.5">
+		<span class="text-lg font-semibold text-contrast">{{ formatMessage(messages.title) }}</span>
+		<div>
+			<ButtonStyled color="orange">
+				<button :disabled="busy" @click="unpublishModal?.show()">
+					<SpinnerIcon v-if="unpublishing" class="animate-spin" />
+					<UnlinkIcon v-else class="size-5" />
+					{{ formatMessage(unpublishing ? messages.unpublishingButton : messages.unpublishButton) }}
+				</button>
+			</ButtonStyled>
+		</div>
+		<span class="text-primary">{{ formatMessage(messages.unpublishDescription) }}</span>
+	</div>
+	<div v-if="canUnlink" class="flex flex-col gap-2.5">
+		<span class="text-lg font-semibold text-contrast">{{
+			formatMessage(messages.linkedTitle)
+		}}</span>
+		<div>
+			<ButtonStyled color="orange">
+				<button :disabled="busy" @click="unlinkModal?.show()">
+					<SpinnerIcon v-if="unlinking" class="animate-spin" />
+					<UnlinkIcon v-else class="size-5" />
+					{{ formatMessage(unlinking ? messages.unlinkingButton : messages.unlinkButton) }}
+				</button>
+			</ButtonStyled>
+		</div>
+		<span class="text-primary">{{ formatMessage(messages.unlinkDescription) }}</span>
+	</div>
+
+	<NewModal
+		ref="unpublishModal"
+		:header="formatMessage(messages.unpublishModalHeader)"
+		fade="warning"
+		max-width="500px"
+	>
+		<Admonition type="warning" :header="formatMessage(messages.unpublishModalAdmonitionHeader)">{{
+			formatMessage(messages.unpublishModalBody)
+		}}</Admonition>
+		<template #actions
+			><div class="flex justify-end gap-2">
+				<ButtonStyled type="outlined"
+					><button class="!border" @click="unpublishModal?.hide()">
+						<XIcon />{{ formatMessage(commonMessages.cancelButton) }}
+					</button></ButtonStyled
+				><ButtonStyled color="orange"
+					><button :disabled="busy" @click="confirmUnpublish">
+						<UnlinkIcon />{{ formatMessage(messages.unpublishButton) }}
+					</button></ButtonStyled
+				>
+			</div></template
+		>
+	</NewModal>
+	<NewModal
+		ref="unlinkModal"
+		:header="formatMessage(messages.unlinkModalHeader)"
+		fade="warning"
+		max-width="500px"
+		:on-hide="() => backupCreator?.cancelBackup()"
+	>
+		<div class="flex flex-col gap-6">
+			<Admonition type="warning" :header="formatMessage(messages.unlinkModalAdmonitionHeader)">{{
+				formatMessage(messages.unlinkModalBody)
+			}}</Admonition>
+			<InlineBackupCreator
+				ref="backupCreator"
+				backup-name="Before unlinking shared instance"
+				@update:buttons-disabled="backupBusy = $event"
+			/>
+		</div>
+		<template #actions
+			><div class="flex justify-end gap-2">
+				<ButtonStyled type="outlined"
+					><button class="!border" @click="unlinkModal?.hide()">
+						<XIcon />{{ formatMessage(commonMessages.cancelButton) }}
+					</button></ButtonStyled
+				><ButtonStyled color="orange"
+					><button :disabled="busy || backupBusy" @click="confirmUnlink">
+						<UnlinkIcon />{{ formatMessage(messages.unlinkButton) }}
+					</button></ButtonStyled
+				>
+			</div></template
+		>
+	</NewModal>
+</template>
+
+<script setup lang="ts">
+import { SpinnerIcon, UnlinkIcon, XIcon } from '@modrinth/assets'
+import {
+	Admonition,
+	ButtonStyled,
+	commonMessages,
+	defineMessages,
+	InlineBackupCreator,
+	NewModal,
+	useVIntl,
+} from '@modrinth/ui'
+import { ref } from 'vue'
+
+const props = withDefaults(
+	defineProps<{
+		canUnpublish?: boolean
+		canUnlink?: boolean
+		busy: boolean
+		unpublishing?: boolean
+		unlinking?: boolean
+		unpublish?: () => Promise<void>
+		unlink?: () => Promise<void>
+	}>(),
+	{
+		canUnpublish: false,
+		canUnlink: false,
+		unpublishing: false,
+		unlinking: false,
+		unpublish: undefined,
+		unlink: undefined,
+	},
+)
+const { formatMessage } = useVIntl()
+const unpublishModal = ref<InstanceType<typeof NewModal>>()
+const unlinkModal = ref<InstanceType<typeof NewModal>>()
+const backupCreator = ref<InstanceType<typeof InlineBackupCreator>>()
+const backupBusy = ref(false)
+
+async function confirmUnpublish() {
+	unpublishModal.value?.hide()
+	await props.unpublish?.()
+}
+async function confirmUnlink() {
+	unlinkModal.value?.hide()
+	await props.unlink?.()
+}
+
+const messages = defineMessages({
+	title: {
+		id: 'installation-settings.shared-instance.title',
+		defaultMessage: 'Unpublish instance',
+	},
+	linkedTitle: {
+		id: 'installation-settings.shared-instance.linked-title',
+		defaultMessage: 'Linked shared instance',
+	},
+	unpublishButton: {
+		id: 'installation-settings.shared-instance.unpublish-button',
+		defaultMessage: 'Unpublish shared instance',
+	},
+	unpublishingButton: {
+		id: 'installation-settings.shared-instance.unpublishing-button',
+		defaultMessage: 'Unpublishing...',
+	},
+	unpublishDescription: {
+		id: 'installation-settings.shared-instance.unpublish-description',
+		defaultMessage:
+			'Remove this shared instance from Modrinth and stop sending updates to anyone using it. Your local instance will not be affected.',
+	},
+	unlinkButton: {
+		id: 'installation-settings.shared-instance.unlink-button',
+		defaultMessage: 'Unlink shared instance',
+	},
+	unlinkingButton: {
+		id: 'installation-settings.shared-instance.unlinking-button',
+		defaultMessage: 'Unlinking...',
+	},
+	unlinkDescription: {
+		id: 'installation-settings.shared-instance.unlink-description',
+		defaultMessage: 'Disconnect this local instance from future shared updates.',
+	},
+	unpublishModalHeader: {
+		id: 'installation-settings.unpublish-shared-instance.modal.header',
+		defaultMessage: 'Unpublish shared instance',
+	},
+	unpublishModalAdmonitionHeader: {
+		id: 'installation-settings.unpublish-shared-instance.modal.admonition-header',
+		defaultMessage: 'Unpublishing shared instance',
+	},
+	unpublishModalBody: {
+		id: 'installation-settings.unpublish-shared-instance.modal.admonition-body',
+		defaultMessage:
+			"This deletes the shared instance from Modrinth's servers. People using it in the Modrinth App will stop receiving updates, but your local instance and its content will stay on this device.",
+	},
+	unlinkModalHeader: {
+		id: 'installation-settings.unlink-shared-instance.modal.header',
+		defaultMessage: 'Unlink shared instance',
+	},
+	unlinkModalAdmonitionHeader: {
+		id: 'installation-settings.unlink-shared-instance.modal.admonition-header',
+		defaultMessage: 'Unlinking shared instance',
+	},
+	unlinkModalBody: {
+		id: 'installation-settings.unlink-shared-instance.modal.admonition-body',
+		defaultMessage:
+			'This only affects your local instance. Your installed content will stay on this device, and the shared instance and other people using it will not be affected.',
+	},
+})
+</script>
diff --git a/apps/app-frontend/src/components/ui/shared-instances/SharedInstancePublishModal.vue b/apps/app-frontend/src/components/ui/shared-instances/SharedInstancePublishModal.vue
new file mode 100644
index 000000000..05b9ba6e8
--- /dev/null
+++ b/apps/app-frontend/src/components/ui/shared-instances/SharedInstancePublishModal.vue
@@ -0,0 +1,189 @@
+<template>
+	<ContentDiffModal
+		ref="publishReviewModal"
+		:header="formatMessage(messages.header)"
+		:admonition-header="formatMessage(messages.admonitionHeader)"
+		:description="formatMessage(messages.description)"
+		:diffs="publishDiffs"
+		:confirm-label="formatMessage(messages.publishButton)"
+		:confirm-icon="UploadIcon"
+		:confirm-disabled="publishDiffs.length === 0 && selectedConfigPaths.length === 0"
+		:added-label="formatMessage(messages.addedLabel)"
+		:removed-label="formatMessage(messages.removedLabel)"
+		@confirm="publishChanges"
+		@cancel="finishReview"
+	>
+		<template #additional-content>
+			<Accordion
+				class="min-w-0"
+				overflow-visible
+				button-class="w-full bg-transparent m-0 p-0 border-none"
+			>
+				<template #title>
+					<FileCogIcon class="size-4 shrink-0 text-primary" />
+					<span class="text-lg font-semibold text-contrast">
+						{{ formatMessage(messages.configTitle) }}
+					</span>
+				</template>
+				<div class="flex min-w-0 flex-col gap-3 pt-4">
+					<div class="max-h-[292px] overflow-y-auto rounded-[20px]">
+						<FileTreeSelect
+							v-model="selectedConfigPaths"
+							:items="configFileItems"
+							:show-size="false"
+							:show-modified="false"
+						/>
+					</div>
+				</div>
+			</Accordion>
+		</template>
+	</ContentDiffModal>
+</template>
+
+<script setup lang="ts">
+import { FileCogIcon, UploadIcon } from '@modrinth/assets'
+import {
+	Accordion,
+	type ContentDiffItem,
+	ContentDiffModal,
+	defineMessages,
+	FileTreeSelect,
+	type FileTreeSelectItem,
+	useVIntl,
+} from '@modrinth/ui'
+import { computed, ref } from 'vue'
+
+import {
+	getSharedInstanceUnavailableReason,
+	isSharedInstanceUnavailableError,
+} from '@/helpers/install'
+import { get_shared_instance_publish_preview, publish_shared_instance } from '@/helpers/instance'
+import { useSharedInstanceErrors } from '@/helpers/shared-instance-errors'
+import type { GameInstance } from '@/helpers/types'
+
+type SharedInstancePublishState = 'idle' | 'reviewing' | 'publishing'
+
+const props = defineProps<{
+	instance: GameInstance
+}>()
+
+const emit = defineEmits<{
+	published: []
+	'state-change': [state: SharedInstancePublishState]
+}>()
+
+const { formatMessage } = useVIntl()
+const { notifySharedInstanceError, notifySharedInstanceUnavailable } = useSharedInstanceErrors()
+const publishReviewModal = ref<InstanceType<typeof ContentDiffModal>>()
+const publishDiffs = ref<ContentDiffItem[]>([])
+const configFilePaths = ref<string[]>([])
+const selectedConfigPaths = ref<string[]>([])
+const state = ref<SharedInstancePublishState>('idle')
+const configFileItems = computed<FileTreeSelectItem[]>(() =>
+	configFilePaths.value.map((path) => ({ path, type: 'file' })),
+)
+
+async function show(e?: MouseEvent) {
+	if (state.value !== 'idle') return
+
+	setState('reviewing')
+	let reviewOpened = false
+	try {
+		const preview = await get_shared_instance_publish_preview(props.instance.id)
+		if (!preview) {
+			notifySharedInstanceUnavailable()
+			emit('published')
+			return
+		}
+
+		publishDiffs.value = preview.diffs.map((diff) => ({
+			type: diff.type,
+			projectName: diff.projectName ?? undefined,
+			fileName: diff.fileName ?? undefined,
+			currentVersionName: diff.currentVersionName ?? undefined,
+			newVersionName: diff.newVersionName ?? undefined,
+			fileCount: diff.configFileCount ?? undefined,
+			disabled: diff.disabled,
+		}))
+		configFilePaths.value = preview.configFiles
+		selectedConfigPaths.value = []
+		if (!publishReviewModal.value) return
+
+		publishReviewModal.value.show(e)
+		reviewOpened = true
+	} catch (error) {
+		handlePublishError(error)
+	} finally {
+		if (!reviewOpened) finishReview()
+	}
+}
+
+async function publishChanges() {
+	if (state.value !== 'reviewing') return
+
+	setState('publishing')
+	try {
+		await publish_shared_instance(props.instance.id, selectedConfigPaths.value)
+		emit('published')
+	} catch (error) {
+		handlePublishError(error)
+	} finally {
+		setState('idle')
+	}
+}
+
+function finishReview() {
+	if (state.value === 'reviewing') {
+		setState('idle')
+	}
+}
+
+function handlePublishError(error: unknown) {
+	if (isSharedInstanceUnavailableError(error)) {
+		notifySharedInstanceUnavailable(getSharedInstanceUnavailableReason(error))
+		emit('published')
+		return
+	}
+
+	notifySharedInstanceError(error)
+}
+
+function setState(nextState: SharedInstancePublishState) {
+	state.value = nextState
+	emit('state-change', nextState)
+}
+
+const messages = defineMessages({
+	header: {
+		id: 'instance.shared-instance.publish-review.header',
+		defaultMessage: 'Review changes',
+	},
+	admonitionHeader: {
+		id: 'instance.shared-instance.publish-review.admonition-header',
+		defaultMessage: 'Push update to players',
+	},
+	description: {
+		id: 'instance.shared-instance.publish-review.description',
+		defaultMessage:
+			'Review the content changes and choose any config files to include in this update.',
+	},
+	publishButton: {
+		id: 'instance.shared-instance.publish-review.publish-button',
+		defaultMessage: 'Push update',
+	},
+	addedLabel: {
+		id: 'instance.shared-instance.publish-review.added-label',
+		defaultMessage: 'Added',
+	},
+	removedLabel: {
+		id: 'instance.shared-instance.publish-review.removed-label',
+		defaultMessage: 'Removed',
+	},
+	configTitle: {
+		id: 'instance.shared-instance.publish-review.config-title-v2',
+		defaultMessage: 'Select config files',
+	},
+})
+
+defineExpose({ show })
+</script>
diff --git a/apps/app-frontend/src/components/ui/shared-instances/SharedInstanceUpdateModal.vue b/apps/app-frontend/src/components/ui/shared-instances/SharedInstanceUpdateModal.vue
new file mode 100644
index 000000000..4767a6ff0
--- /dev/null
+++ b/apps/app-frontend/src/components/ui/shared-instances/SharedInstanceUpdateModal.vue
@@ -0,0 +1,131 @@
+<template>
+	<ContentDiffModal
+		ref="modal"
+		:header="formatMessage(messages.updateToPlay)"
+		:admonition-header="formatMessage(messages.updateRequired)"
+		:description="instance ? formatMessage(messages.description, { name: instance.name }) : ''"
+		:diffs="diffs"
+		:confirm-label="formatMessage(commonMessages.updateButton)"
+		:confirm-icon="DownloadIcon"
+		:added-label="formatMessage(messages.addedLabel)"
+		:removed-label="formatMessage(messages.removedLabel)"
+		show-report-button
+		show-external-warnings
+		:external-warning-description="formatMessage(messages.externalWarningDescription)"
+		@confirm="update"
+		@cancel="emit('cancel')"
+		@report="emit('report', $event)"
+	/>
+</template>
+
+<script setup lang="ts">
+import { DownloadIcon } from '@modrinth/assets'
+import {
+	commonMessages,
+	type ContentDiffItem,
+	ContentDiffModal,
+	defineMessages,
+	useVIntl,
+} from '@modrinth/ui'
+import { computed, ref } from 'vue'
+
+import {
+	getSharedInstanceUnavailableReason,
+	install_update_shared_instance,
+	isSharedInstanceUnavailableError,
+	type SharedInstanceUnavailableReason,
+	type SharedInstanceUpdatePreview,
+	wait_for_install_job,
+} from '@/helpers/install'
+import { useSharedInstanceErrors } from '@/helpers/shared-instance-errors'
+import type { GameInstance } from '@/helpers/types'
+
+type UpdateCompleteCallback = () => void | Promise<void>
+
+const emit = defineEmits<{
+	cancel: []
+	complete: []
+	report: [event?: MouseEvent]
+	sharedInstanceUnavailable: [reason: SharedInstanceUnavailableReason | null]
+}>()
+const modal = ref<InstanceType<typeof ContentDiffModal>>()
+const instance = ref<GameInstance | null>(null)
+const preview = ref<SharedInstanceUpdatePreview | null>(null)
+const onComplete = ref<UpdateCompleteCallback>(() => {})
+const { formatMessage } = useVIntl()
+const { notifySharedInstanceError } = useSharedInstanceErrors()
+const diffs = computed<ContentDiffItem[]>(
+	() =>
+		preview.value?.diffs.map((diff) => ({
+			type: diff.type,
+			projectName: diff.projectName ?? undefined,
+			fileName: diff.fileName ?? undefined,
+			currentVersionName: diff.currentVersionName ?? undefined,
+			newVersionName: diff.newVersionName ?? undefined,
+			fileCount: diff.configFileCount ?? undefined,
+			disabled: diff.disabled,
+			external: diff.type === 'added' && !diff.projectId && !!diff.fileName,
+		})) ?? [],
+)
+
+async function update() {
+	try {
+		if (instance.value) {
+			const job = await install_update_shared_instance(instance.value.id)
+			await wait_for_install_job(job.job_id)
+			await onComplete.value()
+		}
+	} catch (error) {
+		if (isSharedInstanceUnavailableError(error)) {
+			emit('sharedInstanceUnavailable', getSharedInstanceUnavailableReason(error))
+			return
+		}
+		notifySharedInstanceError(error)
+	} finally {
+		emit('complete')
+	}
+}
+
+function show(
+	instanceValue: GameInstance,
+	previewValue: SharedInstanceUpdatePreview,
+	callback: UpdateCompleteCallback = () => {},
+	event?: MouseEvent,
+) {
+	instance.value = instanceValue
+	preview.value = previewValue
+	onComplete.value = callback
+	modal.value?.show(event)
+}
+function hide() {
+	modal.value?.hide()
+}
+
+const messages = defineMessages({
+	updateToPlay: { id: 'app.modal.update-to-play.header', defaultMessage: 'Update to play' },
+	updateRequired: {
+		id: 'app.modal.update-to-play.update-required',
+		defaultMessage: 'Update required',
+	},
+	description: {
+		id: 'app.modal.update-to-play.update-required-description',
+		defaultMessage:
+			'An update is required to play {name}. Please update to latest version to launch the game.',
+	},
+	addedLabel: {
+		id: 'app.modal.update-to-play.shared-instance-added-label',
+		defaultMessage: 'Added',
+	},
+	removedLabel: {
+		id: 'app.modal.update-to-play.shared-instance-removed-label',
+		defaultMessage: 'Removed',
+	},
+	externalWarningDescription: {
+		id: 'app.modal.update-to-play.shared-instance-unknown-files-description',
+		defaultMessage:
+			'This shared instance update contains files that aren’t published on Modrinth. We strongly recommend only installing files from sources you trust.',
+	},
+})
+
+defineExpose({ show, hide })
+</script>
diff --git a/apps/app-frontend/src/components/ui/shared-instances/shared-instance-install-modal/index.vue b/apps/app-frontend/src/components/ui/shared-instances/shared-instance-install-modal/index.vue
new file mode 100644
index 000000000..e4ebfd949
--- /dev/null
+++ b/apps/app-frontend/src/components/ui/shared-instances/shared-instance-install-modal/index.vue
@@ -0,0 +1,533 @@
+<template>
+	<NewModal
+		ref="modal"
+		:header="
+			reportMode
+				? formatMessage(messages.reportSharedInstance)
+				: formatMessage(messages.installToPlay)
+		"
+		:closable="!submitLoading"
+		:on-hide="handleHide"
+		:max-width="reportMode ? '816px' : '544px'"
+		:width="reportMode ? '816px' : '544px'"
+		:no-padding="reportMode"
+		:scrollable="reportMode"
+	>
+		<div v-if="preview" class="flex w-full flex-col gap-6" :class="{ 'p-6 pb-2': reportMode }">
+			<Admonition v-if="reportMode" type="info">
+				<div class="flex flex-col gap-2">
+					<p class="m-0">
+						<IntlFormatted :message-id="messages.reportDescription">
+							<template #rules-link="{ children }">
+								<AutoLink class="text-link hover:underline" to="https://modrinth.com/legal/rules">
+									<component :is="() => children" />
+								</AutoLink>
+							</template>
+							<template #terms-link="{ children }">
+								<AutoLink class="text-link hover:underline" to="https://modrinth.com/legal/terms">
+									<component :is="() => children" />
+								</AutoLink>
+							</template>
+						</IntlFormatted>
+					</p>
+					<ul class="m-0 list-disc pl-5">
+						<li>
+							<IntlFormatted :message-id="messages.supportAndBugReports">
+								<template #support-link="{ children }">
+									<AutoLink class="text-link hover:underline" to="https://support.modrinth.com">
+										<component :is="() => children" />
+									</AutoLink>
+								</template>
+								<template #github-link="{ children }">
+									<AutoLink
+										class="text-link hover:underline"
+										to="https://github.com/modrinth/code/issues"
+									>
+										<component :is="() => children" />
+									</AutoLink>
+								</template>
+							</IntlFormatted>
+						</li>
+						<li>
+							<IntlFormatted :message-id="messages.legalClaims">
+								<template #copyright-link="{ children }">
+									<AutoLink
+										class="text-link hover:underline"
+										to="https://modrinth.com/legal/copyright"
+									>
+										<component :is="() => children" />
+									</AutoLink>
+								</template>
+							</IntlFormatted>
+						</li>
+					</ul>
+				</div>
+			</Admonition>
+			<p v-else class="m-0 text-primary">
+				{{ formatMessage(messages.inviteWarning) }}
+			</p>
+			<SharedInstanceInstallSummary
+				:preview="preview"
+				:heading="reportMode ? formatMessage(messages.contentYouAreReporting) : undefined"
+				@view-contents="openViewContents"
+			/>
+			<Transition
+				enter-active-class="overflow-hidden transition-all duration-200 ease-out"
+				enter-from-class="max-h-0 opacity-0"
+				enter-to-class="max-h-[400px] opacity-100"
+				leave-active-class="overflow-hidden transition-all duration-200 ease-in"
+				leave-from-class="max-h-[400px] opacity-100"
+				leave-to-class="max-h-0 opacity-0"
+			>
+				<div v-if="reportMode" class="flex flex-col gap-6">
+					<div class="flex flex-col gap-2.5">
+						<span class="font-semibold text-contrast">
+							{{ formatMessage(messages.reportReason) }}
+						</span>
+						<Combobox v-model="reportReason" :options="reportReasonOptions" />
+					</div>
+					<div class="flex flex-col gap-2.5">
+						<span class="font-semibold text-contrast">
+							{{ formatMessage(messages.additionalContext) }}
+						</span>
+						<MarkdownEditor
+							v-model="additionalContext"
+							:placeholder="formatMessage(messages.additionalContextPlaceholder)"
+							:on-image-upload="onImageUpload"
+							:min-height="120"
+							:max-height="240"
+						/>
+					</div>
+					<div v-if="reportOnly" class="flex flex-col gap-2">
+						<Checkbox v-model="deleteInstance" :label="formatMessage(messages.deleteInstance)" />
+					</div>
+				</div>
+			</Transition>
+			<Admonition
+				v-if="!reportMode && hasExternalFiles"
+				type="warning"
+				:header="formatMessage(messages.unknownFilesWarning)"
+			>
+				{{ formatMessage(messages.unknownFilesDescription) }}
+			</Admonition>
+
+			<div v-if="!reportMode && hasExternalFiles" class="relative w-full">
+				<div
+					ref="externalFileTable"
+					class="max-h-[242px] overflow-y-auto rounded-2xl"
+					@scroll="checkTableScrollState"
+				>
+					<Table
+						:columns="externalFileColumns"
+						:data="externalFileRows"
+						row-key="id"
+						virtualized
+						:virtual-row-height="48"
+						class="shadow-sm"
+					>
+						<template #cell-name="{ value }">
+							<span class="block truncate" :title="String(value)">{{ value }}</span>
+						</template>
+					</Table>
+				</div>
+				<Transition
+					enter-active-class="transition-all duration-200 ease-out"
+					enter-from-class="opacity-0 max-h-0"
+					enter-to-class="opacity-100 max-h-2"
+					leave-active-class="transition-all duration-200 ease-in"
+					leave-from-class="opacity-100 max-h-2"
+					leave-to-class="opacity-0 max-h-0"
+				>
+					<div
+						v-if="showTableTopFade"
+						class="pointer-events-none absolute left-0 right-0 top-0 z-10 h-2 bg-gradient-to-b from-bg-raised to-transparent"
+					/>
+				</Transition>
+				<Transition
+					enter-active-class="transition-all duration-200 ease-out"
+					enter-from-class="opacity-0 max-h-0"
+					enter-to-class="opacity-100 max-h-2"
+					leave-active-class="transition-all duration-200 ease-in"
+					leave-from-class="opacity-100 max-h-2"
+					leave-to-class="opacity-0 max-h-0"
+				>
+					<div
+						v-if="showTableBottomFade"
+						class="pointer-events-none absolute bottom-0 left-0 right-0 z-10 h-2 bg-gradient-to-t from-bg-raised to-transparent"
+					/>
+				</Transition>
+			</div>
+
+			<p v-if="!reportMode && hasExternalFiles" class="m-0 text-primary">
+				{{ formatMessage(messages.reviewedFiles) }}
+			</p>
+			<div v-if="!reportMode" class="flex w-full items-center justify-between gap-2">
+				<ButtonStyled color="red" type="transparent">
+					<button @click="reportMode = true">
+						<ReportIcon />{{ formatMessage(commonMessages.reportButton) }}
+					</button>
+				</ButtonStyled>
+				<div class="flex items-center gap-2">
+					<template v-if="hasExternalFiles">
+						<ButtonStyled type="transparent" color="orange">
+							<button @click="accept">
+								{{ formatMessage(messages.installAnyway) }}
+							</button>
+						</ButtonStyled>
+						<ButtonStyled color="brand">
+							<button @click="handleCancel">
+								<BanIcon />{{ formatMessage(messages.dontInstall) }}
+							</button>
+						</ButtonStyled>
+					</template>
+					<template v-else>
+						<ButtonStyled type="outlined">
+							<button class="!border" @click="handleCancel">
+								<XIcon />{{ formatMessage(commonMessages.cancelButton) }}
+							</button>
+						</ButtonStyled>
+						<ButtonStyled color="brand">
+							<button @click="accept">
+								<DownloadIcon />{{ formatMessage(messages.installButton) }}
+							</button>
+						</ButtonStyled>
+					</template>
+				</div>
+			</div>
+		</div>
+		<template v-if="reportMode" #actions>
+			<div class="flex justify-end gap-2">
+				<ButtonStyled type="outlined">
+					<button class="!border" :disabled="submitLoading" @click="handleCancel">
+						<XIcon />{{ formatMessage(commonMessages.cancelButton) }}
+					</button>
+				</ButtonStyled>
+				<ButtonStyled color="brand">
+					<button :disabled="!canSubmitReport" @click="submitReport">
+						<SpinnerIcon v-if="submitLoading" class="animate-spin" />
+						<SendIcon v-else />
+						{{ formatMessage(commonMessages.reportButton) }}
+					</button>
+				</ButtonStyled>
+			</div>
+		</template>
+	</NewModal>
+	<ModpackContentModal
+		ref="contentModal"
+		:header="formatMessage(messages.sharedInstanceContent)"
+		:modpack-name="preview?.name ?? ''"
+		:modpack-icon-url="preview?.iconUrl ?? undefined"
+	/>
+</template>
+
+<script setup lang="ts">
+import type { Labrinth } from '@modrinth/api-client'
+import { BanIcon, DownloadIcon, ReportIcon, SendIcon, SpinnerIcon, XIcon } from '@modrinth/assets'
+import {
+	Admonition,
+	AutoLink,
+	ButtonStyled,
+	Checkbox,
+	Combobox,
+	type ComboboxOption,
+	commonMessages,
+	defineMessages,
+	injectModrinthClient,
+	injectNotificationManager,
+	IntlFormatted,
+	MarkdownEditor,
+	ModpackContentModal,
+	NewModal,
+	Table,
+	type TableColumn,
+	useScrollIndicator,
+	useVIntl,
+} from '@modrinth/ui'
+import { computed, nextTick, ref } from 'vue'
+
+import { hide_ads_window, show_ads_window } from '@/helpers/ads'
+import { toError } from '@/helpers/errors'
+import type { SharedInstanceInstallPreview } from '@/helpers/install'
+import { create_report } from '@/helpers/reports'
+
+import SharedInstanceInstallSummary from './shared-instance-install-summary.vue'
+import { useSharedInstancePreviewContent } from './use-shared-instance-preview-content'
+
+type ExternalFileColumn = 'name'
+type ExternalFileRow = {
+	id: string
+	name: string
+}
+
+const modal = ref<InstanceType<typeof NewModal>>()
+const contentModal = ref<InstanceType<typeof ModpackContentModal>>()
+const externalFileTable = ref<HTMLElement | null>(null)
+const preview = ref<SharedInstanceInstallPreview | null>(null)
+const install = ref<() => void | Promise<void>>(() => {})
+const reportMode = ref(false)
+const reportOnly = ref(false)
+type ReportReason = 'malicious' | 'inappropriate' | 'spam'
+const reportReason = ref<ReportReason>('malicious')
+const additionalContext = ref('')
+const deleteInstance = ref(true)
+const submitLoading = ref(false)
+const uploadedImageIDs = ref<string[]>([])
+const emit = defineEmits<{
+	reported: [deleteInstance: boolean]
+}>()
+const { formatMessage } = useVIntl()
+const client = injectModrinthClient()
+const { addNotification, handleError } = injectNotificationManager()
+const { load } = useSharedInstancePreviewContent()
+const {
+	showTopFade: showTableTopFade,
+	showBottomFade: showTableBottomFade,
+	checkScrollState: checkTableScrollState,
+	forceCheck: forceCheckTableScroll,
+} = useScrollIndicator(externalFileTable)
+const hasExternalFiles = computed(() => Boolean(preview.value?.externalFiles.length))
+const externalFileRows = computed<ExternalFileRow[]>(() =>
+	(preview.value?.externalFiles ?? [])
+		.map((file, index) => ({
+			id: `${index}-${file.fileType}-${file.fileName}`,
+			name: file.fileName,
+		}))
+		.sort((left, right) => left.name.localeCompare(right.name)),
+)
+const reportReasonOptions = computed<ComboboxOption<ReportReason>[]>(() => [
+	{ value: 'malicious', label: formatMessage(messages.maliciousReason) },
+	{ value: 'inappropriate', label: formatMessage(messages.inappropriateReason) },
+	{ value: 'spam', label: formatMessage(messages.spamReason) },
+])
+const canSubmitReport = computed(
+	() => Boolean(preview.value && additionalContext.value.trim()) && !submitLoading.value,
+)
+
+async function accept() {
+	hide()
+	try {
+		await install.value()
+	} catch (error) {
+		console.error('Failed to install shared instance:', error)
+	}
+}
+async function openViewContents() {
+	if (!preview.value) return
+	contentModal.value?.showLoading()
+	try {
+		contentModal.value?.show(await load(preview.value))
+	} catch (error) {
+		console.error('Failed to load shared instance contents:', error)
+		contentModal.value?.show([])
+	}
+}
+async function submitReport() {
+	const reportPreview = preview.value
+	const body = additionalContext.value.trim()
+	if (!reportPreview || !body || submitLoading.value) return
+
+	submitLoading.value = true
+	try {
+		const uploadedImages = uploadedImageIDs.value.slice(-10)
+		await create_report({
+			report_type: reportReason.value,
+			item_type: 'shared-instance',
+			item_id: `${reportPreview.sharedInstanceId}/${reportPreview.version}`,
+			body,
+			uploaded_images: uploadedImages,
+		})
+
+		const shouldDeleteInstance = reportOnly.value && deleteInstance.value
+		hide()
+		addNotification({
+			type: 'success',
+			title: formatMessage(messages.reportSubmitted),
+		})
+		emit('reported', shouldDeleteInstance)
+	} catch (error) {
+		handleError(toError(error))
+	} finally {
+		submitLoading.value = false
+	}
+}
+async function onImageUpload(file: File) {
+	const imageExtensionByType: Partial<Record<string, Labrinth.Images.v3.ImageExtension>> = {
+		'image/gif': 'gif',
+		'image/jpeg': 'jpeg',
+		'image/png': 'png',
+		'image/webp': 'webp',
+	}
+	const extension = imageExtensionByType[file.type]
+	if (!extension) {
+		throw new Error(formatMessage(messages.invalidImageType))
+	}
+	if (file.size > 1024 * 1024) {
+		throw new Error(formatMessage(messages.imageTooLarge))
+	}
+
+	const image = await client.labrinth.images_v3.uploadImage(file, extension, {
+		context: 'report',
+	}).promise
+	uploadedImageIDs.value.push(image.id)
+	return image.url
+}
+function handleCancel() {
+	if (reportMode.value && !reportOnly.value) {
+		reportMode.value = false
+		void nextTick(() => forceCheckTableScroll())
+		return
+	}
+	hide()
+}
+function handleHide() {
+	resetReportState()
+	show_ads_window()
+}
+function resetReportState() {
+	reportMode.value = false
+	reportOnly.value = false
+	reportReason.value = 'malicious'
+	additionalContext.value = ''
+	deleteInstance.value = true
+	submitLoading.value = false
+	uploadedImageIDs.value = []
+}
+function show(
+	previewValue: SharedInstanceInstallPreview,
+	installValue: () => void | Promise<void>,
+	event?: MouseEvent,
+) {
+	resetReportState()
+	install.value = installValue
+	showPreview(previewValue, event)
+}
+function showReport(previewValue: SharedInstanceInstallPreview, event?: MouseEvent) {
+	resetReportState()
+	reportMode.value = true
+	reportOnly.value = true
+	install.value = () => {}
+	showPreview(previewValue, event)
+}
+function showPreview(previewValue: SharedInstanceInstallPreview, event?: MouseEvent) {
+	preview.value = previewValue
+	hide_ads_window()
+	modal.value?.show(event)
+	void nextTick(() => forceCheckTableScroll())
+}
+function hide() {
+	modal.value?.hide()
+}
+
+const messages = defineMessages({
+	installToPlay: { id: 'app.modal.install-to-play.header', defaultMessage: 'Install to play' },
+	reportSharedInstance: {
+		id: 'app.modal.install-to-play.report-shared-instance-header',
+		defaultMessage: 'Report shared instance',
+	},
+	reportSubmitted: {
+		id: 'app.modal.install-to-play.report-submitted',
+		defaultMessage: 'Report submitted',
+	},
+	sharedInstanceContent: {
+		id: 'app.modal.install-to-play.shared-instance-content',
+		defaultMessage: 'Shared instance content',
+	},
+	inviteWarning: {
+		id: 'app.modal.install-to-play.invite-warning',
+		defaultMessage:
+			'This invite was created by another Modrinth user, not Modrinth. Only accept invites from people you trust.',
+	},
+	reportDescription: {
+		id: 'app.modal.install-to-play.report-description',
+		defaultMessage:
+			'Use this form to report instances that may violate our <rules-link>Rules</rules-link> or <terms-link>Terms of Use</terms-link>.',
+	},
+	supportAndBugReports: {
+		id: 'app.modal.install-to-play.report-support-and-bugs',
+		defaultMessage:
+			'For support requests, contact our <support-link>support team</support-link>. For bug reports, open a <github-link>GitHub issue</github-link>.',
+	},
+	legalClaims: {
+		id: 'app.modal.install-to-play.report-legal-claims',
+		defaultMessage:
+			'For DMCA notices or other legal claims, see our <copyright-link>Copyright Policy</copyright-link>.',
+	},
+	contentYouAreReporting: {
+		id: 'app.modal.install-to-play.content-you-are-reporting',
+		defaultMessage: 'Instance you’re reporting',
+	},
+	reportReason: {
+		id: 'app.modal.install-to-play.report-reason',
+		defaultMessage: 'Which rule does this instance violate?',
+	},
+	maliciousReason: {
+		id: 'app.modal.install-to-play.report-reason.malicious',
+		defaultMessage: 'Malicious',
+	},
+	inappropriateReason: {
+		id: 'app.modal.install-to-play.report-reason.inappropriate',
+		defaultMessage: 'Inappropriate',
+	},
+	spamReason: {
+		id: 'app.modal.install-to-play.report-reason.spam',
+		defaultMessage: 'Spam',
+	},
+	additionalContext: {
+		id: 'app.modal.install-to-play.additional-context',
+		defaultMessage: 'Additional context',
+	},
+	additionalContextPlaceholder: {
+		id: 'app.modal.install-to-play.additional-context-placeholder',
+		defaultMessage: 'Include links and images if possible and relevant',
+	},
+	invalidImageType: {
+		id: 'app.modal.install-to-play.report-image-invalid-type',
+		defaultMessage: 'File is not an accepted image type',
+	},
+	imageTooLarge: {
+		id: 'app.modal.install-to-play.report-image-too-large',
+		defaultMessage: 'File exceeds the 1 MiB size limit',
+	},
+	deleteInstance: {
+		id: 'app.modal.install-to-play.delete-instance',
+		defaultMessage: 'Delete instance',
+	},
+	unknownFilesWarning: {
+		id: 'app.modal.install-to-play.unknown-files-warning',
+		defaultMessage: 'Unknown files warning',
+	},
+	unknownFilesDescription: {
+		id: 'app.modal.install-to-play.shared-instance-unknown-files-description',
+		defaultMessage:
+			'This shared instance contains files that aren’t published on Modrinth. We strongly recommend only installing files from sources you trust.',
+	},
+	unrecognizedFiles: {
+		id: 'app.modal.install-to-play.unrecognized-files',
+		defaultMessage: 'Unrecognized files',
+	},
+	reviewedFiles: {
+		id: 'app.modal.install-to-play.reviewed-files',
+		defaultMessage:
+			'A file is only reviewed if it’s published to Modrinth, regardless of its file format (including .mrpack).',
+	},
+	installAnyway: {
+		id: 'app.modal.install-to-play.install-anyway',
+		defaultMessage: 'Install anyway',
+	},
+	dontInstall: {
+		id: 'app.modal.install-to-play.external-files-dont-install',
+		defaultMessage: "Don't install",
+	},
+	installButton: { id: 'app.modal.install-to-play.install-button', defaultMessage: 'Install' },
+})
+
+const externalFileColumns = computed<TableColumn<ExternalFileColumn>[]>(() => [
+	{
+		key: 'name',
+		label: formatMessage(messages.unrecognizedFiles),
+		cellClass: '!h-12',
+	},
+])
+
+defineExpose({ show, showReport, hide })
+</script>
diff --git a/apps/app-frontend/src/components/ui/shared-instances/shared-instance-install-modal/shared-instance-install-summary.vue b/apps/app-frontend/src/components/ui/shared-instances/shared-instance-install-modal/shared-instance-install-summary.vue
new file mode 100644
index 000000000..8db6f7abb
--- /dev/null
+++ b/apps/app-frontend/src/components/ui/shared-instances/shared-instance-install-modal/shared-instance-install-summary.vue
@@ -0,0 +1,60 @@
+<template>
+	<div class="flex flex-col gap-2.5">
+		<div class="flex items-center justify-between">
+			<span class="font-semibold text-contrast">{{
+				heading ?? formatMessage(messages.sharedInstance)
+			}}</span>
+			<ButtonStyled type="transparent">
+				<button @click="emit('viewContents')">
+					<EyeIcon />
+					{{ formatMessage(messages.viewContents) }}
+				</button>
+			</ButtonStyled>
+		</div>
+		<div class="flex items-center gap-3 rounded-2xl bg-surface-2 p-3">
+			<Avatar
+				:src="preview.iconUrl"
+				:alt="preview.name"
+				size="56px"
+				no-shadow
+				class="!rounded-2xl"
+			/>
+			<div class="flex min-w-0 flex-col gap-0.5">
+				<span class="truncate font-semibold text-contrast">{{ preview.name }}</span>
+				<span class="truncate text-sm font-medium text-secondary">
+					{{ loaderDisplay }} {{ preview.gameVersion }}
+					<template v-if="preview.modCount">
+						· {{ formatMessage(messages.modCount, { count: preview.modCount }) }}
+					</template>
+				</span>
+			</div>
+		</div>
+	</div>
+</template>
+
+<script setup lang="ts">
+import { EyeIcon } from '@modrinth/assets'
+import { Avatar, ButtonStyled, defineMessages, formatLoader, useVIntl } from '@modrinth/ui'
+import { computed, toRefs } from 'vue'
+
+import type { SharedInstanceInstallPreview } from '@/helpers/install'
+
+const props = defineProps<{ preview: SharedInstanceInstallPreview; heading?: string }>()
+const { preview, heading } = toRefs(props)
+const emit = defineEmits<{ viewContents: [] }>()
+const { formatMessage } = useVIntl()
+const loaderDisplay = computed(() =>
+	preview.value.loader ? formatLoader(formatMessage, preview.value.loader) : '',
+)
+const messages = defineMessages({
+	sharedInstance: {
+		id: 'app.modal.install-to-play.shared-instance',
+		defaultMessage: 'Shared instance',
+	},
+	viewContents: { id: 'app.modal.install-to-play.view-contents', defaultMessage: 'View contents' },
+	modCount: {
+		id: 'app.modal.install-to-play.mod-count',
+		defaultMessage: '{count, plural, one {# mod} other {# mods}}',
+	},
+})
+</script>
diff --git a/apps/app-frontend/src/components/ui/shared-instances/shared-instance-install-modal/use-shared-instance-preview-content.ts b/apps/app-frontend/src/components/ui/shared-instances/shared-instance-install-modal/use-shared-instance-preview-content.ts
new file mode 100644
index 000000000..671b4b189
--- /dev/null
+++ b/apps/app-frontend/src/components/ui/shared-instances/shared-instance-install-modal/use-shared-instance-preview-content.ts
@@ -0,0 +1,135 @@
+import type { Labrinth } from '@modrinth/api-client'
+import type { ContentItem } from '@modrinth/ui'
+
+import { get_project_many, get_version, get_version_many } from '@/helpers/cache.js'
+import type { SharedInstanceInstallPreview } from '@/helpers/install'
+
+type VersionDependency = Labrinth.Versions.v2.Dependency & { version_id?: string }
+
+export function useSharedInstancePreviewContent() {
+	async function load(preview: SharedInstanceInstallPreview): Promise<ContentItem[]> {
+		return [
+			...preview.externalFiles.map(externalFileContentItem),
+			...(await modpackContentItems(preview)),
+			...(await contentItemsFromVersionIds(
+				preview.contentVersionIds.filter((id) => id !== preview.modpackVersionId),
+			)),
+		]
+	}
+
+	async function modpackContentItems(preview: SharedInstanceInstallPreview) {
+		if (!preview.modpackVersionId) return []
+		const version = await get_version(preview.modpackVersionId, 'must_revalidate')
+		return await contentItemsFromDependencies(version?.dependencies ?? [])
+	}
+
+	async function contentItemsFromDependencies(dependencies: Labrinth.Versions.v2.Dependency[]) {
+		const deps = dependencies as VersionDependency[]
+		const projectIds = unique(deps.map((dep) => dep.project_id).filter((id): id is string => !!id))
+		const versionIds = unique(deps.map((dep) => dep.version_id).filter((id): id is string => !!id))
+		const [projects, versions]: [Labrinth.Projects.v2.Project[], Labrinth.Versions.v2.Version[]] =
+			await Promise.all([
+				projectIds.length ? get_project_many(projectIds, 'must_revalidate') : [],
+				versionIds.length ? get_version_many(versionIds, 'must_revalidate') : [],
+			])
+		const projectMap = new Map(projects.map((project) => [project.id, project]))
+		const versionMap = new Map(versions.map((version) => [version.id, version]))
+
+		return deps.map((dependency): ContentItem => {
+			const project = dependency.project_id ? projectMap.get(dependency.project_id) : null
+			const version = dependency.version_id ? versionMap.get(dependency.version_id) : null
+			const fileName =
+				version?.files?.[0]?.filename ?? dependency.file_name ?? project?.title ?? 'Unknown'
+			return contentItem(
+				version?.id ?? project?.id ?? fileName,
+				fileName,
+				project,
+				version,
+				!project && !version,
+				dependency.project_id ?? fileName,
+				dependency.file_name ?? fileName,
+			)
+		})
+	}
+
+	async function contentItemsFromVersionIds(versionIds: string[]) {
+		const versions: Labrinth.Versions.v2.Version[] = versionIds.length
+			? await get_version_many(unique(versionIds), 'must_revalidate')
+			: []
+		const projectIds = unique(versions.map((version) => version.project_id).filter(Boolean))
+		const projects: Labrinth.Projects.v2.Project[] = projectIds.length
+			? await get_project_many(projectIds, 'must_revalidate')
+			: []
+		const projectMap = new Map(projects.map((project) => [project.id, project]))
+		return versions.map((version): ContentItem => {
+			const project = projectMap.get(version.project_id)
+			const fileName = version.files?.[0]?.filename ?? project?.title ?? version.name ?? 'Unknown'
+			return contentItem(
+				version.id,
+				fileName,
+				project,
+				version,
+				false,
+				version.project_id,
+				version.name,
+			)
+		})
+	}
+
+	return { load }
+}
+
+function contentItem(
+	id: string,
+	fileName: string,
+	project?: Labrinth.Projects.v2.Project | null,
+	version?: Labrinth.Versions.v2.Version | null,
+	external = false,
+	fallbackProjectId = id,
+	fallbackTitle = fileName,
+	projectType = project?.project_type ?? 'mod',
+): ContentItem {
+	return {
+		id,
+		file_name: fileName,
+		project_type: projectType,
+		has_update: false,
+		update_version_id: null,
+		external,
+		project: {
+			id: project?.id ?? fallbackProjectId,
+			slug: project?.slug ?? fallbackProjectId,
+			title: project?.title ?? fallbackTitle,
+			icon_url: project?.icon_url ?? undefined,
+		},
+		...(version
+			? {
+					version: {
+						id: version.id,
+						file_name: fileName,
+						version_number: version.version_number ?? undefined,
+						date_published: version.date_published ?? undefined,
+					},
+				}
+			: {}),
+	}
+}
+
+function externalFileContentItem(
+	file: SharedInstanceInstallPreview['externalFiles'][number],
+): ContentItem {
+	return contentItem(
+		`external:${file.fileType}:${file.fileName}`,
+		file.fileName,
+		null,
+		null,
+		true,
+		file.fileName,
+		file.fileName,
+		file.fileType,
+	)
+}
+
+function unique<T>(values: T[]) {
+	return Array.from(new Set(values))
+}
diff --git a/apps/app-frontend/src/components/ui/shared-instances/shared-instance-invite-handler/index.vue b/apps/app-frontend/src/components/ui/shared-instances/shared-instance-invite-handler/index.vue
new file mode 100644
index 000000000..2229707f4
--- /dev/null
+++ b/apps/app-frontend/src/components/ui/shared-instances/shared-instance-invite-handler/index.vue
@@ -0,0 +1,46 @@
+<template>
+	<ModrinthAccountRequiredModal ref="accountRequiredModal" :request-auth="requestAuth" />
+	<SharedInstanceInstallModal ref="installModal" />
+	<SharedInstanceAlreadyInstalledModal
+		ref="alreadyInstalledModal"
+		@cancel="handleAlreadyInstalledCancel"
+		@go-to-instance="handleAlreadyInstalledGoToInstance"
+		@install-anyway="handleAlreadyInstalledInstallAnyway"
+	/>
+</template>
+
+<script setup lang="ts">
+import { injectAuth } from '@modrinth/ui'
+import { nextTick, ref } from 'vue'
+
+import ModrinthAccountRequiredModal from '@/components/ui/modal/ModrinthAccountRequiredModal.vue'
+import SharedInstanceInstallModal from '@/components/ui/shared-instances/shared-instance-install-modal/index.vue'
+import SharedInstanceAlreadyInstalledModal from '@/components/ui/shared-instances/SharedInstanceAlreadyInstalledModal.vue'
+import type { ModrinthAuthFlow } from '@/helpers/mr_auth'
+
+import type { SharedInstanceInviteHandler } from './shared-instance-invite-types'
+import { useSharedInstanceInviteHandler } from './use-shared-instance-invite-handler'
+
+const auth = injectAuth()
+const installModal = ref<InstanceType<typeof SharedInstanceInstallModal>>()
+const alreadyInstalledModal = ref<InstanceType<typeof SharedInstanceAlreadyInstalledModal>>()
+const accountRequiredModal = ref<InstanceType<typeof ModrinthAccountRequiredModal>>()
+const {
+	handleNotification,
+	installFromInviteId,
+	handleAlreadyInstalledCancel,
+	handleAlreadyInstalledGoToInstance,
+	handleAlreadyInstalledInstallAnyway,
+} = useSharedInstanceInviteHandler(installModal, alreadyInstalledModal, accountRequiredModal)
+
+async function requestAuth(flow: ModrinthAuthFlow) {
+	await auth.requestSignIn('', flow, { showModal: false })
+	await nextTick()
+	return !!auth.session_token.value
+}
+
+defineExpose<SharedInstanceInviteHandler>({
+	handleNotification,
+	installFromInviteId,
+})
+</script>
diff --git a/apps/app-frontend/src/components/ui/shared-instances/shared-instance-invite-handler/shared-instance-invite-parser.ts b/apps/app-frontend/src/components/ui/shared-instances/shared-instance-invite-handler/shared-instance-invite-parser.ts
new file mode 100644
index 000000000..60803ee4a
--- /dev/null
+++ b/apps/app-frontend/src/components/ui/shared-instances/shared-instance-invite-handler/shared-instance-invite-parser.ts
@@ -0,0 +1,29 @@
+import type {
+	AppNotification,
+	SharedInstanceInvite,
+	SharedInstanceInviteNotificationBody,
+} from './shared-instance-invite-types'
+
+function optionalString(value: unknown) {
+	return typeof value === 'string' ? value : null
+}
+
+export function parseSharedInstanceInviteNotification(
+	notification: AppNotification,
+): SharedInstanceInvite | null {
+	if (notification.body?.type !== 'shared_instance_invite') return null
+
+	const body = notification.body as SharedInstanceInviteNotificationBody
+	const sharedInstanceId = optionalString(body.shared_instance_id)
+	const sharedInstanceName = optionalString(body.shared_instance_name)
+	if (!sharedInstanceId || !sharedInstanceName) return null
+
+	return {
+		sharedInstanceId,
+		sharedInstanceName,
+		invitedById: optionalString(body.invited_by),
+		invitedByUsername: optionalString(body.invited_by_username),
+		invitedByAvatarUrl: optionalString(body.invited_by_avatar_url),
+		instanceIconUrl: optionalString(body.shared_instance_icon),
+	}
+}
diff --git a/apps/app-frontend/src/components/ui/shared-instances/shared-instance-invite-handler/shared-instance-invite-types.ts b/apps/app-frontend/src/components/ui/shared-instances/shared-instance-invite-handler/shared-instance-invite-types.ts
new file mode 100644
index 000000000..0227b4542
--- /dev/null
+++ b/apps/app-frontend/src/components/ui/shared-instances/shared-instance-invite-handler/shared-instance-invite-types.ts
@@ -0,0 +1,29 @@
+export type SharedInstanceInviteNotificationBody = {
+	type: 'shared_instance_invite'
+	shared_instance_id?: unknown
+	shared_instance_name?: unknown
+	invited_by?: unknown
+	invited_by_username?: unknown
+	invited_by_avatar_url?: unknown
+	shared_instance_icon?: unknown
+}
+
+export type AppNotification = {
+	id: string | number
+	read?: boolean
+	body?: { type?: unknown } & Record<string, unknown>
+}
+
+export type SharedInstanceInvite = {
+	sharedInstanceId: string
+	sharedInstanceName: string
+	invitedById: string | null
+	invitedByUsername: string | null
+	invitedByAvatarUrl: string | null
+	instanceIconUrl: string | null
+}
+
+export type SharedInstanceInviteHandler = {
+	handleNotification(notification: AppNotification): Promise<boolean>
+	installFromInviteId(inviteId: string): Promise<void>
+}
diff --git a/apps/app-frontend/src/components/ui/shared-instances/shared-instance-invite-handler/use-shared-instance-invite-handler.ts b/apps/app-frontend/src/components/ui/shared-instances/shared-instance-invite-handler/use-shared-instance-invite-handler.ts
new file mode 100644
index 000000000..58f4c1480
--- /dev/null
+++ b/apps/app-frontend/src/components/ui/shared-instances/shared-instance-invite-handler/use-shared-instance-invite-handler.ts
@@ -0,0 +1,252 @@
+import { ModrinthApiError } from '@modrinth/api-client'
+import {
+	injectAuth,
+	injectModrinthClient,
+	injectNotificationManager,
+	injectPopupNotificationManager,
+} from '@modrinth/ui'
+import { useQueryClient } from '@tanstack/vue-query'
+import { openUrl } from '@tauri-apps/plugin-opener'
+import { type Ref, watch } from 'vue'
+import { useRouter } from 'vue-router'
+
+import { config } from '@/config'
+import { get_user } from '@/helpers/cache'
+import { toError } from '@/helpers/errors'
+import {
+	install_accept_shared_instance_invite,
+	install_get_shared_instance_preview,
+	install_shared_instance,
+} from '@/helpers/install'
+import { list } from '@/helpers/instance'
+import { useTheming } from '@/store/state'
+
+import { parseSharedInstanceInviteNotification } from './shared-instance-invite-parser'
+import type { AppNotification, SharedInstanceInvite } from './shared-instance-invite-types'
+
+type InstallModal = {
+	show(
+		preview: Awaited<ReturnType<typeof install_get_shared_instance_preview>>,
+		install: () => Promise<void>,
+	): void
+}
+
+type AccountRequiredModal = {
+	show(event?: MouseEvent): Promise<boolean>
+}
+
+type AlreadyInstalledModal = {
+	show(instanceName: string): void
+}
+
+export function useSharedInstanceInviteHandler(
+	installModal: Ref<InstallModal | undefined>,
+	alreadyInstalledModal: Ref<AlreadyInstalledModal | undefined>,
+	accountRequiredModal: Ref<AccountRequiredModal | undefined>,
+) {
+	const auth = injectAuth()
+	const client = injectModrinthClient()
+	const { handleError } = injectNotificationManager()
+	const { addPopupNotification } = injectPopupNotificationManager()
+	const queryClient = useQueryClient()
+	const router = useRouter()
+	const themeStore = useTheming()
+	const displayedNotifications = new Set<string | number>()
+	let pendingAlreadyInstalled:
+		| {
+				instanceId: string
+				preview: Awaited<ReturnType<typeof install_get_shared_instance_preview>>
+				install: () => Promise<void>
+				onGoToInstance?: () => void | Promise<void>
+		  }
+		| undefined
+
+	async function markNotificationRead(notification: AppNotification) {
+		try {
+			await client.labrinth.notifications_v2.markAsRead(String(notification.id))
+		} catch (error) {
+			if (error instanceof ModrinthApiError && error.statusCode === 404) return
+			throw error
+		}
+	}
+
+	async function resolveInvite(invite: SharedInstanceInvite) {
+		const [invitedBy, sharedInstance] = await Promise.all([
+			!invite.invitedByUsername && invite.invitedById
+				? get_user(invite.invitedById, 'bypass').catch(() => null)
+				: null,
+			client.sharedinstances.instances_v1.get(invite.sharedInstanceId).catch(() => null),
+		])
+
+		return {
+			...invite,
+			invitedByUsername: invite.invitedByUsername ?? invitedBy?.username ?? null,
+			invitedByAvatarUrl: invite.invitedByAvatarUrl ?? invitedBy?.avatar_url ?? null,
+			instanceIconUrl: sharedInstance ? sharedInstance.icon : invite.instanceIconUrl,
+		}
+	}
+
+	function showInstall(
+		preview: Awaited<ReturnType<typeof install_get_shared_instance_preview>>,
+		install: () => Promise<void>,
+	) {
+		if (!installModal.value) throw new Error('Shared instance install modal is not available.')
+		installModal.value.show(preview, install)
+	}
+
+	async function showInstallOrAlreadyInstalled(
+		sharedInstanceId: string,
+		preview: Awaited<ReturnType<typeof install_get_shared_instance_preview>>,
+		install: () => Promise<void>,
+		onGoToInstance?: () => void | Promise<void>,
+	) {
+		const existingInstance = (await list()).find(
+			(instance) => instance.shared_instance?.id === sharedInstanceId,
+		)
+
+		if (!existingInstance || themeStore.getFeatureFlag('skip_non_essential_warnings')) {
+			showInstall(preview, install)
+			return
+		}
+
+		if (!alreadyInstalledModal.value) {
+			throw new Error('Shared instance already installed modal is not available.')
+		}
+
+		pendingAlreadyInstalled = {
+			instanceId: existingInstance.id,
+			preview,
+			install,
+			onGoToInstance,
+		}
+		alreadyInstalledModal.value.show(existingInstance.name)
+	}
+
+	function handleAlreadyInstalledCancel() {
+		pendingAlreadyInstalled = undefined
+	}
+
+	async function handleAlreadyInstalledGoToInstance() {
+		const pending = pendingAlreadyInstalled
+		pendingAlreadyInstalled = undefined
+		if (!pending) return
+
+		if (pending.onGoToInstance) {
+			try {
+				await pending.onGoToInstance()
+			} catch (error) {
+				handleError(toError(error))
+			}
+		}
+		await router.push(`/instance/${encodeURIComponent(pending.instanceId)}/`)
+	}
+
+	function handleAlreadyInstalledInstallAnyway() {
+		const pending = pendingAlreadyInstalled
+		pendingAlreadyInstalled = undefined
+		if (!pending) return
+		showInstall(pending.preview, pending.install)
+	}
+
+	async function acceptNotification(notification: AppNotification, invite: SharedInstanceInvite) {
+		try {
+			const preview = await install_get_shared_instance_preview(
+				invite.sharedInstanceId,
+				invite.sharedInstanceName,
+			)
+			if (invite.instanceIconUrl) preview.iconUrl = invite.instanceIconUrl
+
+			await showInstallOrAlreadyInstalled(
+				invite.sharedInstanceId,
+				preview,
+				async () => {
+					await install_shared_instance(
+						invite.sharedInstanceId,
+						invite.sharedInstanceName,
+						invite.invitedById,
+						null,
+						null,
+						invite.instanceIconUrl,
+					)
+					await markNotificationRead(notification)
+					await queryClient.invalidateQueries({ queryKey: ['instances'] })
+				},
+				() => markNotificationRead(notification),
+			)
+		} catch (error) {
+			handleError(toError(error))
+		}
+	}
+
+	async function handleNotification(notification: AppNotification) {
+		const parsedInvite = parseSharedInstanceInviteNotification(notification)
+		if (!parsedInvite) return false
+		if (displayedNotifications.has(notification.id)) return true
+
+		displayedNotifications.add(notification.id)
+		const invite = await resolveInvite(parsedInvite)
+		addPopupNotification({
+			title: invite.sharedInstanceName,
+			autoCloseMs: null,
+			toast: {
+				type: 'instance-invite',
+				actorName: invite.invitedByUsername,
+				actorAvatarUrl: invite.invitedByAvatarUrl ?? undefined,
+				entityName: invite.sharedInstanceName,
+				entityIconUrl: invite.instanceIconUrl ?? undefined,
+				onAccept: () => acceptNotification(notification, invite),
+				onDecline: () =>
+					markNotificationRead(notification).catch((error) => handleError(toError(error))),
+				onOpenActor: () => {
+					if (invite.invitedByUsername) {
+						openUrl(`${config.siteUrl}/user/${encodeURIComponent(invite.invitedByUsername)}`)
+					}
+				},
+			},
+		})
+		return true
+	}
+
+	async function requireAccount() {
+		if (!auth.isReady?.value) {
+			await new Promise<void>((resolve) => {
+				const stop = watch(auth.isReady!, (ready) => {
+					if (ready) {
+						stop()
+						resolve()
+					}
+				})
+			})
+		}
+		if (auth.session_token.value) return true
+		return (await accountRequiredModal.value?.show()) ?? false
+	}
+
+	async function installFromInviteId(inviteId: string) {
+		try {
+			if (!(await requireAccount())) return
+			const invite = await install_accept_shared_instance_invite(inviteId)
+			await showInstallOrAlreadyInstalled(invite.sharedInstanceId, invite.preview, async () => {
+				await install_shared_instance(
+					invite.sharedInstanceId,
+					invite.preview.name,
+					invite.managerId,
+					invite.serverManagerName,
+					invite.serverManagerIconUrl,
+					invite.instanceIconUrl,
+				)
+				await queryClient.invalidateQueries({ queryKey: ['instances'] })
+			})
+		} catch (error) {
+			handleError(toError(error))
+		}
+	}
+
+	return {
+		handleNotification,
+		installFromInviteId,
+		handleAlreadyInstalledCancel,
+		handleAlreadyInstalledGoToInstance,
+		handleAlreadyInstalledInstallAnyway,
+	}
+}
diff --git a/apps/app-frontend/src/components/ui/world/InstanceItem.vue b/apps/app-frontend/src/components/ui/world/InstanceItem.vue
index f76801f9c..d2c2388ae 100644
--- a/apps/app-frontend/src/components/ui/world/InstanceItem.vue
+++ b/apps/app-frontend/src/components/ui/world/InstanceItem.vue
@@ -80,6 +80,7 @@ const playing = ref(false)
 
 const play = async (event: MouseEvent) => {
 	event?.stopPropagation()
+	if (props.instance.quarantined) return
 	loading.value = true
 	await run(props.instance.id)
 		.catch((err) => handleSevereError(err, { instanceId: props.instance.id }))
@@ -192,8 +193,14 @@ onUnmounted(() => {
 				</ButtonStyled>
 				<ButtonStyled v-else>
 					<button
-						v-tooltip="playing ? 'Instance is already open' : null"
-						:disabled="playing || loading"
+						v-tooltip="
+							instance.quarantined
+								? 'This instance has been locked'
+								: playing
+									? 'Instance is already open'
+									: null
+						"
+						:disabled="instance.quarantined || playing || loading"
 						@click="play"
 					>
 						<SpinnerIcon v-if="loading" class="animate-spin" />
diff --git a/apps/app-frontend/src/components/ui/world/RecentWorldsList.vue b/apps/app-frontend/src/components/ui/world/RecentWorldsList.vue
index 09a44bc26..a5dec2e32 100644
--- a/apps/app-frontend/src/components/ui/world/RecentWorldsList.vue
+++ b/apps/app-frontend/src/components/ui/world/RecentWorldsList.vue
@@ -176,6 +176,7 @@ function refreshServer(address: string, instanceId: string) {
 }
 
 async function joinWorld(world: WorldWithInstance, instance?: GameInstance) {
+	if (instance?.quarantined) return
 	console.log(`Joining world ${getWorldIdentifier(world)}`)
 	if (world.type === 'server') {
 		await start_join_server(world.instance_id, world.address).catch(handleError)
@@ -192,6 +193,7 @@ async function joinWorld(world: WorldWithInstance, instance?: GameInstance) {
 }
 
 async function playInstance(instance: GameInstance) {
+	if (instance.quarantined) return
 	await run(instance.id)
 		.catch((err) => handleSevereError(err, { instanceId: instance.id }))
 		.finally(() => {
@@ -300,6 +302,7 @@ onUnmounted(() => {
 						item.world.type === 'singleplayer' &&
 						hasWorldQuickPlaySupport(gameVersions, item.instance.game_version || '')
 					"
+					:quarantined="item.instance.quarantined"
 					:server-status="
 						item.world.type === 'server' ? serverData[item.world.address].status : undefined
 					"
diff --git a/apps/app-frontend/src/components/ui/world/WorldItem.vue b/apps/app-frontend/src/components/ui/world/WorldItem.vue
index 3c3215dc1..5e509c57a 100644
--- a/apps/app-frontend/src/components/ui/world/WorldItem.vue
+++ b/apps/app-frontend/src/components/ui/world/WorldItem.vue
@@ -77,6 +77,7 @@ const props = withDefaults(
 		startingInstance?: boolean
 		supportsServerQuickPlay?: boolean
 		supportsWorldQuickPlay?: boolean
+		quarantined?: boolean
 		currentProtocol?: ProtocolVersion | null
 		highlighted?: boolean
 
@@ -105,6 +106,7 @@ const props = withDefaults(
 		startingInstance: false,
 		supportsServerQuickPlay: true,
 		supportsWorldQuickPlay: false,
+		quarantined: false,
 		currentProtocol: null,
 
 		refreshing: false,
@@ -139,7 +141,7 @@ const managed = computed(() => props.managed)
 const shortcutInstanceId = computed(() => props.shortcutInstanceId ?? props.instanceId)
 
 async function createShortcut() {
-	if (!shortcutInstanceId.value) return
+	if (!shortcutInstanceId.value || props.quarantined) return
 
 	try {
 		const shortcutPath = await createInstanceShortcut(
@@ -422,23 +424,26 @@ const messages = defineMessages({
 				<ButtonStyled v-else>
 					<button
 						v-tooltip="
-							world.type === 'server'
-								? !supportsServerQuickPlay
-									? formatMessage(messages.noServerQuickPlay)
-									: playingOtherWorld
-										? formatMessage(messages.gameAlreadyOpen)
-										: !serverStatus
-											? formatMessage(messages.noContact)
-											: serverIncompatible
-												? formatMessage(messages.incompatibleServer)
-												: null
-								: !supportsWorldQuickPlay
-									? formatMessage(messages.noSingleplayerQuickPlay)
-									: playingOtherWorld || locked
-										? formatMessage(messages.gameAlreadyOpen)
-										: null
+							quarantined
+								? 'This instance has been locked'
+								: world.type === 'server'
+									? !supportsServerQuickPlay
+										? formatMessage(messages.noServerQuickPlay)
+										: playingOtherWorld
+											? formatMessage(messages.gameAlreadyOpen)
+											: !serverStatus
+												? formatMessage(messages.noContact)
+												: serverIncompatible
+													? formatMessage(messages.incompatibleServer)
+													: null
+									: !supportsWorldQuickPlay
+										? formatMessage(messages.noSingleplayerQuickPlay)
+										: playingOtherWorld || locked
+											? formatMessage(messages.gameAlreadyOpen)
+											: null
 						"
 						:disabled="
+							quarantined ||
 							playingOtherWorld ||
 							startingInstance ||
 							(world.type == 'server' && !supportsServerQuickPlay) ||
@@ -457,7 +462,7 @@ const messages = defineMessages({
 							{
 								id: 'play-instance',
 								shown: !!instanceId,
-								disabled: playingInstance,
+								disabled: playingInstance || quarantined,
 								action: () => emit('play-instance'),
 							},
 							{
@@ -511,7 +516,7 @@ const messages = defineMessages({
 							},
 							{
 								id: 'create-shortcut',
-								shown: !!shortcutInstanceId,
+								shown: !!shortcutInstanceId && !quarantined,
 								action: () => createShortcut(),
 							},
 							{
diff --git a/apps/app-frontend/src/composables/browse/install-job-notifications.ts b/apps/app-frontend/src/composables/browse/install-job-notifications.ts
index 8d7eaa832..513c6a90e 100644
--- a/apps/app-frontend/src/composables/browse/install-job-notifications.ts
+++ b/apps/app-frontend/src/composables/browse/install-job-notifications.ts
@@ -53,6 +53,10 @@ const messages = defineMessages({
 		id: 'app.action-bar.install.unknown-instance',
 		defaultMessage: 'Unknown instance',
 	},
+	updatingSharedContent: {
+		id: 'app.action-bar.install.updating-shared-content',
+		defaultMessage: 'Updating shared content',
+	},
 })
 
 const phaseMessages = defineMessages({
@@ -268,6 +272,9 @@ export async function useInstallJobNotifications(opts: {
 				version: job.details.major_version,
 			})
 		}
+		if (job.kind === 'update_shared_instance' && job.phase === 'downloading_content') {
+			return formatMessage(messages.updatingSharedContent)
+		}
 		return formatMessage(phaseMessages[job.phase])
 	}
 
diff --git a/apps/app-frontend/src/composables/instances/use-managed-content-policy.ts b/apps/app-frontend/src/composables/instances/use-managed-content-policy.ts
new file mode 100644
index 000000000..937d7d97a
--- /dev/null
+++ b/apps/app-frontend/src/composables/instances/use-managed-content-policy.ts
@@ -0,0 +1,124 @@
+import { type ContentActionWarning, type ContentItem, defineMessages, useVIntl } from '@modrinth/ui'
+import { computed, type Ref } from 'vue'
+
+import type { GameInstance } from '@/helpers/types'
+
+const managedSourceKinds = new Set(['shared_instance', 'modrinth_modpack', 'imported_modpack'])
+
+export function useManagedContentPolicy(instance: Ref<GameInstance>) {
+	const { formatMessage } = useVIntl()
+	const isManagedModpack = computed(() => instance.value.shared_instance?.role === 'member')
+	const isQuarantined = computed(() => instance.value.quarantined)
+	const canUnpublish = computed(() => instance.value.shared_instance?.role === 'owner')
+	const canUnlink = computed(() => instance.value.shared_instance?.role === 'member')
+	const managedModpackWarning = computed(() => ({
+		admonitionHeader: formatMessage(messages.warningHeader),
+		changeVersionBody: formatMessage(messages.changeVersionBody),
+		unlinkBody: formatMessage(messages.unlinkBody),
+	}))
+
+	function isManagedContent(item: ContentItem) {
+		return (
+			isQuarantined.value ||
+			(isManagedModpack.value && !!item.source_kind && managedSourceKinds.has(item.source_kind))
+		)
+	}
+
+	function canMutateContent(item: ContentItem) {
+		return !isManagedContent(item)
+	}
+
+	function canUpdateContent(item: ContentItem) {
+		return (
+			canMutateContent(item) && !!item.file_path && !!item.has_update && !!item.update_version_id
+		)
+	}
+
+	function deleteWarning(items: ContentItem[]): ContentActionWarning | null {
+		if (!items.some(isManagedContent)) return null
+		return {
+			admonitionHeader: formatMessage(messages.warningHeader),
+			admonitionBody: formatMessage(
+				items.length === 1 ? messages.deleteSingleBody : messages.deleteBulkBody,
+			),
+			actionLabel: formatMessage(
+				items.length === 1 ? messages.deleteButton : messages.deleteManyButton,
+				{ count: items.length },
+			),
+		}
+	}
+
+	function disableWarning(items: ContentItem[]): ContentActionWarning | null {
+		if (!items.some(isManagedContent)) return null
+		return {
+			admonitionHeader: formatMessage(messages.warningHeader),
+			admonitionBody: formatMessage(
+				items.length === 1 ? messages.disableSingleBody : messages.disableBulkBody,
+			),
+			actionLabel: formatMessage(
+				items.length === 1 ? messages.disableButton : messages.disableManyButton,
+				{ count: items.length },
+			),
+		}
+	}
+
+	return {
+		isManagedModpack,
+		isQuarantined,
+		canUnpublish,
+		canUnlink,
+		managedModpackWarning,
+		isManagedContent,
+		canMutateContent,
+		canUpdateContent,
+		deleteWarning,
+		disableWarning,
+	}
+}
+
+const messages = defineMessages({
+	warningHeader: {
+		id: 'content.shared-instance.warning-header',
+		defaultMessage: 'This is part of the shared instance',
+	},
+	changeVersionBody: {
+		id: 'content.shared-instance.change-version-body',
+		defaultMessage:
+			'Changing the version only changes your local copy. Future shared instance updates may restore or change it again.',
+	},
+	unlinkBody: {
+		id: 'content.shared-instance.unlink-body',
+		defaultMessage:
+			'Unlinking only changes your local copy. Future shared instance updates may restore or change it again.',
+	},
+	deleteSingleBody: {
+		id: 'content.shared-instance.delete-single-body',
+		defaultMessage:
+			'Deleting it only changes your local copy. Future shared instance updates may restore or change it again.',
+	},
+	deleteBulkBody: {
+		id: 'content.shared-instance.delete-bulk-body',
+		defaultMessage:
+			'Some selected projects are part of the shared instance. Deleting them only changes your local copy, and future shared instance updates may restore or change them again.',
+	},
+	deleteButton: { id: 'content.shared-instance.delete-button', defaultMessage: 'Delete anyway' },
+	deleteManyButton: {
+		id: 'content.shared-instance.delete-many-button',
+		defaultMessage: 'Delete {count, number} projects anyway',
+	},
+	disableSingleBody: {
+		id: 'content.shared-instance.disable-single-body',
+		defaultMessage:
+			'Disabling it only changes your local copy. Future shared instance updates may re-enable, restore, or change it again.',
+	},
+	disableBulkBody: {
+		id: 'content.shared-instance.disable-bulk-body',
+		defaultMessage:
+			'Some selected projects are part of the shared instance. Disabling them only changes your local copy, and future shared instance updates may re-enable, restore, or change them again.',
+	},
+	disableButton: { id: 'content.shared-instance.disable-button', defaultMessage: 'Disable anyway' },
+	disableManyButton: {
+		id: 'content.shared-instance.disable-many-button',
+		defaultMessage: 'Disable {count, number} projects anyway',
+	},
+})
diff --git a/apps/app-frontend/src/composables/use-friends.ts b/apps/app-frontend/src/composables/use-friends.ts
new file mode 100644
index 000000000..0bec9cbb7
--- /dev/null
+++ b/apps/app-frontend/src/composables/use-friends.ts
@@ -0,0 +1,148 @@
+import { useMutation, useQuery, useQueryClient } from '@tanstack/vue-query'
+import { computed, type MaybeRefOrGetter, onUnmounted, toValue } from 'vue'
+
+import { toError } from '@/helpers/errors'
+import { friend_listener } from '@/helpers/events.js'
+import {
+	acceptCachedFriend,
+	add_friend,
+	createPendingFriend,
+	type FriendCacheUser,
+	friendsQueryKey,
+	type FriendWithUserData,
+	getFriendsWithUserData,
+	getFriendUserId,
+	matchesFriend,
+	remove_friend,
+	removeCachedFriend,
+	upsertCachedFriend,
+} from '@/helpers/friends'
+import type { ModrinthCredentials } from '@/helpers/mr_auth'
+
+type FriendsMutationContext = {
+	queryKey: ReturnType<typeof friendsQueryKey>
+	previousFriends?: FriendWithUserData[]
+}
+
+type AddFriendMutationVariables = {
+	userId: string
+	user: FriendCacheUser
+	acceptExisting: boolean
+}
+
+type RemoveFriendMutationVariables = {
+	userId: string
+	user: FriendWithUserData
+}
+
+export function useFriends(options: {
+	currentUserId: MaybeRefOrGetter<string | null | undefined>
+	getCredentials: () => ModrinthCredentials | null | Promise<ModrinthCredentials | null>
+	enabled?: MaybeRefOrGetter<boolean>
+	onError?: (error: Error) => void
+}) {
+	const queryClient = useQueryClient()
+	const queryKey = computed(() => friendsQueryKey(toValue(options.currentUserId)))
+	const query = useQuery({
+		queryKey,
+		queryFn: async () => getFriendsWithUserData(await options.getCredentials()),
+		enabled: () => !!toValue(options.currentUserId) && toValue(options.enabled ?? true),
+		staleTime: 30_000,
+	})
+	const friends = computed(() => query.data.value ?? [])
+
+	function restore(context?: FriendsMutationContext) {
+		if (!context) return
+		if (context.previousFriends === undefined) {
+			queryClient.removeQueries({ queryKey: context.queryKey, exact: true })
+			return
+		}
+		queryClient.setQueryData(context.queryKey, context.previousFriends)
+	}
+
+	const addMutation = useMutation({
+		mutationFn: ({ userId }: AddFriendMutationVariables) => add_friend(userId),
+		onMutate: async ({ user, acceptExisting }): Promise<FriendsMutationContext> => {
+			const activeQueryKey = queryKey.value
+			await queryClient.cancelQueries({ queryKey: activeQueryKey })
+			const previousFriends = queryClient.getQueryData<FriendWithUserData[]>(activeQueryKey)
+			const currentUserId = toValue(options.currentUserId)
+			queryClient.setQueryData<FriendWithUserData[]>(activeQueryKey, (cachedFriends = []) =>
+				acceptExisting
+					? acceptCachedFriend(cachedFriends, user.id, user.username, currentUserId)
+					: upsertCachedFriend(
+							cachedFriends,
+							createPendingFriend(user, currentUserId),
+							currentUserId,
+						),
+			)
+			return { queryKey: activeQueryKey, previousFriends }
+		},
+		onError: (error, _variables, context) => {
+			restore(context)
+			options.onError?.(toError(error))
+		},
+		onSettled: (_data, _error, _variables, context) => {
+			void queryClient.invalidateQueries({ queryKey: context?.queryKey ?? queryKey.value })
+		},
+	})
+
+	const removeMutation = useMutation({
+		mutationFn: ({ userId }: RemoveFriendMutationVariables) => remove_friend(userId),
+		onMutate: async ({ user, userId }): Promise<FriendsMutationContext> => {
+			const activeQueryKey = queryKey.value
+			await queryClient.cancelQueries({ queryKey: activeQueryKey })
+			const previousFriends = queryClient.getQueryData<FriendWithUserData[]>(activeQueryKey)
+			queryClient.setQueryData<FriendWithUserData[]>(activeQueryKey, (cachedFriends = []) =>
+				removeCachedFriend(cachedFriends, userId, user.username, toValue(options.currentUserId)),
+			)
+			return { queryKey: activeQueryKey, previousFriends }
+		},
+		onError: (error, _variables, context) => {
+			restore(context)
+			options.onError?.(toError(error))
+		},
+		onSettled: (_data, _error, _variables, context) => {
+			void queryClient.invalidateQueries({ queryKey: context?.queryKey ?? queryKey.value })
+		},
+	})
+
+	function requestFriend(user: FriendCacheUser, acceptExisting = false) {
+		addMutation.mutate({ userId: user.id, user, acceptExisting })
+	}
+
+	function acceptFriend(friend: FriendWithUserData) {
+		const userId = getFriendUserId(friend, toValue(options.currentUserId))
+		requestFriend({ id: userId, username: friend.username, avatarUrl: friend.avatar }, true)
+	}
+
+	function removeFriend(friend: FriendWithUserData) {
+		const userId = getFriendUserId(friend, toValue(options.currentUserId))
+		removeMutation.mutate({ userId, user: friend })
+	}
+
+	function findFriend(id: string, username: string) {
+		return friends.value.find((friend) =>
+			matchesFriend(friend, id, username, toValue(options.currentUserId)),
+		)
+	}
+
+	let unlisten: (() => void) | undefined
+	void friend_listener(() => {
+		void queryClient.invalidateQueries({ queryKey: queryKey.value })
+	}).then((listener) => {
+		unlisten = listener
+	})
+	onUnmounted(() => unlisten?.())
+
+	return {
+		query,
+		queryKey,
+		friends,
+		loading: computed(() => !!toValue(options.currentUserId) && query.isLoading.value),
+		requestFriend,
+		acceptFriend,
+		removeFriend,
+		findFriend,
+	}
+}
diff --git a/apps/app-frontend/src/composables/users/use-user-query.ts b/apps/app-frontend/src/composables/users/use-user-query.ts
new file mode 100644
index 000000000..6834a6721
--- /dev/null
+++ b/apps/app-frontend/src/composables/users/use-user-query.ts
@@ -0,0 +1,17 @@
+import { useQuery } from '@tanstack/vue-query'
+import { computed, type Ref } from 'vue'
+
+import { get_user } from '@/helpers/cache.js'
+
+export function useUserQuery(userId: Ref<string | null | undefined>) {
+	return useQuery({
+		queryKey: computed(() => ['user', userId.value]),
+		queryFn: async ({ queryKey }) => {
+			const id = queryKey[1]
+			if (typeof id !== 'string') return null
+			return await get_user(id, 'bypass').catch(() => null)
+		},
+		enabled: () => !!userId.value,
+		staleTime: 30_000,
+	})
+}
diff --git a/apps/app-frontend/src/config.ts b/apps/app-frontend/src/config.ts
index d9c6bf881..0abb86269 100644
--- a/apps/app-frontend/src/config.ts
+++ b/apps/app-frontend/src/config.ts
@@ -7,6 +7,9 @@ const labrinthBaseUrl = trimTrailingSlash(
 const archonBaseUrl = trimTrailingSlash(
 	import.meta.env.MODRINTH_ARCHON_BASE_URL || 'https://archon.modrinth.com',
 )
+const sharedInstancesBaseUrl = trimTrailingSlash(
+	import.meta.env.SHARED_INSTANCES_API_BASE_URL || 'https://shared-instances.modrinth.com',
+)
 
 export const config = {
 	siteUrl,
@@ -15,4 +18,5 @@ export const config = {
 		'pk_test_51JbFxJJygY5LJFfKV50mnXzz3YLvBVe2Gd1jn7ljWAkaBlRz3VQdxN9mXcPSrFbSqxwAb0svte9yhnsmm7qHfcWn00R611Ce7b',
 	labrinthBaseUrl,
 	archonBaseUrl,
+	sharedInstancesBaseUrl,
 }
diff --git a/apps/app-frontend/src/helpers/errors.ts b/apps/app-frontend/src/helpers/errors.ts
new file mode 100644
index 000000000..ab45f8550
--- /dev/null
+++ b/apps/app-frontend/src/helpers/errors.ts
@@ -0,0 +1,11 @@
+export function toError(error: unknown) {
+	if (error instanceof Error) return error
+	if (typeof error === 'string') return new Error(error)
+	if (error && typeof error === 'object') {
+		const record = error as Record<string, unknown>
+		const message = record.message ?? record.error
+		if (typeof message === 'string') return new Error(message)
+		return new Error(JSON.stringify(error))
+	}
+	return new Error(String(error))
+}
diff --git a/apps/app-frontend/src/helpers/friends.ts b/apps/app-frontend/src/helpers/friends.ts
index 7fd27b5a8..bba32aad9 100644
--- a/apps/app-frontend/src/helpers/friends.ts
+++ b/apps/app-frontend/src/helpers/friends.ts
@@ -6,6 +6,8 @@ import dayjs from 'dayjs'
 import { get_user_many } from '@/helpers/cache'
 import type { ModrinthCredentials } from '@/helpers/mr_auth'
 
+export const friendsQueryKey = (userId?: string | null) => ['friends', userId ?? null] as const
+
 export type UserStatus = {
 	user_id: string
 	instance_name: string | null
@@ -46,6 +48,111 @@ export type FriendWithUserData = {
 	online: boolean
 	avatar: string
 }
+
+export type FriendCacheUser = {
+	id: string
+	username: string
+	avatarUrl?: string | null
+}
+
+export async function getFriendsWithUserData(
+	credentials: ModrinthCredentials | null,
+): Promise<FriendWithUserData[]> {
+	if (!credentials) return []
+
+	const friendsList = await friends()
+	return await transformFriends(friendsList, credentials)
+}
+
+export function createPendingFriend(
+	user: FriendCacheUser,
+	currentUserId?: string | null,
+): FriendWithUserData {
+	return {
+		id: user.id,
+		friend_id: currentUserId ?? null,
+		status: null,
+		last_updated: null,
+		created: dayjs(),
+		username: user.username,
+		accepted: false,
+		online: false,
+		avatar: user.avatarUrl ?? '',
+	}
+}
+
+export function getFriendUserId(
+	friend: Pick<FriendWithUserData, 'id' | 'friend_id'>,
+	currentUserId?: string | null,
+) {
+	return friend.id === currentUserId && friend.friend_id ? friend.friend_id : friend.id
+}
+
+export function matchesFriend(
+	friend: FriendWithUserData,
+	id: string,
+	username: string,
+	currentUserId?: string | null,
+) {
+	const friendId = getFriendUserId(friend, currentUserId)
+	return (
+		normalizeFriendKey(friendId) === normalizeFriendKey(id) ||
+		normalizeFriendKey(friend.username) === normalizeFriendKey(username)
+	)
+}
+
+export function upsertCachedFriend(
+	friends: FriendWithUserData[],
+	friend: FriendWithUserData,
+	currentUserId?: string | null,
+) {
+	const existingFriend = friends.find((cachedFriend) =>
+		matchesFriend(cachedFriend, friend.id, friend.username, currentUserId),
+	)
+
+	if (!existingFriend) return [friend, ...friends]
+
+	return friends.map((cachedFriend) =>
+		matchesFriend(cachedFriend, friend.id, friend.username, currentUserId)
+			? {
+					...cachedFriend,
+					...friend,
+					id: cachedFriend.id,
+					friend_id: cachedFriend.friend_id,
+				}
+			: cachedFriend,
+	)
+}
+
+export function acceptCachedFriend(
+	friends: FriendWithUserData[],
+	id: string,
+	username: string,
+	currentUserId?: string | null,
+) {
+	return friends.map((friend) =>
+		matchesFriend(friend, id, username, currentUserId)
+			? {
+					...friend,
+					accepted: true,
+				}
+			: friend,
+	)
+}
+
+export function removeCachedFriend(
+	friends: FriendWithUserData[],
+	id: string,
+	username: string,
+	currentUserId?: string | null,
+) {
+	return friends.filter((friend) => !matchesFriend(friend, id, username, currentUserId))
+}
+
+export function normalizeFriendKey(value: string) {
+	return value.trim().toLowerCase()
+}
+
 export async function transformFriends(
 	friends: UserFriend[],
 	credentials: ModrinthCredentials | null,
diff --git a/apps/app-frontend/src/helpers/install.ts b/apps/app-frontend/src/helpers/install.ts
index ee0f3f2d8..69d608fd7 100644
--- a/apps/app-frontend/src/helpers/install.ts
+++ b/apps/app-frontend/src/helpers/install.ts
@@ -45,6 +45,92 @@ export interface InstallPostInstallEdit {
 	link?: InstanceLink | null
 }
 
+export interface SharedInstanceInstallPreview {
+	sharedInstanceId: string
+	version: number
+	name: string
+	iconUrl?: string | null
+	gameVersion: string
+	loader: InstanceLoader
+	modCount: number
+	externalFileCount: number
+	modpackVersionId?: string | null
+	contentVersionIds: string[]
+	externalFiles: SharedInstanceExternalFilePreview[]
+}
+
+export interface SharedInstanceInviteInstallPreview {
+	sharedInstanceId: string
+	managerId?: string | null
+	serverManagerName?: string | null
+	serverManagerIconUrl?: string | null
+	instanceIconUrl?: string | null
+	preview: SharedInstanceInstallPreview
+}
+
+export interface SharedInstanceExternalFilePreview {
+	fileName: string
+	fileType: string
+}
+
+export interface SharedInstanceUpdatePreview {
+	sharedInstanceId: string
+	currentVersion?: number | null
+	latestVersion: number
+	updateAvailable: boolean
+	diffs: SharedInstanceUpdateDiff[]
+}
+
+export interface SharedInstanceUpdateDiff {
+	type:
+		| 'added'
+		| 'removed'
+		| 'updated'
+		| 'modpack_linked'
+		| 'modpack_updated'
+		| 'modpack_unlinked'
+		| 'game_version_updated'
+		| 'loader_updated'
+		| 'config_files_updated'
+	projectId?: string | null
+	projectName?: string | null
+	fileName?: string | null
+	currentVersionName?: string | null
+	newVersionName?: string | null
+	configFileCount?: number | null
+	disabled?: boolean
+}
+
+export const SHARED_INSTANCE_UNAVAILABLE_ERROR_CODE = 'shared_instance_unavailable'
+
+export type SharedInstanceUnavailableReason = 'deleted' | 'access_revoked' | 'quarantined'
+
+function isRecord(value: unknown): value is Record<string, unknown> {
+	return typeof value === 'object' && value !== null
+}
+
+export function isSharedInstanceUnavailableError(error: unknown) {
+	return getSharedInstanceUnavailableReason(error) !== null
+}
+
+export function getSharedInstanceUnavailableReason(
+	error: unknown,
+): SharedInstanceUnavailableReason | null {
+	if (!isRecord(error) || error.code !== SHARED_INSTANCE_UNAVAILABLE_ERROR_CODE) return null
+	return error.reason === 'deleted' ||
+		error.reason === 'access_revoked' ||
+		error.reason === 'quarantined'
+		? error.reason
+		: null
+}
+
+export function getErrorMessage(error: unknown): string {
+	if (typeof error === 'string') return error
+	if (error instanceof Error) return error.message || 'Unknown error'
+	if (isRecord(error) && typeof error.message === 'string') return error.message
+	return 'Unknown error'
+}
+
 export type InstallJobStatus =
 	| 'queued'
 	| 'running'
@@ -90,6 +176,7 @@ export interface InstallErrorView {
 	code: string
 	phase?: InstallPhaseId | null
 	message: string
+	reason?: SharedInstanceUnavailableReason | null
 	api?: {
 		error: string
 		status?: number | null
@@ -122,6 +209,8 @@ export interface InstallJobSnapshot {
 	kind:
 		| 'create_instance'
 		| 'create_modpack_instance'
+		| 'create_shared_instance'
+		| 'update_shared_instance'
 		| 'import_instance'
 		| 'duplicate_instance'
 		| 'install_existing_instance'
@@ -172,6 +261,58 @@ export async function install_create_modpack_instance(
 	})
 }
 
+export async function install_get_shared_instance_preview(sharedInstanceId: string, name: string) {
+	return await invoke<SharedInstanceInstallPreview>(
+		'plugin:install|install_get_shared_instance_preview',
+		{
+			sharedInstanceId,
+			name,
+		},
+	)
+}
+
+export async function install_accept_shared_instance_invite(inviteId: string) {
+	return await invoke<SharedInstanceInviteInstallPreview>(
+		'plugin:install|install_accept_shared_instance_invite',
+		{
+			inviteId,
+		},
+	)
+}
+
+export async function install_get_shared_instance_update_preview(instanceId: string) {
+	return await invoke<SharedInstanceUpdatePreview | null>(
+		'plugin:install|install_get_shared_instance_update_preview',
+		{
+			instanceId,
+		},
+	)
+}
+
+export async function install_shared_instance(
+	sharedInstanceId: string,
+	name: string,
+	managerId?: string | null,
+	serverManagerName?: string | null,
+	serverManagerIconUrl?: string | null,
+	instanceIconUrl?: string | null,
+) {
+	return await invoke<InstallJobSnapshot>('plugin:install|install_shared_instance', {
+		sharedInstanceId,
+		name,
+		managerId,
+		serverManagerName,
+		serverManagerIconUrl,
+		instanceIconUrl,
+	})
+}
+
+export async function install_update_shared_instance(instanceId: string) {
+	return await invoke<InstallJobSnapshot>('plugin:install|install_update_shared_instance', {
+		instanceId,
+	})
+}
+
 export async function install_import_instance(
 	launcherType: string,
 	basePath: string,
@@ -249,7 +390,8 @@ export function isInstallJobFinished(status: InstallJobStatus) {
 function settleInstallJob(job: InstallJobSnapshot) {
 	if (job.status === 'succeeded') return job
 
-	throw new Error(job.error?.message ?? `Install job ${job.job_id} ${job.status}`)
+	if (job.error) throw job.error
+	throw new Error(`Install job ${job.job_id} ${job.status}`)
 }
 
 export async function wait_for_install_job(jobId: string) {
diff --git a/apps/app-frontend/src/helpers/instance.ts b/apps/app-frontend/src/helpers/instance.ts
index 3a7a1b567..caf54aa46 100644
--- a/apps/app-frontend/src/helpers/instance.ts
+++ b/apps/app-frontend/src/helpers/instance.ts
@@ -7,13 +7,14 @@ import type { Labrinth } from '@modrinth/api-client'
 import type { ContentItem, ContentOwner } from '@modrinth/ui'
 import { invoke } from '@tauri-apps/api/core'
 
-import type { InstallJobSnapshot } from './install'
+import type { InstallJobSnapshot, SharedInstanceUpdateDiff } from './install'
 import type {
 	CacheBehaviour,
 	ContentFile,
 	ContentFileProjectType,
 	GameInstance,
 	InstanceLoader,
+	SharedInstanceAttachment,
 } from './types'
 
 export async function remove(instanceId: string): Promise<void> {
@@ -335,3 +336,93 @@ export async function edit(instanceId: string, editInstance: Partial<GameInstanc
 export async function edit_icon(instanceId: string, iconPath: string | null): Promise<void> {
 	return await invoke('plugin:instance|instance_edit_icon', { instanceId, iconPath })
 }
+
+export type SharedInstanceUsers = {
+	user_ids: string[]
+	users: SharedInstanceUser[]
+	tokens: number
+}
+
+export type SharedInstanceJoinType = 'owner' | 'invite' | 'link'
+
+export type SharedInstanceUser = {
+	id: string
+	joined_at?: string | null
+	join_type: SharedInstanceJoinType
+	last_played?: string | null
+}
+
+export interface SharedInstancePublishPreview {
+	sharedInstanceId: string
+	latestVersion: number
+	diffs: SharedInstanceUpdateDiff[]
+	configFiles: string[]
+}
+
+export interface SharedInstanceInviteLink {
+	inviteId: string
+	expiresAt: string
+	maxUses: number
+}
+
+export async function can_current_user_use_shared_instances(): Promise<boolean> {
+	return await invoke('plugin:instance|instance_share_can_current_user_use')
+}
+
+export async function get_shared_instance_users(instanceId: string): Promise<SharedInstanceUsers> {
+	return await invoke('plugin:instance|instance_share_get_users', { instanceId })
+}
+
+export async function invite_shared_instance_users(
+	instanceId: string,
+	userIds: string[],
+): Promise<SharedInstanceUsers> {
+	return await invoke('plugin:instance|instance_share_invite_users', { instanceId, userIds })
+}
+
+export async function create_shared_instance_invite_link(
+	instanceId: string,
+	options: {
+		maxAgeSeconds?: number
+		maxUses?: number
+		replaceInviteId?: string
+	} = {},
+): Promise<SharedInstanceInviteLink> {
+	return await invoke('plugin:instance|instance_share_create_invite_link', {
+		instanceId,
+		...options,
+	})
+}
+
+export async function remove_shared_instance_users(
+	instanceId: string,
+	userIds: string[],
+	hasPendingRecipients: boolean,
+): Promise<SharedInstanceUsers> {
+	return await invoke('plugin:instance|instance_share_remove_users', {
+		instanceId,
+		userIds,
+		hasPendingRecipients,
+	})
+}
+
+export async function get_shared_instance_publish_preview(
+	instanceId: string,
+): Promise<SharedInstancePublishPreview | null> {
+	return await invoke('plugin:instance|instance_share_get_publish_preview', { instanceId })
+}
+
+export async function publish_shared_instance(
+	instanceId: string,
+	configPaths: string[],
+): Promise<SharedInstanceAttachment> {
+	return await invoke('plugin:instance|instance_share_publish', { instanceId, configPaths })
+}
+
+export async function unlink_shared_instance(instanceId: string): Promise<void> {
+	return await invoke('plugin:instance|instance_share_unlink', { instanceId })
+}
+
+export async function unpublish_shared_instance(instanceId: string): Promise<void> {
+	return await invoke('plugin:instance|instance_share_unpublish', { instanceId })
+}
diff --git a/apps/app-frontend/src/helpers/mr_auth.ts b/apps/app-frontend/src/helpers/mr_auth.ts
index d28ad63db..111b1f088 100644
--- a/apps/app-frontend/src/helpers/mr_auth.ts
+++ b/apps/app-frontend/src/helpers/mr_auth.ts
@@ -12,8 +12,10 @@ export type ModrinthCredentials = {
 	active: boolean
 }
 
-export async function login(): Promise<ModrinthCredentials> {
-	return await invoke('plugin:mr-auth|modrinth_login')
+export type ModrinthAuthFlow = 'sign-in' | 'sign-up'
+
+export async function login(flow: ModrinthAuthFlow = 'sign-in'): Promise<ModrinthCredentials> {
+	return await invoke('plugin:mr-auth|modrinth_login', { flow })
 }
 
 export async function logout(): Promise<void> {
diff --git a/apps/app-frontend/src/helpers/reports.ts b/apps/app-frontend/src/helpers/reports.ts
new file mode 100644
index 000000000..8f396ba0c
--- /dev/null
+++ b/apps/app-frontend/src/helpers/reports.ts
@@ -0,0 +1,19 @@
+import { invoke } from '@tauri-apps/api/core'
+
+export type ReportItemType = 'project' | 'version' | 'user' | 'shared-instance'
+
+export interface CreateReportRequest {
+	report_type: string
+	item_id: string
+	item_type: ReportItemType
+	body: string
+	uploaded_images: string[]
+}
+
+export interface CreateReportResponse {
+	id: string
+}
+
+export async function create_report(request: CreateReportRequest) {
+	return await invoke<CreateReportResponse>('plugin:reports|reports_create', { request })
+}
diff --git a/apps/app-frontend/src/helpers/shared-instance-errors.ts b/apps/app-frontend/src/helpers/shared-instance-errors.ts
new file mode 100644
index 000000000..e1e92efca
--- /dev/null
+++ b/apps/app-frontend/src/helpers/shared-instance-errors.ts
@@ -0,0 +1,98 @@
+import { defineMessages, injectNotificationManager, useVIntl } from '@modrinth/ui'
+
+import { getErrorMessage, type SharedInstanceUnavailableReason } from '@/helpers/install'
+
+export const sharedInstanceErrorMessages = defineMessages({
+	unavailableTitle: {
+		id: 'instance.shared-instance.unavailable.title',
+		defaultMessage: 'Shared instance no longer available',
+	},
+	lockedTitle: {
+		id: 'instance.shared-instance.unavailable.locked-title',
+		defaultMessage: 'Instance locked',
+	},
+	unavailableText: {
+		id: 'instance.shared-instance.unavailable.text',
+		defaultMessage:
+			"Your local instance is still available, but it is no longer linked and won't receive updates.",
+	},
+	deletedText: {
+		id: 'instance.shared-instance.unavailable.deleted-text',
+		defaultMessage:
+			'The primary instance was deleted. This instance is still available, but it is no longer linked and will no longer receive updates.',
+	},
+	accessRevokedText: {
+		id: 'instance.shared-instance.unavailable.access-revoked-text',
+		defaultMessage:
+			'Your access to the shared instance was revoked. This instance is still available, but it is no longer linked and will no longer receive updates.',
+	},
+	lockedText: {
+		id: 'instance.shared-instance.unavailable.locked-text',
+		defaultMessage:
+			'This shared instance was locked by the Content Moderation team. It will no longer receive updates from the primary instance and cannot be played.',
+	},
+	unavailableFallbackManager: {
+		id: 'instance.shared-instance.unavailable.manager-fallback',
+		defaultMessage: 'the instance manager',
+	},
+	errorTitle: {
+		id: 'instance.shared-instance.error.title',
+		defaultMessage: 'Something has gone wrong',
+	},
+})
+
+export function sharedInstanceUnavailableTextMessage(
+	reason: SharedInstanceUnavailableReason | null,
+) {
+	if (reason === 'deleted') return sharedInstanceErrorMessages.deletedText
+	if (reason === 'access_revoked') return sharedInstanceErrorMessages.accessRevokedText
+	if (reason === 'quarantined') return sharedInstanceErrorMessages.lockedText
+	return sharedInstanceErrorMessages.unavailableText
+}
+
+export function sharedInstanceUnavailableTitleMessage(
+	reason: SharedInstanceUnavailableReason | null,
+) {
+	return reason === 'quarantined'
+		? sharedInstanceErrorMessages.lockedTitle
+		: sharedInstanceErrorMessages.unavailableTitle
+}
+
+export function useSharedInstanceErrors() {
+	const { formatMessage } = useVIntl()
+	const { addNotification } = injectNotificationManager()
+
+	function formatSharedInstanceUnavailable(
+		reason: SharedInstanceUnavailableReason | null = null,
+		manager?: string | null,
+	) {
+		return formatMessage(sharedInstanceUnavailableTextMessage(reason), {
+			manager: manager || formatMessage(sharedInstanceErrorMessages.unavailableFallbackManager),
+		})
+	}
+
+	function notifySharedInstanceUnavailable(
+		reason: SharedInstanceUnavailableReason | null = null,
+		manager?: string | null,
+	) {
+		addNotification({
+			type: 'warning',
+			title: formatMessage(sharedInstanceUnavailableTitleMessage(reason)),
+			text: formatSharedInstanceUnavailable(reason, manager),
+		})
+	}
+
+	function notifySharedInstanceError(error: unknown) {
+		addNotification({
+			type: 'error',
+			title: formatMessage(sharedInstanceErrorMessages.errorTitle),
+			text: getErrorMessage(error),
+		})
+	}
+
+	return {
+		formatSharedInstanceUnavailable,
+		notifySharedInstanceError,
+		notifySharedInstanceUnavailable,
+	}
+}
diff --git a/apps/app-frontend/src/helpers/types.d.ts b/apps/app-frontend/src/helpers/types.d.ts
index 761226eb9..d451e649a 100644
--- a/apps/app-frontend/src/helpers/types.d.ts
+++ b/apps/app-frontend/src/helpers/types.d.ts
@@ -17,6 +17,8 @@ export type GameInstance = {
 	groups: string[]
 
 	link?: InstanceLink | null
+	shared_instance?: SharedInstanceAttachment | null
+	quarantined: boolean
 	update_channel: ReleaseChannel
 
 	created: Date
@@ -86,18 +88,47 @@ export type InstanceLink = InstanceLinkIdentity &
 		  }
 		| {
 				type: 'shared_instance'
-				shared_instance_id: string
+				modpack_project_id?: ModrinthId | null
+				modpack_version_id?: ModrinthId | null
 		  }
 	)
 
+export type SharedInstanceAttachment = {
+	id: string
+	role: 'owner' | 'member'
+	manager_id?: string | null
+	server_manager_name?: string | null
+	server_manager_icon_url?: string | null
+	linked_user_id?: string | null
+	status:
+		| 'unknown'
+		| 'up_to_date'
+		| 'update_available'
+		| 'applying'
+		| 'stale'
+		| 'not_ready'
+		| 'error'
+	applied_version?: number | null
+	latest_version?: number | null
+}
+
 export type Instance = GameInstance
 
 type ReleaseChannel = 'release' | 'beta' | 'alpha'
 
 export type InstanceLoader = 'vanilla' | 'forge' | 'fabric' | 'quilt' | 'neoforge'
 
+export type ContentSourceKind =
+	| 'local'
+	| 'modrinth_modpack'
+	| 'server_project'
+	| 'modrinth_hosting'
+	| 'imported_modpack'
+	| 'shared_instance'
+
 type ContentFile = {
 	enabled: boolean
+	source_kind?: ContentSourceKind | null
 	metadata?: {
 		project_id: string
 		version_id: string
diff --git a/apps/app-frontend/src/helpers/users.ts b/apps/app-frontend/src/helpers/users.ts
new file mode 100644
index 000000000..042b0d4cb
--- /dev/null
+++ b/apps/app-frontend/src/helpers/users.ts
@@ -0,0 +1,11 @@
+import { invoke } from '@tauri-apps/api/core'
+
+export type SearchUser = {
+	id: string
+	username: string
+	avatar_url: string | null
+}
+
+export async function search_user(query: string): Promise<SearchUser[]> {
+	return await invoke<SearchUser[]>('plugin:users|search_user', { query })
+}
diff --git a/apps/app-frontend/src/locales/de-CH/index.json b/apps/app-frontend/src/locales/de-CH/index.json
index 51aae4b29..6f36de84e 100644
--- a/apps/app-frontend/src/locales/de-CH/index.json
+++ b/apps/app-frontend/src/locales/de-CH/index.json
@@ -425,9 +425,6 @@
   "app.instance.worlds.search-worlds-placeholder": {
     "message": "Durchsuche {count} Welten..."
   },
-  "app.modal.install-to-play.dont-install": {
-    "message": "Nicht Installieren"
-  },
   "app.modal.install-to-play.header": {
     "message": "Installieren zum Spielen"
   },
diff --git a/apps/app-frontend/src/locales/de-DE/index.json b/apps/app-frontend/src/locales/de-DE/index.json
index 91708c9c4..a822a2391 100644
--- a/apps/app-frontend/src/locales/de-DE/index.json
+++ b/apps/app-frontend/src/locales/de-DE/index.json
@@ -425,9 +425,6 @@
   "app.instance.worlds.search-worlds-placeholder": {
     "message": "Durchsuche {count} Welten..."
   },
-  "app.modal.install-to-play.dont-install": {
-    "message": "Nicht Installieren"
-  },
   "app.modal.install-to-play.header": {
     "message": "Installieren zum Spielen"
   },
diff --git a/apps/app-frontend/src/locales/en-US/index.json b/apps/app-frontend/src/locales/en-US/index.json
index 8a70ed4e1..66f9fe60c 100644
--- a/apps/app-frontend/src/locales/en-US/index.json
+++ b/apps/app-frontend/src/locales/en-US/index.json
@@ -89,6 +89,9 @@
   "app.action-bar.install.unknown-instance": {
     "message": "Unknown instance"
   },
+  "app.action-bar.install.updating-shared-content": {
+    "message": "Updating shared content"
+  },
   "app.action-bar.installs": {
     "message": "Installs"
   },
@@ -338,6 +341,36 @@
   "app.install.phase.running_loader_processors": {
     "message": "Running loader processors"
   },
+  "app.instance.admonitions.shared-instance.added-label": {
+    "message": "Added"
+  },
+  "app.instance.admonitions.shared-instance.changes-body": {
+    "message": "Your local instance is ahead of the users you've shared it with."
+  },
+  "app.instance.admonitions.shared-instance.changes-header": {
+    "message": "Your changes haven't been shared yet"
+  },
+  "app.instance.admonitions.shared-instance.publish-button": {
+    "message": "Push update"
+  },
+  "app.instance.admonitions.shared-instance.publishing-button": {
+    "message": "Pushing..."
+  },
+  "app.instance.admonitions.shared-instance.removed-label": {
+    "message": "Removed"
+  },
+  "app.instance.admonitions.shared-instance.review-admonition-header": {
+    "message": "Push update"
+  },
+  "app.instance.admonitions.shared-instance.review-description": {
+    "message": "Review the content changes that will be shared with everyone using this instance."
+  },
+  "app.instance.admonitions.shared-instance.review-header": {
+    "message": "Review changes"
+  },
+  "app.instance.admonitions.shared-instance.reviewing-button": {
+    "message": "Reviewing..."
+  },
   "app.instance.confirm-delete.admonition-body": {
     "message": "All data for your instance will be permanently deleted, including your worlds, configs, and all installed content."
   },
@@ -374,6 +407,9 @@
   "app.instance.mods.content-type-project": {
     "message": "project"
   },
+  "app.instance.mods.locked-content": {
+    "message": "Content in locked instances cannot be changed."
+  },
   "app.instance.mods.project-was-added": {
     "message": "\"{name}\" was added"
   },
@@ -389,6 +425,102 @@
   "app.instance.mods.successfully-uploaded": {
     "message": "Successfully uploaded"
   },
+  "app.instance.share.empty.description": {
+    "message": "You can share this instance with your friends!"
+  },
+  "app.instance.share.empty.heading": {
+    "message": "No friends invited"
+  },
+  "app.instance.share.empty.invite-friends-button": {
+    "message": "Invite friends"
+  },
+  "app.instance.share.invite-modal.heading": {
+    "message": "Share {name}"
+  },
+  "app.instance.share.locked.empty-description-prefix": {
+    "message": "You need to sign in as"
+  },
+  "app.instance.share.locked.empty-description-suffix": {
+    "message": "to access this page."
+  },
+  "app.instance.share.locked.linked-account-fallback": {
+    "message": "the linked account"
+  },
+  "app.instance.share.locked.signed-out-heading": {
+    "message": "Not signed in"
+  },
+  "app.instance.share.locked.switch-account-button": {
+    "message": "Switch account"
+  },
+  "app.instance.share.locked.wrong-account-heading": {
+    "message": "Wrong account"
+  },
+  "app.instance.share.remove-user-modal.effect-access": {
+    "message": "They will no longer receive updates for this shared instance"
+  },
+  "app.instance.share.remove-user-modal.effect-installed-copy": {
+    "message": "Any copy they already installed will stay on their device"
+  },
+  "app.instance.share.remove-user-modal.effect-invite-again": {
+    "message": "You can invite them again later"
+  },
+  "app.instance.share.remove-user-modal.effect-last-user": {
+    "message": "This is the last user, sharing will be turned off for this instance"
+  },
+  "app.instance.share.remove-user-modal.effects-label": {
+    "message": "What happens?"
+  },
+  "app.instance.share.remove-user-modal.header": {
+    "message": "Revoke access"
+  },
+  "app.instance.share.remove-user-modal.remove-button": {
+    "message": "Revoke access"
+  },
+  "app.instance.share.remove-user-modal.user-avatar-alt": {
+    "message": "{username}'s avatar"
+  },
+  "app.instance.share.remove-user-modal.warning-body": {
+    "message": "If you revoke {username}'s access to this shared instance, you'll need to invite them again before they can receive updates."
+  },
+  "app.instance.share.sign-in.button": {
+    "message": "Sign in"
+  },
+  "app.instance.share.unlink.body": {
+    "message": "You must unlink this modpack to share your instance"
+  },
+  "app.instance.share.unlink.header": {
+    "message": "Sharing requires unlinking"
+  },
+  "app.instance.shared-instance-already-installed.body": {
+    "message": "This shared instance is already installed as <bold>{instanceName}</bold>. Are you sure you want to install another copy?"
+  },
+  "app.instance.shared-instance-already-installed.header": {
+    "message": "Shared instance already installed"
+  },
+  "app.instance.shared-instance-already-installed.install-anyway": {
+    "message": "Install anyway"
+  },
+  "app.instance.shared-instance-already-installed.instance": {
+    "message": "Instance"
+  },
+  "app.instance.shared-instance-wrong-account.fallback-username": {
+    "message": "the linked account"
+  },
+  "app.instance.shared-instance-wrong-account.owner-admonition-body-v2": {
+    "message": "to manage this shared instance. You won't be able to push updates to users."
+  },
+  "app.instance.shared-instance-wrong-account.sign-in-as-label": {
+    "message": "Sign in as"
+  },
+  "app.instance.shared-instance-wrong-account.signed-out-header": {
+    "message": "You need to sign in to Modrinth"
+  },
+  "app.instance.shared-instance-wrong-account.user-admonition-body-v2": {
+    "message": "to receive updates for this shared instance."
+  },
+  "app.instance.shared-instance-wrong-account.warning-header": {
+    "message": "You are using the wrong Modrinth account"
+  },
   "app.instance.worlds.add-server": {
     "message": "Add server"
   },
@@ -440,8 +572,20 @@
   "app.instance.worlds.search-worlds-placeholder": {
     "message": "Search {count} worlds..."
   },
-  "app.modal.install-to-play.dont-install": {
-    "message": "Dont install"
+  "app.modal.install-to-play.additional-context": {
+    "message": "Additional context"
+  },
+  "app.modal.install-to-play.additional-context-placeholder": {
+    "message": "Include links and images if possible and relevant"
+  },
+  "app.modal.install-to-play.content-you-are-reporting": {
+    "message": "Instance you’re reporting"
+  },
+  "app.modal.install-to-play.delete-instance": {
+    "message": "Delete instance"
+  },
+  "app.modal.install-to-play.external-files-dont-install": {
+    "message": "Don't install"
   },
   "app.modal.install-to-play.header": {
     "message": "Install to play"
@@ -458,12 +602,51 @@
   "app.modal.install-to-play.mod-count": {
     "message": "{count, plural, one {# mod} other {# mods}}"
   },
+  "app.modal.install-to-play.report-description": {
+    "message": "Use this form to report instances that may violate our <rules-link>Rules</rules-link> or <terms-link>Terms of Use</terms-link>."
+  },
+  "app.modal.install-to-play.report-image-invalid-type": {
+    "message": "File is not an accepted image type"
+  },
+  "app.modal.install-to-play.report-image-too-large": {
+    "message": "File exceeds the 1 MiB size limit"
+  },
+  "app.modal.install-to-play.report-legal-claims": {
+    "message": "For DMCA notices or other legal claims, see our <copyright-link>Copyright Policy</copyright-link>."
+  },
+  "app.modal.install-to-play.report-reason": {
+    "message": "Which rule does this instance violate?"
+  },
+  "app.modal.install-to-play.report-reason.inappropriate": {
+    "message": "Inappropriate"
+  },
+  "app.modal.install-to-play.report-reason.malicious": {
+    "message": "Malicious"
+  },
+  "app.modal.install-to-play.report-reason.spam": {
+    "message": "Spam"
+  },
+  "app.modal.install-to-play.report-shared-instance-header": {
+    "message": "Report shared instance"
+  },
+  "app.modal.install-to-play.report-submitted": {
+    "message": "Report submitted"
+  },
+  "app.modal.install-to-play.report-support-and-bugs": {
+    "message": "For support requests, contact our <support-link>support team</support-link>. For bug reports, open a <github-link>GitHub issue</github-link>."
+  },
   "app.modal.install-to-play.reviewed-files": {
     "message": "A file is only reviewed if it’s published to Modrinth, regardless of its file format (including .mrpack)."
   },
   "app.modal.install-to-play.shared-instance": {
     "message": "Shared instance"
   },
+  "app.modal.install-to-play.shared-instance-content": {
+    "message": "Shared instance content"
+  },
+  "app.modal.install-to-play.shared-instance-unknown-files-description": {
+    "message": "This shared instance contains files that aren’t published on Modrinth. We strongly recommend only installing files from sources you trust."
+  },
   "app.modal.install-to-play.unknown-files-description": {
     "message": "This server modpack contains files that aren’t published on Modrinth. We strongly recommend only installing files from sources you trust."
   },
@@ -482,8 +665,23 @@
   "app.modal.update-to-play.removed": {
     "message": "Removed"
   },
+  "app.modal.update-to-play.server-modpack-unknown-files-description": {
+    "message": "This server modpack update contains files that aren’t published on Modrinth. We strongly recommend only installing files from sources you trust."
+  },
+  "app.modal.update-to-play.shared-instance-added-label": {
+    "message": "Added"
+  },
+  "app.modal.update-to-play.shared-instance-removed-label": {
+    "message": "Removed"
+  },
+  "app.modal.update-to-play.shared-instance-unknown-files-description": {
+    "message": "This shared instance update contains files that aren’t published on Modrinth. We strongly recommend only installing files from sources you trust."
+  },
+  "app.modal.update-to-play.update-required": {
+    "message": "Update required"
+  },
   "app.modal.update-to-play.update-required-description": {
-    "message": "An update is required to play {name}. Please update to the latest version to launch the game."
+    "message": "An update is required to play {name}. Please update to latest version to launch the game."
   },
   "app.project.install-button.already-installed": {
     "message": "This project is already installed"
@@ -740,6 +938,39 @@
   "app.world.world-item.players-online": {
     "message": "{count} online"
   },
+  "content.shared-instance.change-version-body": {
+    "message": "Changing the version only changes your local copy. Future shared instance updates may restore or change it again."
+  },
+  "content.shared-instance.delete-bulk-body": {
+    "message": "Some selected projects are part of the shared instance. Deleting them only changes your local copy, and future shared instance updates may restore or change them again."
+  },
+  "content.shared-instance.delete-button": {
+    "message": "Delete anyway"
+  },
+  "content.shared-instance.delete-many-button": {
+    "message": "Delete {count, number} projects anyway"
+  },
+  "content.shared-instance.delete-single-body": {
+    "message": "Deleting it only changes your local copy. Future shared instance updates may restore or change it again."
+  },
+  "content.shared-instance.disable-bulk-body": {
+    "message": "Some selected projects are part of the shared instance. Disabling them only changes your local copy, and future shared instance updates may re-enable, restore, or change them again."
+  },
+  "content.shared-instance.disable-button": {
+    "message": "Disable anyway"
+  },
+  "content.shared-instance.disable-many-button": {
+    "message": "Disable {count, number} projects anyway"
+  },
+  "content.shared-instance.disable-single-body": {
+    "message": "Disabling it only changes your local copy. Future shared instance updates may re-enable, restore, or change it again."
+  },
+  "content.shared-instance.unlink-body": {
+    "message": "Unlinking only changes your local copy. Future shared instance updates may restore or change it again."
+  },
+  "content.shared-instance.warning-header": {
+    "message": "This is part of the shared instance"
+  },
   "friends.action.add-friend": {
     "message": "Add a friend"
   },
@@ -803,6 +1034,48 @@
   "friends.sign-in-to-add-friends": {
     "message": "<link>Sign in to a Modrinth account</link> to add friends and see what they're playing!"
   },
+  "installation-settings.shared-instance.linked-title": {
+    "message": "Linked shared instance"
+  },
+  "installation-settings.shared-instance.title": {
+    "message": "Unpublish instance"
+  },
+  "installation-settings.shared-instance.unlink-button": {
+    "message": "Unlink shared instance"
+  },
+  "installation-settings.shared-instance.unlink-description": {
+    "message": "Disconnect this local instance from future shared updates."
+  },
+  "installation-settings.shared-instance.unlinking-button": {
+    "message": "Unlinking..."
+  },
+  "installation-settings.shared-instance.unpublish-button": {
+    "message": "Unpublish shared instance"
+  },
+  "installation-settings.shared-instance.unpublish-description": {
+    "message": "Remove this shared instance from Modrinth and stop sending updates to anyone using it. Your local instance will not be affected."
+  },
+  "installation-settings.shared-instance.unpublishing-button": {
+    "message": "Unpublishing..."
+  },
+  "installation-settings.unlink-shared-instance.modal.admonition-body": {
+    "message": "This only affects your local instance. Your installed content will stay on this device, and the shared instance and other people using it will not be affected."
+  },
+  "installation-settings.unlink-shared-instance.modal.admonition-header": {
+    "message": "Unlinking shared instance"
+  },
+  "installation-settings.unlink-shared-instance.modal.header": {
+    "message": "Unlink shared instance"
+  },
+  "installation-settings.unpublish-shared-instance.modal.admonition-body": {
+    "message": "This deletes the shared instance from Modrinth's servers. People using it in the Modrinth App will stop receiving updates, but your local instance and its content will stay on this device."
+  },
+  "installation-settings.unpublish-shared-instance.modal.admonition-header": {
+    "message": "Unpublishing shared instance"
+  },
+  "installation-settings.unpublish-shared-instance.modal.header": {
+    "message": "Unpublish shared instance"
+  },
   "instance.action.create-shortcut": {
     "message": "Create shortcut"
   },
@@ -872,6 +1145,12 @@
   "instance.files.save-as": {
     "message": "Save as..."
   },
+  "instance.locked.delete-button": {
+    "message": "Delete instance"
+  },
+  "instance.locked.play-tooltip": {
+    "message": "This instance has been locked"
+  },
   "instance.playtime.never-played": {
     "message": "Never played"
   },
@@ -1010,6 +1289,9 @@
   "instance.settings.tabs.installation.loader-version": {
     "message": "{loader} version"
   },
+  "instance.settings.tabs.installation.locked": {
+    "message": "Installation settings are unavailable while this instance is locked."
+  },
   "instance.settings.tabs.java": {
     "message": "Java and memory"
   },
@@ -1049,6 +1331,9 @@
   "instance.settings.tabs.java.java-path-placeholder": {
     "message": "/path/to/java"
   },
+  "instance.settings.tabs.sharing": {
+    "message": "Sharing"
+  },
   "instance.settings.tabs.window": {
     "message": "Window"
   },
@@ -1079,6 +1364,57 @@
   "instance.settings.tabs.window.width.enter": {
     "message": "Enter width..."
   },
+  "instance.shared-instance.error.title": {
+    "message": "Something has gone wrong"
+  },
+  "instance.shared-instance.owner-tooltip": {
+    "message": "This instance's content is being shared to other users."
+  },
+  "instance.shared-instance.publish-review.added-label": {
+    "message": "Added"
+  },
+  "instance.shared-instance.publish-review.admonition-header": {
+    "message": "Push update to players"
+  },
+  "instance.shared-instance.publish-review.config-title-v2": {
+    "message": "Select config files"
+  },
+  "instance.shared-instance.publish-review.description": {
+    "message": "Review the content changes and choose any config files to include in this update."
+  },
+  "instance.shared-instance.publish-review.header": {
+    "message": "Review changes"
+  },
+  "instance.shared-instance.publish-review.publish-button": {
+    "message": "Push update"
+  },
+  "instance.shared-instance.publish-review.removed-label": {
+    "message": "Removed"
+  },
+  "instance.shared-instance.tooltip": {
+    "message": "This instance's content is being managed by someone else."
+  },
+  "instance.shared-instance.unavailable.access-revoked-text": {
+    "message": "Your access to the shared instance was revoked. This instance is still available, but it is no longer linked and will no longer receive updates."
+  },
+  "instance.shared-instance.unavailable.deleted-text": {
+    "message": "The primary instance was deleted. This instance is still available, but it is no longer linked and will no longer receive updates."
+  },
+  "instance.shared-instance.unavailable.locked-text": {
+    "message": "This shared instance was locked by the Content Moderation team. It will no longer receive updates from the primary instance and cannot be played."
+  },
+  "instance.shared-instance.unavailable.locked-title": {
+    "message": "Instance locked"
+  },
+  "instance.shared-instance.unavailable.manager-fallback": {
+    "message": "the instance manager"
+  },
+  "instance.shared-instance.unavailable.text": {
+    "message": "Your local instance is still available, but it is no longer linked and won't receive updates."
+  },
+  "instance.shared-instance.unavailable.title": {
+    "message": "Shared instance no longer available"
+  },
   "instance.worlds.a_minecraft_server": {
     "message": "A Minecraft Server"
   },
@@ -1163,6 +1499,42 @@
   "minecraft-required.sign-in": {
     "message": "Sign in to Microsoft"
   },
+  "modal.modrinth-account-required.browser-description": {
+    "message": "A new tab opened to sign in. Complete the sign in there, then return to the app."
+  },
+  "modal.modrinth-account-required.cancel-button": {
+    "message": "Cancel"
+  },
+  "modal.modrinth-account-required.continue-in-browser-heading": {
+    "message": "Continue in your browser"
+  },
+  "modal.modrinth-account-required.create-account-button": {
+    "message": "Create an account"
+  },
+  "modal.modrinth-account-required.description": {
+    "message": "You'll need to sign into your Modrinth account before you can use this feature."
+  },
+  "modal.modrinth-account-required.header": {
+    "message": "Account required"
+  },
+  "modal.modrinth-account-required.open-browser-again-button": {
+    "message": "Open browser again"
+  },
+  "modal.modrinth-account-required.sign-in-button": {
+    "message": "Sign in to Modrinth"
+  },
+  "modal.modrinth-account-required.sign-in-heading": {
+    "message": "Sign in to a Modrinth account"
+  },
+  "modal.modrinth-account-required.signing-in-header": {
+    "message": "Signing in"
+  },
+  "modal.modrinth-account-required.support-prompt": {
+    "message": "Having trouble signing in? <support>Get support</support>"
+  },
+  "modal.modrinth-account-required.waiting-for-browser": {
+    "message": "Waiting for browser confirmation..."
+  },
   "search.filter.locked.instance": {
     "message": "Provided by the instance"
   },
diff --git a/apps/app-frontend/src/locales/es-419/index.json b/apps/app-frontend/src/locales/es-419/index.json
index a4a1fc907..cef2a9302 100644
--- a/apps/app-frontend/src/locales/es-419/index.json
+++ b/apps/app-frontend/src/locales/es-419/index.json
@@ -425,9 +425,6 @@
   "app.instance.worlds.search-worlds-placeholder": {
     "message": "Buscar en {count} mundos..."
   },
-  "app.modal.install-to-play.dont-install": {
-    "message": "No instalar"
-  },
   "app.modal.install-to-play.header": {
     "message": "Instalar para jugar"
   },
diff --git a/apps/app-frontend/src/locales/fr-FR/index.json b/apps/app-frontend/src/locales/fr-FR/index.json
index 1bc672f8e..4f1034090 100644
--- a/apps/app-frontend/src/locales/fr-FR/index.json
+++ b/apps/app-frontend/src/locales/fr-FR/index.json
@@ -425,9 +425,6 @@
   "app.instance.worlds.search-worlds-placeholder": {
     "message": "Rechercher {count} mondes..."
   },
-  "app.modal.install-to-play.dont-install": {
-    "message": "Ne pas installer"
-  },
   "app.modal.install-to-play.header": {
     "message": "Installer pour jouer"
   },
diff --git a/apps/app-frontend/src/locales/hu-HU/index.json b/apps/app-frontend/src/locales/hu-HU/index.json
index 66e37fb6c..f615b6329 100644
--- a/apps/app-frontend/src/locales/hu-HU/index.json
+++ b/apps/app-frontend/src/locales/hu-HU/index.json
@@ -425,9 +425,6 @@
   "app.instance.worlds.search-worlds-placeholder": {
     "message": "Keresés {count} világ között..."
   },
-  "app.modal.install-to-play.dont-install": {
-    "message": "Ne töltse le"
-  },
   "app.modal.install-to-play.header": {
     "message": "Telepítés a játékhoz"
   },
diff --git a/apps/app-frontend/src/locales/it-IT/index.json b/apps/app-frontend/src/locales/it-IT/index.json
index 559705227..5bb4db667 100644
--- a/apps/app-frontend/src/locales/it-IT/index.json
+++ b/apps/app-frontend/src/locales/it-IT/index.json
@@ -422,9 +422,6 @@
   "app.instance.worlds.search-worlds-placeholder": {
     "message": "Cerca tra {count} mondi..."
   },
-  "app.modal.install-to-play.dont-install": {
-    "message": "Non installare"
-  },
   "app.modal.install-to-play.header": {
     "message": "Installa per continuare"
   },
diff --git a/apps/app-frontend/src/locales/ko-KR/index.json b/apps/app-frontend/src/locales/ko-KR/index.json
index bb4792324..8de9bbb32 100644
--- a/apps/app-frontend/src/locales/ko-KR/index.json
+++ b/apps/app-frontend/src/locales/ko-KR/index.json
@@ -425,9 +425,6 @@
   "app.instance.worlds.search-worlds-placeholder": {
     "message": "{count}개의 세계 검색..."
   },
-  "app.modal.install-to-play.dont-install": {
-    "message": "설치하지 않음"
-  },
   "app.modal.install-to-play.header": {
     "message": "설치하고 플레이"
   },
diff --git a/apps/app-frontend/src/locales/nl-NL/index.json b/apps/app-frontend/src/locales/nl-NL/index.json
index 45f3f430c..712224a26 100644
--- a/apps/app-frontend/src/locales/nl-NL/index.json
+++ b/apps/app-frontend/src/locales/nl-NL/index.json
@@ -425,9 +425,6 @@
   "app.instance.worlds.search-worlds-placeholder": {
     "message": "Zoek werelden"
   },
-  "app.modal.install-to-play.dont-install": {
-    "message": "Niet installeren"
-  },
   "app.modal.install-to-play.header": {
     "message": "Installeer om te spelen"
   },
diff --git a/apps/app-frontend/src/locales/pl-PL/index.json b/apps/app-frontend/src/locales/pl-PL/index.json
index e03632775..3e874d0fc 100644
--- a/apps/app-frontend/src/locales/pl-PL/index.json
+++ b/apps/app-frontend/src/locales/pl-PL/index.json
@@ -422,9 +422,6 @@
   "app.instance.worlds.search-worlds-placeholder": {
     "message": "Szukaj wśród {count} światów..."
   },
-  "app.modal.install-to-play.dont-install": {
-    "message": "Nie instaluj"
-  },
   "app.modal.install-to-play.header": {
     "message": "Zainstaluj, aby grać"
   },
diff --git a/apps/app-frontend/src/locales/pt-BR/index.json b/apps/app-frontend/src/locales/pt-BR/index.json
index a2bdc4ec6..fd4af73c1 100644
--- a/apps/app-frontend/src/locales/pt-BR/index.json
+++ b/apps/app-frontend/src/locales/pt-BR/index.json
@@ -425,9 +425,6 @@
   "app.instance.worlds.search-worlds-placeholder": {
     "message": "Buscar {count} mundos..."
   },
-  "app.modal.install-to-play.dont-install": {
-    "message": "Não instalar"
-  },
   "app.modal.install-to-play.header": {
     "message": "Instale para jogar"
   },
diff --git a/apps/app-frontend/src/locales/ru-RU/index.json b/apps/app-frontend/src/locales/ru-RU/index.json
index 4a17acce4..302f207cd 100644
--- a/apps/app-frontend/src/locales/ru-RU/index.json
+++ b/apps/app-frontend/src/locales/ru-RU/index.json
@@ -419,9 +419,6 @@
   "app.instance.worlds.remove-server-modal.warning-header": {
     "message": "Удаление {name}"
   },
-  "app.modal.install-to-play.dont-install": {
-    "message": "Не устанавливать"
-  },
   "app.modal.install-to-play.header": {
     "message": "Установка перед запуском"
   },
diff --git a/apps/app-frontend/src/locales/sr-CS/index.json b/apps/app-frontend/src/locales/sr-CS/index.json
index e1a64dd53..d538fe6f6 100644
--- a/apps/app-frontend/src/locales/sr-CS/index.json
+++ b/apps/app-frontend/src/locales/sr-CS/index.json
@@ -425,9 +425,6 @@
   "app.instance.worlds.search-worlds-placeholder": {
     "message": "Pretraži {count} svetova..."
   },
-  "app.modal.install-to-play.dont-install": {
-    "message": "Ne instaliraj"
-  },
   "app.modal.install-to-play.header": {
     "message": "Instaliraj da bi igrao"
   },
diff --git a/apps/app-frontend/src/locales/sv-SE/index.json b/apps/app-frontend/src/locales/sv-SE/index.json
index e3509b450..089d3ed3f 100644
--- a/apps/app-frontend/src/locales/sv-SE/index.json
+++ b/apps/app-frontend/src/locales/sv-SE/index.json
@@ -407,9 +407,6 @@
   "app.instance.worlds.search-worlds-placeholder": {
     "message": "Sök {count} världar..."
   },
-  "app.modal.install-to-play.dont-install": {
-    "message": "Installera inte"
-  },
   "app.modal.install-to-play.header": {
     "message": "Installera för att spela"
   },
diff --git a/apps/app-frontend/src/locales/tr-TR/index.json b/apps/app-frontend/src/locales/tr-TR/index.json
index 738bf7b81..d0f68be27 100644
--- a/apps/app-frontend/src/locales/tr-TR/index.json
+++ b/apps/app-frontend/src/locales/tr-TR/index.json
@@ -425,9 +425,6 @@
   "app.instance.worlds.search-worlds-placeholder": {
     "message": "{count} dünya ara..."
   },
-  "app.modal.install-to-play.dont-install": {
-    "message": "İndirme"
-  },
   "app.modal.install-to-play.header": {
     "message": "Oynamak için yükleyin"
   },
diff --git a/apps/app-frontend/src/locales/uk-UA/index.json b/apps/app-frontend/src/locales/uk-UA/index.json
index 57c816f63..bb8de177d 100644
--- a/apps/app-frontend/src/locales/uk-UA/index.json
+++ b/apps/app-frontend/src/locales/uk-UA/index.json
@@ -425,9 +425,6 @@
   "app.instance.worlds.search-worlds-placeholder": {
     "message": "Пошук {count} світів…"
   },
-  "app.modal.install-to-play.dont-install": {
-    "message": "Не встановлювати"
-  },
   "app.modal.install-to-play.header": {
     "message": "Установлення для гри"
   },
diff --git a/apps/app-frontend/src/locales/vi-VN/index.json b/apps/app-frontend/src/locales/vi-VN/index.json
index faac41b71..e0e2384ae 100644
--- a/apps/app-frontend/src/locales/vi-VN/index.json
+++ b/apps/app-frontend/src/locales/vi-VN/index.json
@@ -290,9 +290,6 @@
   "app.instance.worlds.search-worlds-placeholder": {
     "message": "Tìm kiếm {count} world..."
   },
-  "app.modal.install-to-play.dont-install": {
-    "message": "Ngừng tải"
-  },
   "app.modal.install-to-play.header": {
     "message": "Tải xuống để chơi"
   },
diff --git a/apps/app-frontend/src/locales/zh-CN/index.json b/apps/app-frontend/src/locales/zh-CN/index.json
index c4e139490..7972df279 100644
--- a/apps/app-frontend/src/locales/zh-CN/index.json
+++ b/apps/app-frontend/src/locales/zh-CN/index.json
@@ -425,9 +425,6 @@
   "app.instance.worlds.search-worlds-placeholder": {
     "message": "搜索 {count} 个世界……"
   },
-  "app.modal.install-to-play.dont-install": {
-    "message": "不要安装"
-  },
   "app.modal.install-to-play.header": {
     "message": "安装以游玩"
   },
diff --git a/apps/app-frontend/src/locales/zh-TW/index.json b/apps/app-frontend/src/locales/zh-TW/index.json
index b1ddd085e..0f1d34e8e 100644
--- a/apps/app-frontend/src/locales/zh-TW/index.json
+++ b/apps/app-frontend/src/locales/zh-TW/index.json
@@ -425,9 +425,6 @@
   "app.instance.worlds.search-worlds-placeholder": {
     "message": "搜尋 {count} 個世界..."
   },
-  "app.modal.install-to-play.dont-install": {
-    "message": "不要安裝"
-  },
   "app.modal.install-to-play.header": {
     "message": "安裝以遊玩"
   },
diff --git a/apps/app-frontend/src/pages/instance/Index.vue b/apps/app-frontend/src/pages/instance/Index.vue
index 8d7711f15..8d937f2f9 100644
--- a/apps/app-frontend/src/pages/instance/Index.vue
+++ b/apps/app-frontend/src/pages/instance/Index.vue
@@ -4,7 +4,8 @@
 			:class="['p-6 pr-2 pb-4', { 'shrink-0': isFixedRender }]"
 			@contextmenu.prevent.stop="(event) => handleRightClick(event)"
 		>
-			<ExportModal ref="exportModal" :instance="instance" />
+			<ExportModal v-if="!instance.quarantined" ref="exportModal" :instance="instance" />
+			<ConfirmDeleteInstanceModal ref="deleteConfirmModal" @delete="deleteSelectedInstance" />
 			<InstanceSettingsModal
 				:key="instance.id"
 				ref="settingsModal"
@@ -13,6 +14,15 @@
 				@unlinked="fetchInstance"
 			/>
 			<UpdateToPlayModal ref="updateToPlayModal" :instance="instance" />
+			<SharedInstanceUpdateModal
+				ref="sharedInstanceUpdateModal"
+				@shared-instance-unavailable="handleSharedInstanceUnavailable"
+				@report="(event) => reportSharedInstance(event, true)"
+			/>
+			<SharedInstanceInstallModal
+				ref="sharedInstanceReportModal"
+				@reported="handleSharedInstanceReported"
+			/>
 			<InstancePageHeader
 				:instance="instance"
 				:icon-src="icon"
@@ -29,18 +39,32 @@
 				:ping="ping"
 				:minecraft-server="minecraftServer"
 				:linked-project-v3="linkedProjectV3"
+				:shared-instance-manager="sharedInstanceManager"
 				@repair="() => repairInstance()"
 				@stop="() => stopInstance('InstancePage')"
 				@play="() => startInstance('InstancePage')"
 				@play-server="() => handlePlayServer()"
 				@settings="() => settingsModal?.show()"
 				@open-folder="() => instance && showInstanceInFolder(instance.id)"
-				@export="() => exportModal?.show()"
+				@export="() => !instance.quarantined && exportModal?.show()"
 				@create-shortcut="() => createShortcut()"
+				@report="reportSharedInstance"
 			/>
 		</div>
 		<div :class="['px-6', { 'shrink-0': isFixedRender }]">
 			<NavTabs :links="tabs" />
+			<InstanceAdmonitions
+				class="mt-4"
+				:instance="instance"
+				:shared-instance-unavailable-reason="sharedInstanceUnavailableReason"
+				:shared-instance-unavailable-manager="sharedInstanceUnavailableManager"
+				:shared-instance-wrong-account="sharedInstanceWrongAccount"
+				:shared-instance-expected-user-id="sharedInstanceExpectedUserId"
+				:shared-instance-role="instance.shared_instance?.role"
+				:shared-instance-signed-out="sharedInstanceSignedOut"
+				@published="fetchInstance"
+				@delete="requestInstanceDeletion"
+			/>
 		</div>
 		<div :class="['p-6 pt-4', { 'min-h-0 flex-1 overflow-y-auto': isFixedRender }]">
 			<RouterView v-slot="{ Component }" :key="instance.id" :route="displayedInstanceRoute">
@@ -107,10 +131,11 @@ import {
 	StopCircleIcon,
 	TerminalSquareIcon,
 	UpdatedIcon,
+	UserPlusIcon,
 	XIcon,
 } from '@modrinth/assets'
-import { injectNotificationManager, NavTabs, useLoadingBarToken } from '@modrinth/ui'
-import { useQueryClient } from '@tanstack/vue-query'
+import { injectAuth, injectNotificationManager, NavTabs, useLoadingBarToken } from '@modrinth/ui'
+import { useQuery, useQueryClient } from '@tanstack/vue-query'
 import { convertFileSrc } from '@tauri-apps/api/core'
 import dayjs from 'dayjs'
 import relativeTime from 'dayjs/plugin/relativeTime'
@@ -119,9 +144,13 @@ import { useRoute, useRouter } from 'vue-router'
 
 import ContextMenu from '@/components/ui/ContextMenu.vue'
 import ExportModal from '@/components/ui/ExportModal.vue'
+import InstanceAdmonitions from '@/components/ui/instance/instance-admonitions/index.vue'
 import InstancePageHeader from '@/components/ui/instance-page-header/index.vue'
+import ConfirmDeleteInstanceModal from '@/components/ui/modal/ConfirmDeleteInstanceModal.vue'
 import InstanceSettingsModal from '@/components/ui/modal/InstanceSettingsModal.vue'
 import UpdateToPlayModal from '@/components/ui/modal/UpdateToPlayModal.vue'
+import SharedInstanceInstallModal from '@/components/ui/shared-instances/shared-instance-install-modal/index.vue'
+import SharedInstanceUpdateModal from '@/components/ui/shared-instances/SharedInstanceUpdateModal.vue'
 import {
 	fetchCachedServerStatus,
 	getFreshCachedServerStatus,
@@ -130,10 +159,25 @@ import { useInstanceConsole } from '@/composables/useInstanceConsole'
 import { trackEvent } from '@/helpers/analytics'
 import { get_project_v3 } from '@/helpers/cache.js'
 import { instance_listener, process_listener } from '@/helpers/events'
-import { install_existing_instance, install_pack_to_existing_instance } from '@/helpers/install'
-import { get, get_full_path, kill, run } from '@/helpers/instance'
+import {
+	getSharedInstanceUnavailableReason,
+	install_existing_instance,
+	install_get_shared_instance_preview,
+	install_pack_to_existing_instance,
+	isSharedInstanceUnavailableError,
+	type SharedInstanceUnavailableReason,
+} from '@/helpers/install'
+import {
+	can_current_user_use_shared_instances,
+	get,
+	get_full_path,
+	kill,
+	remove,
+	run,
+} from '@/helpers/instance'
 import { type InstanceContentData, loadInstanceContentData } from '@/helpers/instance-content'
 import { get_by_instance_id } from '@/helpers/process'
+import { useSharedInstanceErrors } from '@/helpers/shared-instance-errors'
 import type { GameInstance } from '@/helpers/types'
 import { createInstanceShortcut, showInstanceInFolder } from '@/helpers/utils.js'
 import { refreshWorlds, type ServerStatus } from '@/helpers/worlds'
@@ -141,10 +185,13 @@ import { injectServerInstall } from '@/providers/server-install'
 import { handleSevereError } from '@/store/error.js'
 import { useBreadcrumbs, useTheming } from '@/store/state'
 
+import { provideSharedInstanceState, useSharedInstanceState } from './use-shared-instance-state'
+
 dayjs.extend(relativeTime)
 
 const { addNotification, handleError } = injectNotificationManager()
 const { playServerProject } = injectServerInstall()
+const auth = injectAuth()
 const queryClient = useQueryClient()
 const route = useRoute()
 
@@ -167,17 +214,23 @@ const instance = ref<GameInstance>()
 const preloadedContent = ref<InstanceContentData | null>(null)
 const playing = ref(false)
 const loading = ref(false)
+const checkingSharedInstanceLaunch = ref(false)
 const subpagePending = ref(false)
 const stopping = ref(false)
 const exportModal = ref<InstanceType<typeof ExportModal>>()
 const updateToPlayModal = ref<InstanceType<typeof UpdateToPlayModal>>()
+const sharedInstanceUpdateModal = ref<InstanceType<typeof SharedInstanceUpdateModal>>()
+const sharedInstanceReportModal = ref<InstanceType<typeof SharedInstanceInstallModal>>()
+const deleteConfirmModal = ref<InstanceType<typeof ConfirmDeleteInstanceModal>>()
+const selectedInstanceToDelete = ref<GameInstance | null>(null)
+
+const { notifySharedInstanceError, notifySharedInstanceUnavailable } = useSharedInstanceErrors()
 
 useLoadingBarToken(subpagePending)
 
 const isServerInstance = ref(false)
 const linkedProjectV3 = ref<Labrinth.Projects.v3.Project>()
 const selected = ref<unknown[]>([])
-
 const minecraftServer = computed(() => linkedProjectV3.value?.minecraft_server)
 const javaServerPingData = computed(() => linkedProjectV3.value?.minecraft_java_server?.ping?.data)
 const liveServerStatusOnline = ref(false)
@@ -189,11 +242,27 @@ const playersOnline = ref<number | undefined>(undefined)
 const ping = ref<number | undefined>(undefined)
 const loadingServerPing = ref(false)
 const activeInstanceId = ref<string>()
+const sharedInstanceState = useSharedInstanceState(instance, offline, notifySharedInstanceError)
+provideSharedInstanceState(sharedInstanceState)
+const {
+	actionsLocked: sharedInstanceActionsLocked,
+	expectedUserId: sharedInstanceExpectedUserId,
+	manager: sharedInstanceManager,
+	refreshUpdatePreview: refreshSharedInstanceUpdatePreview,
+	setUnavailable: setSharedInstanceUnavailable,
+	signedOut: sharedInstanceSignedOut,
+	unavailableManager: sharedInstanceUnavailableManager,
+	unavailableReason: sharedInstanceUnavailableReason,
+	wrongAccount: sharedInstanceWrongAccount,
+} = sharedInstanceState
 
 watch(
 	() => router.currentRoute.value,
 	(nextRoute) => {
-		if (nextRoute.path.startsWith('/instance')) {
+		if (
+			nextRoute.path.startsWith('/instance') &&
+			(!instance.value || nextRoute.params.id === instance.value.id)
+		) {
 			displayedInstanceRoute.value = nextRoute
 		}
 	},
@@ -219,17 +288,15 @@ function isContentSubpageRoute(routeName = displayedInstanceRoute.value.name) {
 }
 
 async function fetchInstance() {
-	isServerInstance.value = false
-	linkedProjectV3.value = undefined
-	preloadedContent.value = null
-	resetServerStatus()
+	const requestedInstanceId = route.params.id as string
+	const requestedRouteName = route.name
 
-	const nextInstance = await get(route.params.id as string).catch(handleError)
+	const nextInstance = await get(requestedInstanceId).catch(handleError)
 	let nextLinkedProjectV3: Labrinth.Projects.v3.Project | undefined
 	let nextIsServerInstance = false
 
 	const contentPreloadPromise =
-		nextInstance && isContentSubpageRoute()
+		nextInstance && isContentSubpageRoute(requestedRouteName)
 			? loadInstanceContentData(nextInstance.id, undefined, handleError)
 			: Promise.resolve(null)
 
@@ -245,13 +312,25 @@ async function fetchInstance() {
 		}
 	}
 
-	const nextPreloadedContent = await contentPreloadPromise
+	let nextPreloadedContent = await contentPreloadPromise
+	let nextRoute = router.currentRoute.value
+	if (nextRoute.params.id !== requestedInstanceId) return
+
+	if (nextInstance && isContentSubpageRoute(nextRoute.name) && !nextPreloadedContent) {
+		nextPreloadedContent = await loadInstanceContentData(nextInstance.id, undefined, handleError)
+		nextRoute = router.currentRoute.value
+		if (nextRoute.params.id !== requestedInstanceId) return
+	}
 
 	instance.value = nextInstance ?? undefined
+	displayedInstanceRoute.value = nextRoute
+	sharedInstanceState.reset()
+	sharedInstanceState.refreshAvailability()
 	linkedProjectV3.value = nextLinkedProjectV3
 	isServerInstance.value = nextIsServerInstance
 	preloadedContent.value = nextPreloadedContent
 	activeInstanceId.value = nextInstance?.id
+	resetServerStatus()
 
 	fetchDeferredData(nextInstance?.id)
 
@@ -335,29 +414,78 @@ const isFixedRender = computed(() => renderMode.value === 'fixed')
 const contentSubpageProps = computed(() =>
 	isContentSubpageRoute() ? { preloadedContent: preloadedContent.value } : {},
 )
+const { data: canCurrentUserUseSharedInstances } = useQuery({
+	queryKey: computed(() => ['shared-instance-eligibility', auth.user.value?.id]),
+	queryFn: can_current_user_use_shared_instances,
+	enabled: () => !!auth.session_token.value && !!auth.user.value?.id,
+	retry: false,
+	staleTime: Infinity,
+	refetchOnMount: 'always',
+	refetchOnWindowFocus: false,
+	refetchOnReconnect: false,
+})
+const currentUserCanUseSharedInstances = computed(
+	() => !auth.session_token.value || canCurrentUserUseSharedInstances.value !== false,
+)
+const showShareTab = computed(() => {
+	const linkType = instance.value?.link?.type
 
-const tabs = computed(() => [
-	{
-		label: 'Content',
-		href: `${basePath.value}`,
-		icon: BoxesIcon,
+	return (
+		currentUserCanUseSharedInstances.value &&
+		!instance.value?.quarantined &&
+		instance.value?.shared_instance?.role !== 'member' &&
+		linkType !== 'server_project' &&
+		linkType !== 'server_project_modpack'
+	)
+})
+
+const tabs = computed(() => {
+	const instanceTabs = [
+		{
+			label: 'Content',
+			href: `${basePath.value}`,
+			icon: BoxesIcon,
+		},
+		{
+			label: 'Files',
+			href: `${basePath.value}/files`,
+			icon: FolderOpenIcon,
+		},
+		{
+			label: 'Worlds',
+			href: `${basePath.value}/worlds`,
+			icon: GlobeIcon,
+		},
+		{
+			label: 'Logs',
+			href: `${basePath.value}/logs`,
+			icon: TerminalSquareIcon,
+		},
+	]
+
+	if (showShareTab.value) {
+		instanceTabs.push({
+			label: 'Share',
+			href: `${basePath.value}/share`,
+			icon: UserPlusIcon,
+		})
+	}
+
+	return instanceTabs
+})
+
+watch(
+	() => ({
+		quarantined: instance.value?.quarantined ?? false,
+		routeName: router.currentRoute.value.name,
+	}),
+	({ quarantined, routeName }) => {
+		if (quarantined && routeName === 'InstanceShare') {
+			void router.replace(basePath.value)
+		}
 	},
-	{
-		label: 'Files',
-		href: `${basePath.value}/files`,
-		icon: FolderOpenIcon,
-	},
-	{
-		label: 'Worlds',
-		href: `${basePath.value}/worlds`,
-		icon: GlobeIcon,
-	},
-	{
-		label: 'Logs',
-		href: `${basePath.value}/logs`,
-		icon: TerminalSquareIcon,
-	},
-])
+	{ immediate: true },
+)
 
 if (instance.value) {
 	breadcrumbs.setName(
@@ -375,13 +503,8 @@ if (instance.value) {
 
 const options = ref<InstanceType<typeof ContextMenu> | null>(null)
 
-const startInstance = async (context: string) => {
-	if (!instance.value) return
-	if (updateToPlayModal.value?.hasUpdate) {
-		updateToPlayModal.value.show(instance.value)
-		return
-	}
-
+const launchInstance = async (context: string) => {
+	if (!instance.value || instance.value.quarantined) return
 	loading.value = true
 	try {
 		await run(route.params.id as string)
@@ -391,6 +514,7 @@ const startInstance = async (context: string) => {
 	}
 	loading.value = false
 
+	if (!instance.value) return
 	trackEvent('InstanceStart', {
 		loader: instance.value.loader,
 		game_version: instance.value.game_version,
@@ -398,6 +522,65 @@ const startInstance = async (context: string) => {
 	})
 }
 
+async function handleSharedInstanceUnavailable(
+	reason: SharedInstanceUnavailableReason | null = null,
+) {
+	notifySharedInstanceUnavailable(reason, sharedInstanceUnavailableManager.value)
+	await fetchInstance()
+	setSharedInstanceUnavailable(reason)
+}
+
+const startInstance = async (context: string) => {
+	if (!instance.value || instance.value.quarantined) return
+	if (checkingSharedInstanceLaunch.value || loading.value || playing.value) return
+
+	const instanceId = instance.value.id
+	const isSharedInstanceMember = instance.value.shared_instance?.role === 'member'
+	const canCheckSharedInstanceUpdate =
+		!!instance.value.shared_instance && !sharedInstanceActionsLocked.value && !offline.value
+
+	if (canCheckSharedInstanceUpdate) {
+		let preview: Awaited<ReturnType<typeof refreshSharedInstanceUpdatePreview>>
+		checkingSharedInstanceLaunch.value = true
+		try {
+			preview = await refreshSharedInstanceUpdatePreview()
+		} catch (error) {
+			if (isSharedInstanceUnavailableError(error)) {
+				await handleSharedInstanceUnavailable(getSharedInstanceUnavailableReason(error))
+			} else {
+				notifySharedInstanceError(error)
+			}
+			return
+		} finally {
+			checkingSharedInstanceLaunch.value = false
+		}
+
+		if (instance.value?.id !== instanceId) return
+
+		if (preview?.updateAvailable && sharedInstanceUpdateModal.value) {
+			sharedInstanceUpdateModal.value.show(instance.value, preview, async () => {
+				await fetchInstance()
+				await launchInstance(context)
+			})
+			return
+		}
+	}
+
+	if (updateToPlayModal.value?.hasUpdate) {
+		if (isSharedInstanceMember) {
+			updateToPlayModal.value.show(instance.value, null, async () => {
+				await fetchInstance()
+				await launchInstance(context)
+			})
+		} else {
+			updateToPlayModal.value.show(instance.value)
+		}
+		return
+	}
+
+	await launchInstance(context)
+}
+
 const stopInstance = async (context: string) => {
 	stopping.value = true
 	await kill(route.params.id as string).catch(handleError)
@@ -413,7 +596,7 @@ const stopInstance = async (context: string) => {
 }
 
 const handlePlayServer = async () => {
-	if (!instance.value?.link?.project_id) return
+	if (!instance.value?.link?.project_id || instance.value.quarantined) return
 	loading.value = true
 	try {
 		await playServerProject(instance.value.link.project_id)
@@ -424,6 +607,7 @@ const handlePlayServer = async () => {
 }
 
 const repairInstance = async () => {
+	if (instance.value.quarantined) return
 	if (
 		instance.value.install_stage !== 'pack_installed' &&
 		(instance.value.link?.type === 'modrinth_modpack' ||
@@ -441,7 +625,7 @@ const repairInstance = async () => {
 }
 
 const createShortcut = async () => {
-	if (!instance.value) return
+	if (!instance.value || instance.value.quarantined) return
 	try {
 		const shortcutPath = await createInstanceShortcut(instance.value.name, instance.value.id)
 		if (!shortcutPath) return
@@ -459,10 +643,51 @@ const createShortcut = async () => {
 	}
 }
 
+async function reportSharedInstance(event?: MouseEvent, closeUpdateModal = false) {
+	const reportInstance = instance.value
+	const sharedInstance = reportInstance?.shared_instance
+	if (!reportInstance || sharedInstance?.role !== 'member') return
+
+	try {
+		const preview = await install_get_shared_instance_preview(
+			sharedInstance.id,
+			reportInstance.name,
+		)
+		if (instance.value?.id !== reportInstance.id) return
+		if (closeUpdateModal) sharedInstanceUpdateModal.value?.hide()
+		sharedInstanceReportModal.value?.showReport(preview, event)
+	} catch (error) {
+		handleError(error as Error)
+	}
+}
+
+function handleSharedInstanceReported(deleteInstance: boolean) {
+	if (!deleteInstance || !instance.value) return
+	requestInstanceDeletion()
+}
+
+function requestInstanceDeletion() {
+	if (!instance.value) return
+	selectedInstanceToDelete.value = instance.value
+	deleteConfirmModal.value?.show()
+}
+
+async function deleteSelectedInstance() {
+	const selectedInstance = selectedInstanceToDelete.value
+	selectedInstanceToDelete.value = null
+	if (!selectedInstance) return
+
+	trackEvent('InstanceRemove', {
+		loader: selectedInstance.loader,
+		game_version: selectedInstance.game_version,
+	})
+	await router.push({ path: '/' })
+	await remove(selectedInstance.id).catch(handleError)
+}
+
 const handleRightClick = (event: MouseEvent) => {
 	const baseOptions = [
-		{ name: 'add_content' },
-		{ type: 'divider' },
+		...(instance.value?.quarantined ? [] : [{ name: 'add_content' }, { type: 'divider' }]),
 		{ name: 'edit' },
 		{ name: 'open_folder' },
 		{ name: 'copy_path' },
@@ -480,10 +705,14 @@ const handleRightClick = (event: MouseEvent) => {
 					...baseOptions,
 				]
 			: [
-					{
-						name: 'play',
-						color: 'primary',
-					},
+					...(instance.value?.quarantined
+						? []
+						: [
+								{
+									name: 'play',
+									color: 'primary',
+								},
+							]),
 					...baseOptions,
 				],
 	)
diff --git a/apps/app-frontend/src/pages/instance/Mods.vue b/apps/app-frontend/src/pages/instance/Mods.vue
index 93db7a5ee..1da28f349 100644
--- a/apps/app-frontend/src/pages/instance/Mods.vue
+++ b/apps/app-frontend/src/pages/instance/Mods.vue
@@ -19,14 +19,26 @@
 					ref="modpackContentModal"
 					:modpack-name="displayedModpackProject?.title"
 					:modpack-icon-url="displayedModpackProject?.icon_url ?? undefined"
-					:enable-toggle="!props.isServerInstance"
+					:enable-toggle="!props.isServerInstance && !isSharedMember && !isQuarantined"
 					:busy="isBulkOperating"
 					:get-overflow-options="getOverflowOptions"
-					:switch-version="handleSwitchVersion"
+					:switch-version="
+						props.isServerInstance || isSharedMember || isQuarantined
+							? undefined
+							: handleSwitchVersion
+					"
 					@update:enabled="handleModpackContentToggle"
 					@bulk:enable="(items) => handleModpackContentBulkToggle(items, true)"
 					@bulk:disable="(items) => handleModpackContentBulkToggle(items, false)"
 				/>
+				<ConfirmDisableModal
+					ref="sharedDisableConfirmModal"
+					:count="pendingModpackDisableItems.length"
+					:item-type="formatMessage(messages.contentTypeProject)"
+					:warning="managedContentPolicy.disableWarning(pendingModpackDisableItems)"
+					:action-disabled="isInstanceBusy"
+					@disable="confirmPendingModpackContentDisable"
+				/>
 				<ConfirmModpackUpdateModal
 					ref="modpackUpdateConfirmModal"
 					:downgrade="isModpackUpdateDowngrade"
@@ -38,7 +50,11 @@
 					@confirm="handleModpackUpdateConfirm"
 					@cancel="handleModpackUpdateCancel"
 				/>
-				<ExportModal v-if="projects.length > 0" ref="exportModal" :instance="instance" />
+				<ExportModal
+					v-if="projects.length > 0 && !instance.quarantined"
+					ref="exportModal"
+					:instance="instance"
+				/>
 				<ContentUpdaterModal
 					v-if="updatingProject || updatingModpack"
 					ref="contentUpdaterModal"
@@ -78,6 +94,7 @@ import { ClipboardCopyIcon, FolderOpenIcon } from '@modrinth/assets'
 import {
 	type BulkOperationStatus,
 	commonMessages,
+	ConfirmDisableModal,
 	ConfirmModpackUpdateModal,
 	ContentCardLayout as ContentPageLayout,
 	type ContentItem,
@@ -91,7 +108,6 @@ import {
 	ModpackContentModal,
 	type ModpackContentModalState,
 	type OverflowMenuOption,
-	provideAppBackup,
 	provideContentManager,
 	ReadyTransition,
 	UnknownFileWarningModal,
@@ -109,6 +125,7 @@ import { useRouter } from 'vue-router'
 
 import ExportModal from '@/components/ui/ExportModal.vue'
 import ShareModalWrapper from '@/components/ui/modal/ShareModalWrapper.vue'
+import { useManagedContentPolicy } from '@/composables/instances/use-managed-content-policy'
 import { trackEvent } from '@/helpers/analytics'
 import { get_project_versions, get_version, get_version_many } from '@/helpers/cache.js'
 import {
@@ -116,13 +133,11 @@ import {
 	instance_listener,
 	type InstanceBulkUpdateProgress,
 } from '@/helpers/events.js'
-import { install_duplicate_instance, installJobInstanceId } from '@/helpers/install'
 import {
 	add_project_from_path,
 	edit,
 	get_linked_modpack_content,
 	is_file_on_modrinth,
-	list,
 	remove_project,
 	switch_project_version_with_dependencies,
 	toggle_disable_project,
@@ -134,6 +149,7 @@ import { get as getSettings, set as setSettings } from '@/helpers/settings'
 import type { CacheBehaviour, GameInstance } from '@/helpers/types'
 import { highlightModInInstance } from '@/helpers/utils.js'
 import { injectContentInstall } from '@/providers/content-install'
+import { provideInstanceBackup } from '@/providers/instance-backup'
 import { useTheming } from '@/store/state'
 import type { FeatureFlag } from '@/store/theme'
 
@@ -158,6 +174,10 @@ const messages = defineMessages({
 		id: 'app.instance.mods.projects-were-added',
 		defaultMessage: '{count} projects were added',
 	},
+	lockedContent: {
+		id: 'app.instance.mods.locked-content',
+		defaultMessage: 'Content in locked instances cannot be changed.',
+	},
 	contentTypeProject: {
 		id: 'app.instance.mods.content-type-project',
 		defaultMessage: 'project',
@@ -197,6 +217,13 @@ const props = defineProps<{
 	openSettings?: () => void
 	preloadedContent?: InstanceContentData | null
 }>()
+const managedContentPolicy = useManagedContentPolicy(computed(() => props.instance))
+const {
+	isManagedModpack: isSharedMember,
+	isQuarantined,
+	canMutateContent,
+	canUpdateContent: canUpdateProject,
+} = managedContentPolicy
 
 function hasPreloadedContent(contentData: InstanceContentData | null | undefined) {
 	return contentData?.path === props.instance.id
@@ -287,6 +314,7 @@ const isBulkOperating = ref(false)
 const isInstanceBusy = computed(() => props.instance?.install_stage !== 'installed')
 const isPackLocked = computed(
 	() =>
+		props.instance.quarantined ||
 		props.instance?.link?.type === 'modrinth_modpack' ||
 		props.instance?.link?.type === 'server_project_modpack',
 )
@@ -296,6 +324,8 @@ const exportModal = ref(null)
 const contentUpdaterModal = ref<InstanceType<typeof ContentUpdaterModal> | null>()
 const modpackContentModal = ref<InstanceType<typeof ModpackContentModal> | null>()
 const modpackUpdateConfirmModal = ref<InstanceType<typeof ConfirmModpackUpdateModal> | null>()
+const sharedDisableConfirmModal = ref<InstanceType<typeof ConfirmDisableModal> | null>()
+const pendingModpackDisableItems = ref<ContentItem[]>([])
 const unknownFileWarningModal = ref<InstanceType<typeof UnknownFileWarningModal> | null>()
 const unknownFileName = ref('')
 let resolveUnknownFileConfirmation: ((confirmed: boolean) => void) | null = null
@@ -377,8 +407,8 @@ function hasContentOperation(item: ContentItem) {
 	return keys.some((key) => activeContentOperationKeys.value.has(key))
 }
 
-function canUpdateProject(item: ContentItem) {
-	return !!item.file_path && !!item.has_update && !!item.update_version_id
+function canDeleteContent(item: ContentItem) {
+	return canMutateContent(item)
 }
 
 function setContentItemBusy(item: ContentItem, busy: boolean, originalFileName = item.file_name) {
@@ -486,7 +516,7 @@ async function getUpdaterProjectVersions(projectId: string, pinnedVersionId?: st
 }
 
 async function handleBrowseContent() {
-	if (!props.instance) return
+	if (!props.instance || props.instance.quarantined) return
 	await router.push({
 		path: `/browse/${props.instance.loader === 'vanilla' ? 'resourcepack' : 'mod'}`,
 		query: { i: props.instance.id },
@@ -494,7 +524,7 @@ async function handleBrowseContent() {
 }
 
 async function handleUploadFiles() {
-	if (!props.instance) return
+	if (!props.instance || props.instance.quarantined) return
 	const files = await open({ multiple: true })
 	if (!files) return
 	const selectedFiles: Array<{ path: string; filename: string }> = []
@@ -517,26 +547,37 @@ async function handleUploadFiles() {
 		}),
 	)
 
-	const addedFiles: string[] = []
+	const confirmedFiles: Array<{ path: string; filename: string }> = []
 	for (const [index, { path, filename }] of selectedFiles.entries()) {
 		if (!fileRecognition[index] && !(await confirmUnknownFileInstallation(filename))) {
 			continue
 		}
-		try {
-			await add_project_from_path(props.instance.id, path)
-			addedFiles.push(filename)
-		} catch (e) {
-			handleError(e as Error)
-		}
+		confirmedFiles.push({ path, filename })
 	}
-	await initProjects()
 
-	if (addedFiles.length > 0) {
-		const names = addedFiles.map((f) => {
-			const item = projects.value.find(
-				(p) => p.file_name === f || p.file_name === f.replace('.zip', '.jar'),
-			)
-			return item?.project?.title ?? f
+	const addedFiles = (
+		await Promise.all(
+			confirmedFiles.map(async ({ path, filename }) => {
+				try {
+					const installedPath = await add_project_from_path(props.instance.id, path)
+					return { filename, installedPath }
+				} catch (error) {
+					handleError(error as Error)
+					return null
+				}
+			}),
+		)
+	).filter((result): result is { filename: string; installedPath: string } => result !== null)
+	const uniqueAddedFiles = [
+		...new Map(addedFiles.map((file) => [file.installedPath, file])).values(),
+	]
+
+	await initProjects('must_revalidate')
+
+	if (uniqueAddedFiles.length > 0) {
+		const names = uniqueAddedFiles.map(({ filename, installedPath }) => {
+			const item = projects.value.find((project) => project.file_path === installedPath)
+			return item?.project?.title ?? filename
 		})
 		addNotification({
 			type: 'success',
@@ -784,6 +825,7 @@ async function updateProject(mod: ContentItem) {
 }
 
 async function switchProjectVersion(mod: ContentItem, version: Labrinth.Versions.v2.Version) {
+	if (!canMutateContent(mod)) return
 	if (!mod.file_path) return
 	const operation = beginContentOperation(mod)
 	if (!operation) return
@@ -920,6 +962,7 @@ async function handleUpdate(id: string) {
 }
 
 async function handleSwitchVersion(item: ContentItem) {
+	if (!canMutateContent(item)) return
 	if (!item.project?.id || !item.version?.id) return
 
 	const requestId = beginUpdateRequest()
@@ -947,10 +990,32 @@ async function handleSwitchVersion(item: ContentItem) {
 }
 
 async function handleModpackContentToggle(item: ContentItem, enabled: boolean) {
+	if (!enabled && managedContentPolicy.disableWarning([item])) {
+		pendingModpackDisableItems.value = [item]
+		sharedDisableConfirmModal.value?.show()
+		return
+	}
+
 	await toggleDisableDebounced(item, enabled)
 }
 
 async function handleModpackContentBulkToggle(items: ContentItem[], enabled: boolean) {
+	if (!enabled && managedContentPolicy.disableWarning(items)) {
+		pendingModpackDisableItems.value = items
+		sharedDisableConfirmModal.value?.show()
+		return
+	}
+
+	await setModpackContentEnabled(items, enabled)
+}
+
+async function confirmPendingModpackContentDisable() {
+	const items = [...pendingModpackDisableItems.value]
+	pendingModpackDisableItems.value = []
+	await setModpackContentEnabled(items, false)
+}
+
+async function setModpackContentEnabled(items: ContentItem[], enabled: boolean) {
 	await Promise.all(items.map((item) => toggleDisableMod(item, enabled)))
 }
 
@@ -1300,29 +1365,7 @@ function applyContentData(contentData: InstanceContentData) {
 	return true
 }
 
-provideAppBackup({
-	async createBackup() {
-		const allInstances = await list()
-		const prefix = `${props.instance.name} - Backup #`
-		const existingNums = allInstances
-			.filter((p) => p.name.startsWith(prefix))
-			.map((p) => parseInt(p.name.slice(prefix.length), 10))
-			.filter((n) => !isNaN(n))
-		const nextNum = existingNums.length > 0 ? Math.max(...existingNums) + 1 : 1
-		const job = await install_duplicate_instance(props.instance.id)
-		const newInstanceId = installJobInstanceId(job)
-		if (newInstanceId) {
-			await edit(newInstanceId, { name: `${prefix}${nextNum}` })
-		}
-	},
-})
-
-const CONTENT_HINT_KEY = 'content-tab-modpack-hint-dismissed'
-const showContentHint = ref(localStorage.getItem(CONTENT_HINT_KEY) === null)
-function dismissContentHint() {
-	showContentHint.value = false
-	localStorage.setItem(CONTENT_HINT_KEY, 'true')
-}
+provideInstanceBackup(() => props.instance)
 
 provideContentManager({
 	items: mergedProjects,
@@ -1378,21 +1421,31 @@ provideContentManager({
 	}),
 	isPackLocked,
 	isBusy: isInstanceBusy,
+	disableAddContent: isQuarantined,
+	disableAddContentTooltip: formatMessage(messages.lockedContent),
 	isBulkOperating,
 	skipNonEssentialWarnings,
 	contentTypeLabel: ref(formatMessage(messages.contentTypeProject)),
 	toggleEnabled: toggleDisableDebounced,
 	bulkEnableItems: (items: ContentItem[]) =>
 		Promise.all(
-			items.filter((item) => !item.enabled).map((item) => toggleDisableMod(item, true)),
+			items
+				.filter((item) => canMutateContent(item) && !item.enabled)
+				.map((item) => toggleDisableMod(item, true)),
 		).then(() => {}),
 	bulkDisableItems: (items: ContentItem[]) =>
 		Promise.all(
-			items.filter((item) => item.enabled).map((item) => toggleDisableMod(item, false)),
+			items
+				.filter((item) => canMutateContent(item) && item.enabled)
+				.map((item) => toggleDisableMod(item, false)),
 		).then(() => {}),
 	deleteItem: removeMod,
 	bulkDeleteItems: (items: ContentItem[]) =>
-		Promise.all(items.map((item) => removeMod(item))).then(() => {}),
+		Promise.all(items.filter(canMutateContent).map((item) => removeMod(item))).then(() => {}),
+	canDeleteItem: canDeleteContent,
+	canToggleItem: canMutateContent,
+	getDeleteWarning: managedContentPolicy.deleteWarning,
+	getDisableWarning: managedContentPolicy.disableWarning,
 	getDeleteDependencyWarning,
 	refresh: () => initProjects('must_revalidate'),
 	browse: handleBrowseContent,
@@ -1401,14 +1454,15 @@ provideContentManager({
 	updateItem: handleUpdate,
 	bulkUpdateAll: bulkUpdateAllProjects,
 	bulkUpdateItem: updateProject,
-	updateModpack: props.isServerInstance ? undefined : handleModpackUpdate,
+	updateModpack:
+		props.isServerInstance || isSharedMember.value || isQuarantined.value
+			? undefined
+			: handleModpackUpdate,
 	viewModpackContent: handleModpackContent,
 	unlinkModpack: unpairInstance,
 	openSettings: props.openSettings,
 	switchVersion: handleSwitchVersion,
 	getOverflowOptions,
-	showContentHint,
-	dismissContentHint,
 	shareItems: handleShareItems,
 	getItemId: getContentItemId,
 	mapToTableItem: (item: ContentItem) => ({
@@ -1440,8 +1494,11 @@ provideContentManager({
 					link: () => openUrl(`https://modrinth.com/${item.owner!.type}/${item.owner!.id}`),
 				}
 			: undefined,
-		enabled: item.enabled,
+		enabled: canMutateContent(item) ? item.enabled : undefined,
 		installing: item.installing,
+		hideDelete: !canDeleteContent(item),
+		hideSwitchVersion: !canMutateContent(item),
+		hasUpdate: canUpdateProject(item),
 	}),
 	filterPersistKey: props.instance.id,
 })
diff --git a/apps/app-frontend/src/pages/instance/Worlds.vue b/apps/app-frontend/src/pages/instance/Worlds.vue
index 6d6be96fc..1ddcb5e94 100644
--- a/apps/app-frontend/src/pages/instance/Worlds.vue
+++ b/apps/app-frontend/src/pages/instance/Worlds.vue
@@ -88,6 +88,7 @@
 					:highlighted="highlightedWorld === getWorldIdentifier(world)"
 					:supports-server-quick-play="supportsServerQuickPlay"
 					:supports-world-quick-play="supportsWorldQuickPlay"
+					:quarantined="instance.quarantined"
 					:current-protocol="protocolVersion"
 					:playing-instance="playing"
 					:playing-world="worldsMatch(world, worldPlaying)"
@@ -273,6 +274,7 @@ const instance = computed(() => props.instance)
 const playing = computed(() => props.playing)
 
 function play(world: World) {
+	if (props.instance.quarantined) return
 	emit('play', world)
 }
 
@@ -523,6 +525,7 @@ function handleJoinError(err: Error) {
 }
 
 async function joinWorld(world: World) {
+	if (instance.value.quarantined) return
 	console.log(`Joining world ${getWorldIdentifier(world)}`)
 	startingInstance.value = true
 	worldPlaying.value = world
diff --git a/apps/app-frontend/src/pages/instance/index.js b/apps/app-frontend/src/pages/instance/index.js
index b96705e88..0e6a0e7ec 100644
--- a/apps/app-frontend/src/pages/instance/index.js
+++ b/apps/app-frontend/src/pages/instance/index.js
@@ -3,6 +3,7 @@ import Index from './Index.vue'
 import Logs from './Logs.vue'
 import Mods from './Mods.vue'
 import Overview from './Overview.vue'
+import Share from './share/index.vue'
 import Worlds from './Worlds.vue'
 
-export { Files, Index, Logs, Mods, Overview, Worlds }
+export { Files, Index, Logs, Mods, Overview, Share, Worlds }
diff --git a/apps/app-frontend/src/pages/instance/share/index.vue b/apps/app-frontend/src/pages/instance/share/index.vue
new file mode 100644
index 000000000..2588ba79f
--- /dev/null
+++ b/apps/app-frontend/src/pages/instance/share/index.vue
@@ -0,0 +1,373 @@
+<template>
+	<div v-if="!instance.quarantined" class="flex flex-col gap-4">
+		<ModrinthAccountRequiredModal ref="accountRequiredModal" :request-auth="requestAuth" />
+		<InvitePlayersModal
+			ref="invitePlayersModal"
+			:header="formatMessage(messages.shareModalHeader, { name: instance.name })"
+			:friends="inviteFriends"
+			:search-users="searchInviteUsers"
+			:link="inviteLink.link.value"
+			:link-expires-at="inviteLink.details.value?.expiresAt"
+			:link-max-uses="inviteLink.details.value?.maxUses"
+			:update-invite-link="inviteLink.update"
+			:user-profile-link="userProfileLink"
+			@invite="invitePlayer"
+			@cancel="cancelInvite"
+		/>
+		<ConfirmUnlinkModal
+			ref="unlinkModal"
+			:warning="{
+				header: formatMessage(messages.unlinkForShareHeader),
+				body: formatMessage(messages.unlinkForShareBody),
+			}"
+			:backup-tip="importedModpackBackupTip"
+			@unlink="unlinkImportedModpack"
+		/>
+		<SharedInstanceRemoveMemberModal
+			ref="removeMemberModal"
+			:row="pendingRemovalRow"
+			:member-count="members.rows.value.length"
+			@confirm="removeMember"
+			@clear="pendingRemovalRow = null"
+		/>
+		<SharedInstancePublishModal
+			ref="publishModal"
+			:instance="instance"
+			@state-change="publishState = $event"
+		/>
+
+		<SharedInstanceMembersTable
+			v-if="members.rows.value.length > 0"
+			:rows="members.rows.value"
+			:actions-locked="sharedInstanceActionsLocked"
+			:invite-pending="inviteLink.pending.value"
+			:push-update-disabled="
+				instance.install_stage !== 'installed' || publishState !== 'idle' || !!offline
+			"
+			:push-update-pending="publishState !== 'idle'"
+			@invite="showInvitePlayers"
+			@remove="showRemoveMemberModal"
+			@push-update="reviewUpdate"
+		/>
+
+		<SharedInstanceShareEmptyState
+			v-else-if="sharedInstanceUnavailable"
+			:heading="formatMessage(sharedInstanceErrorMessages.unavailableTitle)"
+			:description="
+				formatSharedInstanceUnavailable(
+					sharedInstanceUnavailableReason,
+					sharedInstanceUnavailableManager,
+				)
+			"
+		/>
+
+		<SharedInstanceShareEmptyState
+			v-else-if="sharedInstanceActionsLocked"
+			:heading="formatMessage(lockedEmptyHeading)"
+		>
+			<template #description>
+				<span class="flex flex-wrap items-center justify-center gap-x-1.5 gap-y-1">
+					<span>{{ formatMessage(messages.lockedEmptyDescriptionPrefix) }}</span>
+					<span
+						v-if="linkedAccount"
+						class="inline-flex max-w-full min-w-0 items-center gap-1.5 align-middle font-semibold text-primary"
+					>
+						<Avatar
+							:src="linkedAccount.avatarUrl"
+							:alt="linkedAccount.username"
+							:tint-by="linkedAccount.tintBy"
+							size="20px"
+							circle
+							no-shadow
+						/>
+						<span class="min-w-0 truncate">{{ linkedAccount.username }}</span>
+					</span>
+					<span v-else class="font-semibold text-primary">{{
+						formatMessage(messages.linkedAccountFallback)
+					}}</span>
+					<span>{{ formatMessage(messages.lockedEmptyDescriptionSuffix) }}</span>
+				</span>
+			</template>
+			<template #actions>
+				<ButtonStyled color="brand"
+					><button class="!h-10" @click="signInToShare">
+						<LogInIcon aria-hidden="true" />{{ formatMessage(lockedActionButton) }}
+					</button></ButtonStyled
+				>
+			</template>
+		</SharedInstanceShareEmptyState>
+
+		<SharedInstanceShareEmptyState
+			v-else
+			:heading="formatMessage(messages.noFriendsInvitedHeading)"
+			:description="formatMessage(messages.noFriendsInvitedDescription)"
+		>
+			<template #actions>
+				<ButtonStyled color="brand"
+					><button
+						class="!h-10"
+						:disabled="inviteLink.pending.value"
+						@click="showInvitePlayers($event)"
+					>
+						<SpinnerIcon
+							v-if="inviteLink.pending.value"
+							class="animate-spin"
+							aria-hidden="true"
+						/><UserPlusIcon v-else aria-hidden="true" />{{
+							formatMessage(messages.inviteFriendsButton)
+						}}
+					</button></ButtonStyled
+				>
+			</template>
+		</SharedInstanceShareEmptyState>
+	</div>
+</template>
+
+<script setup lang="ts">
+import { LogInIcon, SpinnerIcon, UserPlusIcon } from '@modrinth/assets'
+import {
+	Avatar,
+	ButtonStyled,
+	ConfirmUnlinkModal,
+	defineMessages,
+	injectAuth,
+	type InvitePlayersInvitePayload,
+	InvitePlayersModal,
+	type InvitePlayersUser,
+	useVIntl,
+} from '@modrinth/ui'
+import { useQueryClient } from '@tanstack/vue-query'
+import { openUrl } from '@tauri-apps/plugin-opener'
+import { computed, ref, toRef, watch } from 'vue'
+
+import ModrinthAccountRequiredModal from '@/components/ui/modal/ModrinthAccountRequiredModal.vue'
+import SharedInstancePublishModal from '@/components/ui/shared-instances/SharedInstancePublishModal.vue'
+import {
+	getSharedInstanceUnavailableReason,
+	isSharedInstanceUnavailableError,
+} from '@/helpers/install'
+import { edit } from '@/helpers/instance'
+import type { ModrinthAuthFlow } from '@/helpers/mr_auth.ts'
+import {
+	sharedInstanceErrorMessages,
+	useSharedInstanceErrors,
+} from '@/helpers/shared-instance-errors'
+import type { GameInstance } from '@/helpers/types'
+import { provideInstanceBackup } from '@/providers/instance-backup'
+
+import { injectSharedInstanceState } from '../use-shared-instance-state'
+import SharedInstanceMembersTable from './shared-instance-members-table.vue'
+import SharedInstanceRemoveMemberModal from './shared-instance-remove-member-modal.vue'
+import SharedInstanceShareEmptyState from './shared-instance-share-empty-state.vue'
+import type { ShareRow } from './shared-instance-share-types'
+import { useSharedInstanceInviteCandidates } from './use-shared-instance-invite-candidates'
+import { useSharedInstanceInviteLink } from './use-shared-instance-invite-link'
+import { useSharedInstanceMembers } from './use-shared-instance-members'
+
+const props = defineProps<{
+	instance: GameInstance
+	offline?: boolean
+}>()
+const auth = injectAuth()
+const queryClient = useQueryClient()
+const { formatMessage } = useVIntl()
+const {
+	formatSharedInstanceUnavailable,
+	notifySharedInstanceError,
+	notifySharedInstanceUnavailable,
+} = useSharedInstanceErrors()
+const sharedInstanceState = injectSharedInstanceState()
+const instance = toRef(props, 'instance')
+const actionsLocked = sharedInstanceState.shareActionsLocked
+const sharedInstanceActionsLocked = actionsLocked
+const currentUserId = computed(() => auth.user.value?.id ?? null)
+const isSignedIn = computed(() => !!auth.session_token.value)
+const accountRequiredModal = ref<InstanceType<typeof ModrinthAccountRequiredModal>>()
+const invitePlayersModal = ref<InstanceType<typeof InvitePlayersModal>>()
+const unlinkModal = ref<InstanceType<typeof ConfirmUnlinkModal>>()
+const removeMemberModal = ref<InstanceType<typeof SharedInstanceRemoveMemberModal>>()
+const publishModal = ref<InstanceType<typeof SharedInstancePublishModal>>()
+const publishState = ref<'idle' | 'reviewing' | 'publishing'>('idle')
+const pendingRemovalRow = ref<ShareRow | null>(null)
+const importedModpackUnlinked = ref(false)
+
+function notifyOperationError(error: unknown) {
+	if (isSharedInstanceUnavailableError(error)) {
+		notifySharedInstanceUnavailable(
+			getSharedInstanceUnavailableReason(error),
+			sharedInstanceState.unavailableManager.value,
+		)
+	} else {
+		notifySharedInstanceError(error)
+	}
+}
+
+const members = useSharedInstanceMembers({
+	instance,
+	currentUserId,
+	isSignedIn,
+	actionsLocked,
+	onError: notifyOperationError,
+})
+const {
+	inviteFriends,
+	search: searchInviteUsers,
+	requestFriend,
+} = useSharedInstanceInviteCandidates({
+	rows: members.rows,
+	currentUserId,
+	isSignedIn,
+	actionsLocked,
+})
+const inviteLink = useSharedInstanceInviteLink(
+	computed(() => props.instance.id),
+	notifyOperationError,
+)
+
+const linkedAccount = computed(() => {
+	const manager = sharedInstanceState.manager.value
+	return manager?.type === 'user'
+		? { username: manager.name, avatarUrl: manager.avatarUrl, tintBy: manager.tintBy }
+		: null
+})
+const lockedEmptyHeading = computed(() =>
+	isSignedIn.value ? messages.lockedWrongAccountHeading : messages.lockedSignedOutHeading,
+)
+const lockedActionButton = computed(() =>
+	isSignedIn.value ? messages.switchAccountButton : messages.signInButton,
+)
+const sharedInstanceUnavailableReason = sharedInstanceState.unavailableReason
+const sharedInstanceUnavailable = computed(() => !!sharedInstanceUnavailableReason.value)
+const sharedInstanceUnavailableManager = sharedInstanceState.unavailableManager
+const requiresUnlink = computed(
+	() =>
+		props.instance.link?.type === 'imported_modpack' &&
+		!props.instance.shared_instance &&
+		!importedModpackUnlinked.value,
+)
+const importedModpackBackupTip = computed(() =>
+	props.instance.link?.type === 'imported_modpack'
+		? (props.instance.link.name ?? props.instance.link.filename ?? undefined)
+		: undefined,
+)
+
+const messages = defineMessages({
+	signInButton: { id: 'app.instance.share.sign-in.button', defaultMessage: 'Sign in' },
+	noFriendsInvitedHeading: {
+		id: 'app.instance.share.empty.heading',
+		defaultMessage: 'No friends invited',
+	},
+	noFriendsInvitedDescription: {
+		id: 'app.instance.share.empty.description',
+		defaultMessage: 'You can share this instance with your friends!',
+	},
+	inviteFriendsButton: {
+		id: 'app.instance.share.empty.invite-friends-button',
+		defaultMessage: 'Invite friends',
+	},
+	shareModalHeader: {
+		id: 'app.instance.share.invite-modal.heading',
+		defaultMessage: 'Share {name}',
+	},
+	lockedWrongAccountHeading: {
+		id: 'app.instance.share.locked.wrong-account-heading',
+		defaultMessage: 'Wrong account',
+	},
+	lockedSignedOutHeading: {
+		id: 'app.instance.share.locked.signed-out-heading',
+		defaultMessage: 'Not signed in',
+	},
+	lockedEmptyDescriptionPrefix: {
+		id: 'app.instance.share.locked.empty-description-prefix',
+		defaultMessage: 'You need to sign in as',
+	},
+	lockedEmptyDescriptionSuffix: {
+		id: 'app.instance.share.locked.empty-description-suffix',
+		defaultMessage: 'to access this page.',
+	},
+	linkedAccountFallback: {
+		id: 'app.instance.share.locked.linked-account-fallback',
+		defaultMessage: 'the linked account',
+	},
+	switchAccountButton: {
+		id: 'app.instance.share.locked.switch-account-button',
+		defaultMessage: 'Switch account',
+	},
+	unlinkForShareHeader: {
+		id: 'app.instance.share.unlink.header',
+		defaultMessage: 'Sharing requires unlinking',
+	},
+	unlinkForShareBody: {
+		id: 'app.instance.share.unlink.body',
+		defaultMessage: 'You must unlink this modpack to share your instance',
+	},
+})
+
+function invitePlayer(payload: InvitePlayersInvitePayload) {
+	if (actionsLocked.value) return
+	if (payload.source === 'search') void requestFriend(payload.user)
+	members.invite(payload.user)
+}
+function cancelInvite(user: InvitePlayersUser) {
+	const row = members.find(user.id, user.username)
+	if (row) members.remove(row.id)
+}
+async function showInvitePlayers(event?: MouseEvent) {
+	if (actionsLocked.value) return
+	if (!isSignedIn.value) return signInToShare(event)
+	if (requiresUnlink.value) return unlinkModal.value?.show()
+	if (await inviteLink.ensure()) invitePlayersModal.value?.show(event)
+}
+async function unlinkImportedModpack() {
+	try {
+		await edit(props.instance.id, { link: null as unknown as undefined })
+		importedModpackUnlinked.value = true
+		await queryClient.invalidateQueries({ queryKey: ['linkedModpackInfo', props.instance.id] })
+		if (await inviteLink.ensure()) invitePlayersModal.value?.show()
+	} catch (error) {
+		notifyOperationError(error)
+	}
+}
+function showRemoveMemberModal(row: ShareRow) {
+	if (!actionsLocked.value) {
+		pendingRemovalRow.value = row
+		removeMemberModal.value?.show()
+	}
+}
+function reviewUpdate(event: MouseEvent) {
+	publishModal.value?.show(event)
+}
+function removeMember(row: ShareRow) {
+	members.remove(row.id)
+}
+function userProfileLink(username: string) {
+	return !username || username.includes('@')
+		? undefined
+		: () => openUrl(`https://modrinth.com/user/${encodeURIComponent(username)}`)
+}
+async function requestAuth(flow: ModrinthAuthFlow) {
+	await auth.requestSignIn(`/instance/${encodeURIComponent(props.instance.id)}/share`, flow, {
+		showModal: false,
+	})
+	return !!auth.session_token.value
+}
+function signInToShare(event?: MouseEvent) {
+	void accountRequiredModal.value?.show(event)
+}
+
+watch(
+	() => props.instance.id,
+	() => {
+		importedModpackUnlinked.value = false
+	},
+)
+watch(
+	[() => auth.isReady.value, isSignedIn, actionsLocked],
+	([ready, signedIn, locked]) => {
+		if (ready && !signedIn && !locked) signInToShare()
+	},
+	{ immediate: true, flush: 'post' },
+)
+
+provideInstanceBackup(() => props.instance)
+</script>
diff --git a/apps/app-frontend/src/pages/instance/share/shared-instance-members-table.vue b/apps/app-frontend/src/pages/instance/share/shared-instance-members-table.vue
new file mode 100644
index 000000000..223c915c0
--- /dev/null
+++ b/apps/app-frontend/src/pages/instance/share/shared-instance-members-table.vue
@@ -0,0 +1,304 @@
+<template>
+	<div class="flex flex-col gap-4">
+		<div class="flex flex-col gap-4">
+			<div class="flex items-center gap-2">
+				<StyledInput
+					v-model="search"
+					:icon="SearchIcon"
+					:placeholder="`Search ${rows.length} users...`"
+					wrapper-class="min-w-0 flex-1"
+					input-class="!h-10"
+					clearable
+				/>
+				<template v-if="!actionsLocked">
+					<ButtonStyled>
+						<button
+							class="flex !h-10 shrink-0 items-center gap-2"
+							:disabled="pushUpdateDisabled"
+							@click="emit('push-update', $event)"
+						>
+							<SpinnerIcon v-if="pushUpdatePending" class="animate-spin" aria-hidden="true" />
+							<UploadIcon v-else aria-hidden="true" />
+							{{ formatMessage(messages.pushUpdate) }}
+						</button>
+					</ButtonStyled>
+					<ButtonStyled color="brand">
+						<button
+							class="flex !h-10 shrink-0 items-center gap-2"
+							:disabled="invitePending"
+							@click="emit('invite', $event)"
+						>
+							<SpinnerIcon v-if="invitePending" class="animate-spin" aria-hidden="true" />
+							<UserPlusIcon v-else aria-hidden="true" />
+							Invite friends
+						</button>
+					</ButtonStyled>
+				</template>
+			</div>
+			<div class="flex flex-wrap items-center gap-1.5">
+				<FilterIcon class="size-5 shrink-0 text-secondary" aria-hidden="true" />
+				<button
+					:class="filterClass(methodFilter === 'all')"
+					:aria-pressed="methodFilter === 'all'"
+					@click="methodFilter = 'all'"
+				>
+					All
+				</button>
+				<button
+					v-for="option in methodFilterOptions"
+					:key="option.id"
+					:class="filterClass(methodFilter === option.id)"
+					:aria-pressed="methodFilter === option.id"
+					@click="toggleMethodFilter(option.id)"
+				>
+					{{ option.label }}
+				</button>
+			</div>
+		</div>
+
+		<Table
+			v-model:sort-column="sortColumn"
+			v-model:sort-direction="sortDirection"
+			:columns="columns"
+			:data="sortedRows"
+			row-key="id"
+			table-min-width="42rem"
+			@sort="handleSort"
+		>
+			<template #empty-state
+				><div class="flex h-64 items-center justify-center text-secondary">
+					No users match your filters.
+				</div></template
+			>
+			<template #cell-username="{ row }">
+				<div class="flex min-w-0 max-w-full items-center gap-2">
+					<AutoLink
+						v-tooltip="truncatedTooltip(usernameRefs[row.id], row.username)"
+						:to="userProfileLink(row.username)"
+						class="inline-flex max-w-full min-w-0 items-center gap-2 text-primary hover:underline"
+					>
+						<Avatar
+							:src="row.avatarUrl"
+							:alt="`${row.username}'s avatar`"
+							:tint-by="row.username"
+							size="24px"
+							circle
+							no-shadow
+						/>
+						<span
+							:ref="(element) => setUsernameRef(row.id, element)"
+							class="min-w-0 truncate font-medium"
+							>{{ row.username }}</span
+						>
+					</AutoLink>
+				</div>
+			</template>
+			<template #cell-lastPlayed="{ row }">
+				<span v-if="row.lastPlayedAt" v-tooltip="formatDateTime(row.lastPlayedAt)">{{
+					formatRelativeTime(row.lastPlayedAt)
+				}}</span>
+				<span v-else>Never</span>
+			</template>
+			<template #cell-joined="{ row }">
+				<span
+					v-if="row.pending"
+					class="inline-flex h-7 items-center rounded-full border border-surface-5 border-solid bg-surface-4 px-2.5 py-1 text-sm font-semibold text-secondary"
+					>Pending</span
+				>
+				<span v-else-if="row.joinedAt" v-tooltip="formatDateTime(row.joinedAt)">{{
+					formatRelativeTime(row.joinedAt)
+				}}</span>
+			</template>
+			<template #cell-method="{ row }">
+				<span class="inline-flex min-w-0 items-center gap-2">
+					<UserPlusIcon v-if="row.method === 'direct'" class="size-5 shrink-0" aria-hidden="true" />
+					<LinkIcon v-else class="size-5 shrink-0" aria-hidden="true" />
+					<span class="min-w-0 truncate">{{ methodLabels[row.method] }}</span>
+				</span>
+			</template>
+			<template #cell-actions="{ row }">
+				<div v-if="!actionsLocked" class="flex items-center justify-end">
+					<ButtonStyled circular type="transparent"
+						><button
+							v-tooltip="'Revoke access'"
+							:aria-label="`Revoke access for ${row.username}`"
+							class="text-secondary hover:!filter-none hover:text-red focus-visible:!filter-none"
+							@click="emit('remove', row)"
+						>
+							<XIcon aria-hidden="true" /></button
+					></ButtonStyled>
+				</div>
+			</template>
+		</Table>
+	</div>
+</template>
+
+<script setup lang="ts">
+import {
+	FilterIcon,
+	LinkIcon,
+	SearchIcon,
+	SpinnerIcon,
+	UploadIcon,
+	UserPlusIcon,
+	XIcon,
+} from '@modrinth/assets'
+import {
+	AutoLink,
+	Avatar,
+	ButtonStyled,
+	defineMessages,
+	type SortDirection,
+	StyledInput,
+	Table,
+	type TableColumn,
+	truncatedTooltip,
+	useFormatDateTime,
+	useRelativeTime,
+	useVIntl,
+} from '@modrinth/ui'
+import { openUrl } from '@tauri-apps/plugin-opener'
+import { computed, ref } from 'vue'
+
+import {
+	type MethodFilter,
+	methodLabels,
+	type ShareMethod,
+	type ShareRow,
+	type ShareTableColumn,
+} from './shared-instance-share-types'
+
+const props = defineProps<{
+	rows: ShareRow[]
+	actionsLocked?: boolean
+	invitePending?: boolean
+	pushUpdateDisabled?: boolean
+	pushUpdatePending?: boolean
+}>()
+const emit = defineEmits<{
+	invite: [event: MouseEvent]
+	remove: [row: ShareRow]
+	'push-update': [event: MouseEvent]
+}>()
+const search = ref('')
+const methodFilter = ref<MethodFilter>('all')
+const sortColumn = ref<string | undefined>('joined')
+const sortDirection = ref<SortDirection>('desc')
+const usernameRefs = ref<Record<string, HTMLElement | null>>({})
+const { formatMessage } = useVIntl()
+const formatRelativeTime = useRelativeTime({ style: 'narrow' })
+const formatDateTime = useFormatDateTime({ dateStyle: 'medium', timeStyle: 'short' })
+const methodFilterOptions: Array<{ id: ShareMethod; label: string }> = [
+	{ id: 'direct', label: methodLabels.direct },
+	{ id: 'link', label: methodLabels.link },
+]
+const columns = computed<TableColumn<ShareTableColumn>[]>(() => {
+	const result: TableColumn<ShareTableColumn>[] = [
+		{
+			key: 'username',
+			label: 'Username',
+			width: 'clamp(14rem, 30%, 26rem)',
+			enableSorting: true,
+			headerClass: '!pr-3',
+			cellClass: '!pr-3',
+		},
+		{
+			key: 'lastPlayed',
+			label: 'Last played',
+			width: 'clamp(7rem, 15%, 13rem)',
+			enableSorting: true,
+			headerClass: 'whitespace-nowrap !px-2',
+			cellClass: 'whitespace-nowrap !px-2',
+		},
+		{
+			key: 'joined',
+			label: 'Joined',
+			width: 'clamp(7rem, 14%, 12rem)',
+			enableSorting: true,
+			defaultSortDirection: 'desc',
+			headerClass: 'whitespace-nowrap !px-2',
+			cellClass: 'whitespace-nowrap !px-2',
+		},
+		{
+			key: 'method',
+			label: 'Method',
+			enableSorting: true,
+			headerClass: 'whitespace-nowrap !px-2',
+			cellClass: 'whitespace-nowrap !px-2',
+		},
+	]
+	if (!props.actionsLocked)
+		result.push({
+			key: 'actions',
+			label: 'Actions',
+			align: 'right',
+			width: 'clamp(5.5rem, 7%, 7rem)',
+			headerClass: 'whitespace-nowrap !pl-2 !pr-4',
+			cellClass: 'whitespace-nowrap !pl-2 !pr-4',
+		})
+	return result
+})
+const filteredRows = computed(() => {
+	const query = search.value.trim().toLowerCase()
+	return props.rows.filter((row) => {
+		if (methodFilter.value !== 'all' && row.method !== methodFilter.value) return false
+		if (!query) return true
+		return [
+			row.username,
+			row.lastPlayedAt ? formatRelativeTime(row.lastPlayedAt) : 'Never',
+			row.pending ? 'Pending' : row.joinedAt ? formatRelativeTime(row.joinedAt) : '',
+			methodLabels[row.method],
+		].some((value) => value.toLowerCase().includes(query))
+	})
+})
+const sortedRows = computed(() => [...filteredRows.value].sort(compareRows))
+
+function compareRows(a: ShareRow, b: ShareRow) {
+	let compared: number
+	if (sortColumn.value === 'username') compared = a.username.localeCompare(b.username)
+	else if (sortColumn.value === 'lastPlayed')
+		compared =
+			(a.lastPlayedAt?.getTime() ?? Number.NEGATIVE_INFINITY) -
+			(b.lastPlayedAt?.getTime() ?? Number.NEGATIVE_INFINITY)
+	else if (sortColumn.value === 'method')
+		compared = methodLabels[a.method].localeCompare(methodLabels[b.method])
+	else
+		compared =
+			(a.pending ? Number.MAX_SAFE_INTEGER : (a.joinedAt?.getTime() ?? Number.NEGATIVE_INFINITY)) -
+				(b.pending
+					? Number.MAX_SAFE_INTEGER
+					: (b.joinedAt?.getTime() ?? Number.NEGATIVE_INFINITY)) ||
+			a.username.localeCompare(b.username)
+	return sortDirection.value === 'asc' ? compared : -compared
+}
+function handleSort(column: string, direction: SortDirection) {
+	sortColumn.value = column
+	sortDirection.value = direction
+}
+function toggleMethodFilter(filter: ShareMethod) {
+	methodFilter.value = methodFilter.value === filter ? 'all' : filter
+}
+function filterClass(active: boolean) {
+	return [
+		'cursor-pointer rounded-full border border-solid px-3 py-1.5 text-base font-semibold leading-5 transition-all duration-100 active:scale-[0.97]',
+		active
+			? 'border-green bg-brand-highlight text-brand'
+			: 'border-surface-5 bg-surface-4 text-primary hover:bg-surface-5',
+	]
+}
+
+const messages = defineMessages({
+	pushUpdate: {
+		id: 'app.instance.admonitions.shared-instance.publish-button',
+		defaultMessage: 'Push update',
+	},
+})
+function userProfileLink(username: string) {
+	return !username || username.includes('@')
+		? undefined
+		: () => openUrl(`https://modrinth.com/user/${encodeURIComponent(username)}`)
+}
+function setUsernameRef(id: string, element: Element | null) {
+	usernameRefs.value[id] = element instanceof HTMLElement ? element : null
+}
+</script>
diff --git a/apps/app-frontend/src/pages/instance/share/shared-instance-remove-member-modal.vue b/apps/app-frontend/src/pages/instance/share/shared-instance-remove-member-modal.vue
new file mode 100644
index 000000000..1f7983dcd
--- /dev/null
+++ b/apps/app-frontend/src/pages/instance/share/shared-instance-remove-member-modal.vue
@@ -0,0 +1,122 @@
+<template>
+	<NewModal
+		ref="modal"
+		:header="formatMessage(messages.header)"
+		max-width="470px"
+		@after-hide="emit('clear')"
+	>
+		<div class="flex flex-col gap-4">
+			<Admonition type="warning">{{ formatMessage(messages.warning, { username }) }}</Admonition>
+			<div class="flex min-w-0 items-center gap-2 rounded-[20px] bg-surface-2 p-3">
+				<Avatar
+					:src="row?.avatarUrl"
+					:alt="formatMessage(messages.avatarAlt, { username })"
+					:tint-by="username"
+					size="40px"
+					circle
+					no-shadow
+				/>
+				<div class="flex min-w-0 flex-1 flex-col gap-0.5">
+					<span class="min-w-0 truncate font-medium text-contrast">{{ username }}</span>
+					<span class="truncate text-sm text-secondary">{{
+						row ? methodLabels[row.method] : ''
+					}}</span>
+				</div>
+			</div>
+			<div class="flex flex-col gap-2">
+				<span class="font-semibold text-contrast">{{ formatMessage(messages.effectsLabel) }}</span>
+				<ul class="m-0 list-disc pl-6 text-primary">
+					<li v-for="effect in effects" :key="effect.id" class="leading-6 marker:text-secondary">
+						{{ formatMessage(effect) }}
+					</li>
+				</ul>
+			</div>
+			<div class="flex justify-end gap-2 pt-1">
+				<ButtonStyled type="outlined"
+					><button class="!border !border-surface-5" @click="modal?.hide()">
+						<XIcon aria-hidden="true" />{{ formatMessage(commonMessages.cancelButton) }}
+					</button></ButtonStyled
+				>
+				<ButtonStyled color="orange"
+					><button :disabled="!row" @click="confirm">
+						<UserXIcon aria-hidden="true" />{{ formatMessage(messages.removeButton) }}
+					</button></ButtonStyled
+				>
+			</div>
+		</div>
+	</NewModal>
+</template>
+
+<script setup lang="ts">
+import { UserXIcon, XIcon } from '@modrinth/assets'
+import {
+	Admonition,
+	Avatar,
+	ButtonStyled,
+	commonMessages,
+	defineMessages,
+	NewModal,
+	useVIntl,
+} from '@modrinth/ui'
+import { computed, ref } from 'vue'
+
+import { methodLabels, type ShareRow } from './shared-instance-share-types'
+
+const props = defineProps<{ row: ShareRow | null; memberCount: number }>()
+const emit = defineEmits<{ confirm: [row: ShareRow]; clear: [] }>()
+const modal = ref<InstanceType<typeof NewModal>>()
+const { formatMessage } = useVIntl()
+const username = computed(() => props.row?.username ?? '')
+const messages = defineMessages({
+	header: { id: 'app.instance.share.remove-user-modal.header', defaultMessage: 'Revoke access' },
+	warning: {
+		id: 'app.instance.share.remove-user-modal.warning-body',
+		defaultMessage:
+			"If you revoke {username}'s access to this shared instance, you'll need to invite them again before they can receive updates.",
+	},
+	avatarAlt: {
+		id: 'app.instance.share.remove-user-modal.user-avatar-alt',
+		defaultMessage: "{username}'s avatar",
+	},
+	effectsLabel: {
+		id: 'app.instance.share.remove-user-modal.effects-label',
+		defaultMessage: 'What happens?',
+	},
+	effectAccess: {
+		id: 'app.instance.share.remove-user-modal.effect-access',
+		defaultMessage: 'They will no longer receive updates for this shared instance',
+	},
+	effectInstalledCopy: {
+		id: 'app.instance.share.remove-user-modal.effect-installed-copy',
+		defaultMessage: 'Any copy they already installed will stay on their device',
+	},
+	effectInviteAgain: {
+		id: 'app.instance.share.remove-user-modal.effect-invite-again',
+		defaultMessage: 'You can invite them again later',
+	},
+	effectLastUser: {
+		id: 'app.instance.share.remove-user-modal.effect-last-user',
+		defaultMessage: 'This is the last user, sharing will be turned off for this instance',
+	},
+	removeButton: {
+		id: 'app.instance.share.remove-user-modal.remove-button',
+		defaultMessage: 'Revoke access',
+	},
+})
+const effects = computed(() => {
+	const result = [messages.effectAccess, messages.effectInstalledCopy, messages.effectInviteAgain]
+	if (props.memberCount === 1) result.push(messages.effectLastUser)
+	return result
+})
+
+function show(event?: MouseEvent) {
+	modal.value?.show(event)
+}
+function confirm() {
+	if (props.row) {
+		modal.value?.hide()
+		emit('confirm', props.row)
+	}
+}
+defineExpose({ show })
+</script>
diff --git a/apps/app-frontend/src/pages/instance/share/shared-instance-share-empty-state.vue b/apps/app-frontend/src/pages/instance/share/shared-instance-share-empty-state.vue
new file mode 100644
index 000000000..22839fe4d
--- /dev/null
+++ b/apps/app-frontend/src/pages/instance/share/shared-instance-share-empty-state.vue
@@ -0,0 +1,15 @@
+<template>
+	<EmptyState type="empty-inbox">
+		<template #heading>{{ heading }}</template>
+		<template #description
+			><slot name="description">{{ description }}</slot></template
+		>
+		<template v-if="$slots.actions" #actions><slot name="actions" /></template>
+	</EmptyState>
+</template>
+
+<script setup lang="ts">
+import { EmptyState } from '@modrinth/ui'
+
+defineProps<{ heading: string; description?: string }>()
+</script>
diff --git a/apps/app-frontend/src/pages/instance/share/shared-instance-share-types.ts b/apps/app-frontend/src/pages/instance/share/shared-instance-share-types.ts
new file mode 100644
index 000000000..a6e478ba4
--- /dev/null
+++ b/apps/app-frontend/src/pages/instance/share/shared-instance-share-types.ts
@@ -0,0 +1,20 @@
+export type ShareMethod = 'direct' | 'link'
+export type MethodFilter = ShareMethod | 'all'
+export type ShareTableColumn = 'username' | 'lastPlayed' | 'joined' | 'method' | 'actions'
+
+export type ShareRow = {
+	id: string
+	username: string
+	avatarUrl?: string
+	lastPlayedAt: Date | null
+	joinedAt: Date | null
+	method: ShareMethod
+	pending?: boolean
+}
+
+export const methodLabels: Record<ShareMethod, string> = {
+	direct: 'Direct invite',
+	link: 'Share link',
+}
+
+export { normalizeInviteKey } from '@modrinth/ui'
diff --git a/apps/app-frontend/src/pages/instance/share/use-shared-instance-invite-candidates.ts b/apps/app-frontend/src/pages/instance/share/use-shared-instance-invite-candidates.ts
new file mode 100644
index 000000000..b25e9e91d
--- /dev/null
+++ b/apps/app-frontend/src/pages/instance/share/use-shared-instance-invite-candidates.ts
@@ -0,0 +1,105 @@
+import {
+	injectNotificationManager,
+	type InvitePlayersSearchUser,
+	type InvitePlayersUser,
+} from '@modrinth/ui'
+import { computed, type Ref } from 'vue'
+
+import { useFriends } from '@/composables/use-friends'
+import { getFriendUserId } from '@/helpers/friends.ts'
+import { get as getCredentials } from '@/helpers/mr_auth.ts'
+import { search_user } from '@/helpers/users.ts'
+
+import { normalizeInviteKey, type ShareRow } from './shared-instance-share-types'
+
+export function useSharedInstanceInviteCandidates(options: {
+	rows: Ref<ShareRow[]>
+	currentUserId: Ref<string | null>
+	isSignedIn: Ref<boolean>
+	actionsLocked: Ref<boolean>
+}) {
+	const { handleError } = injectNotificationManager()
+	const friendsState = useFriends({
+		currentUserId: options.currentUserId,
+		getCredentials,
+		enabled: computed(
+			() =>
+				options.isSignedIn.value && !!options.currentUserId.value && !options.actionsLocked.value,
+		),
+		onError: handleError,
+	})
+	const friends = friendsState.friends
+	const invitedRows = computed(() => {
+		const invited = new Map<string, ShareRow>()
+		for (const row of options.rows.value) {
+			invited.set(normalizeInviteKey(row.id), row)
+			invited.set(normalizeInviteKey(row.username), row)
+		}
+		return invited
+	})
+	const inviteFriends = computed<InvitePlayersUser[]>(() =>
+		friends.value
+			.filter((friend) => friend.username && friend.accepted)
+			.sort((a, b) => Number(b.online) - Number(a.online))
+			.map((friend) => {
+				const id = getFriendUserId(friend, options.currentUserId.value)
+				const invited =
+					invitedRows.value.get(normalizeInviteKey(id)) ??
+					invitedRows.value.get(normalizeInviteKey(friend.username))
+				return {
+					id,
+					username: friend.username,
+					avatarUrl: friend.avatar,
+					online: friend.online,
+					status: invited ? (invited.pending ? 'pending' : 'added') : 'available',
+				}
+			}),
+	)
+	const candidateKeys = computed(() => {
+		const keys = new Set<string>()
+		for (const friend of inviteFriends.value) {
+			keys.add(normalizeInviteKey(friend.id))
+			keys.add(normalizeInviteKey(friend.username))
+		}
+		return keys
+	})
+
+	async function search(query: string): Promise<InvitePlayersSearchUser[]> {
+		if (options.actionsLocked.value) return []
+		const credentials = await getCredentials()
+		const ownUserId = options.currentUserId.value ?? credentials?.user_id ?? null
+		return (await search_user(query))
+			.filter((user) => user.id !== ownUserId)
+			.filter((user) => {
+				const id = normalizeInviteKey(user.id)
+				const username = normalizeInviteKey(user.username)
+				return (
+					!candidateKeys.value.has(id) &&
+					!candidateKeys.value.has(username) &&
+					!invitedRows.value.has(id) &&
+					!invitedRows.value.has(username)
+				)
+			})
+			.map((user) => ({
+				id: user.id,
+				username: user.username,
+				avatarUrl: user.avatar_url || undefined,
+			}))
+	}
+
+	async function requestFriend(user: InvitePlayersUser) {
+		if (options.actionsLocked.value) return
+		const credentials = await getCredentials()
+		const ownUserId = options.currentUserId.value ?? credentials?.user_id ?? null
+		if (ownUserId && normalizeInviteKey(user.id) === normalizeInviteKey(ownUserId)) return
+		if (!friendsState.findFriend(user.id, user.username)) {
+			friendsState.requestFriend({
+				id: user.id,
+				username: user.username,
+				avatarUrl: user.avatarUrl,
+			})
+		}
+	}
+
+	return { inviteFriends, search, requestFriend }
+}
diff --git a/apps/app-frontend/src/pages/instance/share/use-shared-instance-invite-link.ts b/apps/app-frontend/src/pages/instance/share/use-shared-instance-invite-link.ts
new file mode 100644
index 000000000..7a7d0a77a
--- /dev/null
+++ b/apps/app-frontend/src/pages/instance/share/use-shared-instance-invite-link.ts
@@ -0,0 +1,63 @@
+import type { InviteLinkSettings } from '@modrinth/ui'
+import { computed, type Ref, ref, watch } from 'vue'
+
+import { config } from '@/config'
+import { toError } from '@/helpers/errors'
+import { create_shared_instance_invite_link } from '@/helpers/instance'
+
+export function useSharedInstanceInviteLink(
+	instanceId: Ref<string>,
+	onError: (error: unknown) => void,
+) {
+	const details = ref<Awaited<ReturnType<typeof create_shared_instance_invite_link>>>()
+	const pending = ref(false)
+	const link = computed(() =>
+		details.value
+			? `${config.siteUrl}/share/${encodeURIComponent(details.value.inviteId)}`
+			: undefined,
+	)
+
+	async function ensure() {
+		if (details.value) return true
+		if (pending.value) return false
+
+		pending.value = true
+		try {
+			details.value = await create_shared_instance_invite_link(instanceId.value)
+			return true
+		} catch (error) {
+			onError(error)
+			return false
+		} finally {
+			pending.value = false
+		}
+	}
+
+	async function update(settings: InviteLinkSettings) {
+		if (!details.value) return
+
+		pending.value = true
+		try {
+			const maxAgeSeconds = Math.max(
+				1,
+				Math.min(604800, Math.floor((settings.expiresAt.getTime() - Date.now()) / 1000)),
+			)
+			details.value = await create_shared_instance_invite_link(instanceId.value, {
+				maxAgeSeconds,
+				maxUses: settings.maxUses,
+				replaceInviteId: details.value.inviteId,
+			})
+		} catch (error) {
+			throw toError(error)
+		} finally {
+			pending.value = false
+		}
+	}
+
+	watch(instanceId, () => {
+		details.value = undefined
+		pending.value = false
+	})
+
+	return { details, pending, link, ensure, update }
+}
diff --git a/apps/app-frontend/src/pages/instance/share/use-shared-instance-members.ts b/apps/app-frontend/src/pages/instance/share/use-shared-instance-members.ts
new file mode 100644
index 000000000..48bca947e
--- /dev/null
+++ b/apps/app-frontend/src/pages/instance/share/use-shared-instance-members.ts
@@ -0,0 +1,241 @@
+import type { InvitePlayersUser } from '@modrinth/ui'
+import { useMutation, useQuery, useQueryClient } from '@tanstack/vue-query'
+import { computed, type Ref } from 'vue'
+
+import { get_user_many } from '@/helpers/cache.js'
+import {
+	get_shared_instance_users,
+	invite_shared_instance_users,
+	remove_shared_instance_users,
+	type SharedInstanceUser,
+	type SharedInstanceUsers,
+} from '@/helpers/instance'
+import type { GameInstance } from '@/helpers/types'
+
+import { normalizeInviteKey, type ShareRow } from './shared-instance-share-types'
+
+type MembersQueryKey = readonly ['sharedInstanceUsers', string]
+
+type OptimisticChange = {
+	queryKey: MembersQueryKey
+	userId: string
+	previousRow?: ShareRow
+	previousIndex: number
+}
+
+type InviteVariables = {
+	user: InvitePlayersUser
+	change: OptimisticChange
+}
+
+type RemoveVariables = {
+	id: string
+	hasPendingRecipients: boolean
+	change: OptimisticChange
+}
+
+export function useSharedInstanceMembers(options: {
+	instance: Ref<GameInstance>
+	currentUserId: Ref<string | null>
+	isSignedIn: Ref<boolean>
+	actionsLocked: Ref<boolean>
+	onError: (error: unknown) => void
+}) {
+	const queryClient = useQueryClient()
+	const queryKey = computed(() => ['sharedInstanceUsers', options.instance.value.id] as const)
+	const invitingUserIds = new Set<string>()
+	const removingUserIds = new Set<string>()
+
+	const query = useQuery({
+		queryKey,
+		queryFn: ({ queryKey }) => fetchRows(queryKey),
+		enabled: () =>
+			options.isSignedIn.value && !!options.instance.value.id && !options.actionsLocked.value,
+		staleTime: Infinity,
+		refetchOnMount: 'always',
+		refetchOnReconnect: false,
+		refetchOnWindowFocus: false,
+	})
+	const rows = computed(() => query.data.value ?? [])
+
+	const inviteMutation = useMutation({
+		mutationFn: ({ user, change }: InviteVariables) =>
+			invite_shared_instance_users(change.queryKey[1], [user.id]),
+		onError: (error, { change }) => {
+			rollback(change)
+			options.onError(error)
+		},
+		onSettled: (_data, _error, { user }) => {
+			invitingUserIds.delete(normalizeInviteKey(user.id))
+		},
+	})
+
+	const removeMutation = useMutation({
+		mutationFn: ({ id, hasPendingRecipients, change }: RemoveVariables) =>
+			remove_shared_instance_users(change.queryKey[1], [id], hasPendingRecipients),
+		onError: (error, { change }) => {
+			rollback(change)
+			options.onError(error)
+		},
+		onSettled: (_data, _error, { id }) => {
+			removingUserIds.delete(normalizeInviteKey(id))
+		},
+	})
+
+	async function fetchRows(activeQueryKey: MembersQueryKey) {
+		const users = await get_shared_instance_users(activeQueryKey[1])
+		const loadedRows = await usersToRows(users)
+		const currentRows = queryClient.getQueryData<ShareRow[]>(activeQueryKey) ?? []
+		return preserveRowOrder(loadedRows, currentRows)
+	}
+
+	async function usersToRows(users: SharedInstanceUsers): Promise<ShareRow[]> {
+		const excludedIds = new Set(
+			[options.instance.value.shared_instance?.manager_id, options.currentUserId.value].filter(
+				(id): id is string => !!id,
+			),
+		)
+		const usersToDisplay = userEntries(users).filter((user) => !excludedIds.has(user.id))
+		if (usersToDisplay.length === 0) return []
+
+		const profiles = (await get_user_many(usersToDisplay.map((user) => user.id))) as Array<{
+			id: string
+			username?: string
+			avatar_url?: string | null
+		}>
+
+		return usersToDisplay.map((user) => {
+			const profile = profiles.find((candidate) => candidate.id === user.id)
+			const joinedAt = parseDate(user.joined_at)
+			return {
+				id: user.id,
+				username: profile?.username ?? user.id,
+				avatarUrl: profile?.avatar_url ?? undefined,
+				lastPlayedAt: parseDate(user.last_played),
+				joinedAt,
+				method: user.join_type === 'link' ? 'link' : 'direct',
+				pending: !joinedAt,
+			}
+		})
+	}
+
+	function find(id: string, username: string) {
+		const normalizedId = normalizeInviteKey(id)
+		const normalizedUsername = normalizeInviteKey(username)
+		return rows.value.find(
+			(row) =>
+				normalizeInviteKey(row.id) === normalizedId ||
+				normalizeInviteKey(row.username) === normalizedUsername,
+		)
+	}
+
+	function invite(user: InvitePlayersUser) {
+		const normalizedId = normalizeInviteKey(user.id)
+		if (
+			options.actionsLocked.value ||
+			invitingUserIds.has(normalizedId) ||
+			find(user.id, user.username)
+		) {
+			return
+		}
+
+		invitingUserIds.add(normalizedId)
+		const change = beginOptimisticChange(user.id)
+		updateRows(change.queryKey, (currentRows) => [...currentRows, inviteUserToRow(user)])
+		inviteMutation.mutate({ user, change })
+	}
+
+	function remove(id: string) {
+		const normalizedId = normalizeInviteKey(id)
+		if (options.actionsLocked.value || removingUserIds.has(normalizedId)) return
+
+		removingUserIds.add(normalizedId)
+		const hasPendingRecipients = rows.value.some(
+			(row) => row.pending && normalizeInviteKey(row.id) !== normalizedId,
+		)
+		const change = beginOptimisticChange(id)
+		updateRows(change.queryKey, (currentRows) =>
+			currentRows.filter((row) => normalizeInviteKey(row.id) !== normalizedId),
+		)
+		removeMutation.mutate({ id, hasPendingRecipients, change })
+	}
+
+	function beginOptimisticChange(userId: string): OptimisticChange {
+		const activeQueryKey = queryKey.value
+		void queryClient.cancelQueries({ queryKey: activeQueryKey, exact: true }, { revert: false })
+
+		const currentRows = queryClient.getQueryData<ShareRow[]>(activeQueryKey) ?? []
+		const previousIndex = currentRows.findIndex(
+			(row) => normalizeInviteKey(row.id) === normalizeInviteKey(userId),
+		)
+		return {
+			queryKey: activeQueryKey,
+			userId,
+			previousRow: previousIndex === -1 ? undefined : currentRows[previousIndex],
+			previousIndex,
+		}
+	}
+
+	function rollback(change: OptimisticChange) {
+		const normalizedId = normalizeInviteKey(change.userId)
+		updateRows(change.queryKey, (currentRows) => {
+			const rowsWithoutUser = currentRows.filter(
+				(row) => normalizeInviteKey(row.id) !== normalizedId,
+			)
+			if (!change.previousRow) return rowsWithoutUser
+
+			const previousIndex = Math.min(change.previousIndex, rowsWithoutUser.length)
+			return [
+				...rowsWithoutUser.slice(0, previousIndex),
+				change.previousRow,
+				...rowsWithoutUser.slice(previousIndex),
+			]
+		})
+	}
+
+	function updateRows(activeQueryKey: MembersQueryKey, update: (rows: ShareRow[]) => ShareRow[]) {
+		queryClient.setQueryData<ShareRow[]>(activeQueryKey, (currentRows = []) => update(currentRows))
+	}
+
+	return { rows, query, find, invite, remove }
+}
+
+function userEntries(users: SharedInstanceUsers): SharedInstanceUser[] {
+	if (users.users?.length > 0) return users.users
+	return users.user_ids.map((id) => ({
+		id,
+		joined_at: null,
+		join_type: 'invite',
+		last_played: null,
+	}))
+}
+
+function parseDate(value?: string | null) {
+	if (!value) return null
+	const date = new Date(value)
+	return Number.isNaN(date.getTime()) ? null : date
+}
+
+function inviteUserToRow(user: InvitePlayersUser): ShareRow {
+	return {
+		id: user.id,
+		username: user.username,
+		avatarUrl: user.avatarUrl ?? undefined,
+		lastPlayedAt: null,
+		joinedAt: null,
+		method: 'direct',
+		pending: true,
+	}
+}
+
+function preserveRowOrder(rows: ShareRow[], previousRows: ShareRow[]) {
+	const rowsById = new Map(rows.map((row) => [normalizeInviteKey(row.id), row]))
+	const orderedRows = previousRows.flatMap((previousRow) => {
+		const id = normalizeInviteKey(previousRow.id)
+		const row = rowsById.get(id)
+		if (!row) return []
+		rowsById.delete(id)
+		return [row]
+	})
+	return [...orderedRows, ...rowsById.values()]
+}
diff --git a/apps/app-frontend/src/pages/instance/use-shared-instance-state.ts b/apps/app-frontend/src/pages/instance/use-shared-instance-state.ts
new file mode 100644
index 000000000..408bd3c2c
--- /dev/null
+++ b/apps/app-frontend/src/pages/instance/use-shared-instance-state.ts
@@ -0,0 +1,228 @@
+import { injectAuth } from '@modrinth/ui'
+import { computed, inject, type InjectionKey, provide, type Ref, ref, watch } from 'vue'
+
+import { useUserQuery } from '@/composables/users/use-user-query'
+import {
+	getSharedInstanceUnavailableReason,
+	install_get_shared_instance_update_preview,
+	isSharedInstanceUnavailableError,
+	type SharedInstanceUnavailableReason,
+} from '@/helpers/install'
+import type { GameInstance } from '@/helpers/types'
+
+export type SharedInstanceManager =
+	| {
+			type: 'user'
+			name: string
+			avatarUrl?: string
+			tintBy: string
+	  }
+	| {
+			type: 'server'
+			name: string
+			avatarUrl?: string
+			tintBy: string
+	  }
+
+export function useSharedInstanceState(
+	instance: Ref<GameInstance | undefined>,
+	offline: Ref<boolean>,
+	notifyError: (error: unknown) => void,
+) {
+	const auth = injectAuth()
+	const updatePreview =
+		ref<Awaited<ReturnType<typeof install_get_shared_instance_update_preview>>>(null)
+	const updatePreviewLoaded = ref(false)
+	const unavailableReason = ref<SharedInstanceUnavailableReason | null>(null)
+	const availabilityCheckKey = ref<string | null>(null)
+	const availabilityRefresh = ref(0)
+	let availabilityRequestId = 0
+	let availabilityRequest: {
+		key: string
+		promise: Promise<{
+			preview: Awaited<ReturnType<typeof install_get_shared_instance_update_preview>>
+			error: unknown | null
+		}>
+	} | null = null
+
+	const expectedUserId = computed(() => instance.value?.shared_instance?.linked_user_id ?? null)
+	const wrongAccount = computed(() => {
+		if (auth.isReady && !auth.isReady.value) return false
+		if (!expectedUserId.value) return false
+		return auth.user.value?.id !== expectedUserId.value
+	})
+	const actionsLocked = computed(() => wrongAccount.value)
+	const shareActionsLocked = computed(() => actionsLocked.value || unavailableReason.value !== null)
+	const signedOut = computed(() => !auth.session_token.value)
+	const managerUserId = computed(() => {
+		const attachment = instance.value?.shared_instance
+		if (!attachment) return null
+		if (attachment.role === 'owner') {
+			return actionsLocked.value ? (attachment.linked_user_id ?? null) : null
+		}
+		return attachment.manager_id ?? null
+	})
+	const managerUserQuery = useUserQuery(managerUserId)
+	const manager = computed<SharedInstanceManager | null>(() => {
+		const attachment = instance.value?.shared_instance
+		if (!attachment) return null
+
+		if (attachment.server_manager_name) {
+			return {
+				type: 'server',
+				name: attachment.server_manager_name,
+				avatarUrl: attachment.server_manager_icon_url ?? undefined,
+				tintBy: attachment.server_manager_name,
+			}
+		}
+
+		const user = managerUserQuery.data.value
+		if (!user) return null
+		return {
+			type: 'user',
+			name: user.username,
+			avatarUrl: user.avatar_url ?? undefined,
+			tintBy: user.id,
+		}
+	})
+	const unavailableManager = computed(() => manager.value?.name ?? null)
+
+	function reset() {
+		availabilityRequestId++
+		availabilityRequest = null
+		availabilityCheckKey.value = null
+		updatePreview.value = null
+		updatePreviewLoaded.value = false
+		unavailableReason.value = null
+	}
+
+	function refreshAvailability() {
+		availabilityCheckKey.value = null
+		updatePreviewLoaded.value = false
+		availabilityRefresh.value++
+	}
+
+	function setUnavailable(reason: SharedInstanceUnavailableReason | null) {
+		availabilityRequestId++
+		availabilityRequest = null
+		availabilityCheckKey.value = null
+		updatePreview.value = null
+		updatePreviewLoaded.value = false
+		unavailableReason.value = reason
+	}
+
+	async function checkAvailability(instanceId: string, key: string, throwError = false) {
+		const requestId = ++availabilityRequestId
+		let request = availabilityRequest
+		if (!request || request.key !== key) {
+			const promise = install_get_shared_instance_update_preview(instanceId).then(
+				(preview) => ({ preview, error: null }),
+				(error: unknown) => ({ preview: null, error }),
+			)
+			request = { key, promise }
+			availabilityRequest = request
+			void promise.finally(() => {
+				if (availabilityRequest?.promise === promise) availabilityRequest = null
+			})
+		}
+
+		const result = await request.promise
+		if (!isCurrentRequest(requestId, instanceId, key)) return null
+
+		if (result.error !== null) {
+			updatePreviewLoaded.value = false
+			if (isSharedInstanceUnavailableError(result.error)) {
+				updatePreview.value = null
+				unavailableReason.value = getSharedInstanceUnavailableReason(result.error)
+			} else if (!throwError) {
+				notifyError(result.error)
+			}
+
+			if (throwError) throw result.error
+			return null
+		}
+
+		updatePreview.value = result.preview
+		updatePreviewLoaded.value = true
+		unavailableReason.value = null
+		return result.preview
+	}
+
+	async function refreshUpdatePreview() {
+		const instanceId = instance.value?.id
+		const userId = auth.user.value?.id
+		if (!instanceId || !userId) return null
+
+		const key = `${instanceId}:${userId}`
+		availabilityCheckKey.value = key
+		return await checkAvailability(instanceId, key, true)
+	}
+
+	function isCurrentRequest(requestId: number, instanceId: string, key: string) {
+		return (
+			requestId === availabilityRequestId &&
+			instance.value?.id === instanceId &&
+			availabilityCheckKey.value === key
+		)
+	}
+
+	watch(
+		() => ({
+			refresh: availabilityRefresh.value,
+			instanceId: instance.value?.id,
+			role: instance.value?.shared_instance?.role,
+			locked: actionsLocked.value,
+			offline: offline.value,
+			signedIn: !!auth.session_token.value,
+			userId: auth.user.value?.id ?? null,
+			authReady: auth.isReady?.value ?? true,
+		}),
+		async ({ instanceId, role, locked, offline, signedIn, userId, authReady }) => {
+			if (!instanceId || !role || locked || offline || !authReady || !signedIn || !userId) {
+				availabilityRequestId++
+				availabilityRequest = null
+				availabilityCheckKey.value = null
+				updatePreview.value = null
+				updatePreviewLoaded.value = false
+				if (instanceId && role) unavailableReason.value = null
+				return
+			}
+
+			const key = `${instanceId}:${userId}`
+			if (availabilityCheckKey.value === key) return
+			availabilityCheckKey.value = key
+			await checkAvailability(instanceId, key)
+		},
+		{ immediate: true },
+	)
+
+	return {
+		actionsLocked,
+		shareActionsLocked,
+		unavailableReason,
+		unavailableManager,
+		manager,
+		updatePreview,
+		expectedUserId,
+		wrongAccount,
+		signedOut,
+		reset,
+		refreshAvailability,
+		refreshUpdatePreview,
+		setUnavailable,
+	}
+}
+
+export type SharedInstanceState = ReturnType<typeof useSharedInstanceState>
+
+const sharedInstanceStateKey: InjectionKey<SharedInstanceState> = Symbol('shared-instance-state')
+
+export function provideSharedInstanceState(state: SharedInstanceState) {
+	provide(sharedInstanceStateKey, state)
+}
+
+export function injectSharedInstanceState() {
+	const state = inject(sharedInstanceStateKey)
+	if (!state) throw new Error('Shared instance state has not been provided.')
+	return state
+}
diff --git a/apps/app-frontend/src/pages/project/Index.vue b/apps/app-frontend/src/pages/project/Index.vue
index 52c50fc96..e09914fcc 100644
--- a/apps/app-frontend/src/pages/project/Index.vue
+++ b/apps/app-frontend/src/pages/project/Index.vue
@@ -47,7 +47,7 @@
 		<div class="flex flex-col gap-4 p-6">
 			<div
 				v-if="projectInstallContext"
-				class="sticky top-0 z-20 -mx-6 -mt-6 rounded-tl-[--radius-xl] border-0 border-b border-solid bg-surface-1 p-3 border-surface-5"
+				class="sticky top-0 z-20 -mx-6 -mt-6 rounded-tl-[--radius-xl] border-0 border-b border-solid bg-surface-1 px-3 py-4 border-surface-5"
 			>
 				<BrowseInstallHeader :install-context="projectInstallContext" />
 			</div>
diff --git a/apps/app-frontend/src/providers/instance-backup.ts b/apps/app-frontend/src/providers/instance-backup.ts
new file mode 100644
index 000000000..dee36ebf5
--- /dev/null
+++ b/apps/app-frontend/src/providers/instance-backup.ts
@@ -0,0 +1,25 @@
+import { provideAppBackup } from '@modrinth/ui'
+import { type MaybeRefOrGetter, toValue } from 'vue'
+
+import { install_duplicate_instance, installJobInstanceId } from '@/helpers/install'
+import { edit, list } from '@/helpers/instance'
+import type { GameInstance } from '@/helpers/types'
+
+export function provideInstanceBackup(instance: MaybeRefOrGetter<GameInstance>) {
+	provideAppBackup({
+		async createBackup() {
+			const source = toValue(instance)
+			const prefix = `${source.name} - Backup #`
+			const existingNumbers = (await list())
+				.filter((candidate) => candidate.name.startsWith(prefix))
+				.map((candidate) => Number.parseInt(candidate.name.slice(prefix.length), 10))
+				.filter(Number.isFinite)
+			const nextNumber = existingNumbers.length ? Math.max(...existingNumbers) + 1 : 1
+			const job = await install_duplicate_instance(source.id)
+			const backupInstanceId = installJobInstanceId(job)
+			if (backupInstanceId) {
+				await edit(backupInstanceId, { name: `${prefix}${nextNumber}` })
+			}
+		},
+	})
+}
diff --git a/apps/app-frontend/src/providers/setup/auth.ts b/apps/app-frontend/src/providers/setup/auth.ts
index 8832c09c6..7c688c6fa 100644
--- a/apps/app-frontend/src/providers/setup/auth.ts
+++ b/apps/app-frontend/src/providers/setup/auth.ts
@@ -1,5 +1,11 @@
 import type { Labrinth } from '@modrinth/api-client'
-import { type AuthProvider, type AuthUser, provideAuth } from '@modrinth/ui'
+import {
+	type AuthFlow,
+	type AuthProvider,
+	type AuthRequestOptions,
+	type AuthUser,
+	provideAuth,
+} from '@modrinth/ui'
 import { computed, type Ref, ref, watchEffect } from 'vue'
 
 type AppCredentials = {
@@ -9,7 +15,11 @@ type AppCredentials = {
 
 export function setupAuthProvider(
 	credentials: Ref<AppCredentials | null | undefined>,
-	requestSignIn: (redirectPath: string) => void | Promise<void>,
+	requestSignIn: (
+		redirectPath: string,
+		flow?: AuthFlow,
+		options?: AuthRequestOptions,
+	) => void | Promise<void>,
 ) {
 	const sessionToken = ref<string | null>(null)
 	const user = ref<AuthUser | null>(null)
diff --git a/apps/app-frontend/src/routes.js b/apps/app-frontend/src/routes.js
index 591980575..2baa1edd0 100644
--- a/apps/app-frontend/src/routes.js
+++ b/apps/app-frontend/src/routes.js
@@ -215,6 +215,15 @@ export default new createRouter({
 						breadcrumb: [{ name: '?Instance', link: '/instance/{id}/' }, { name: 'Worlds' }],
 					},
 				},
+				{
+					path: 'share',
+					name: 'InstanceShare',
+					component: Instance.Share,
+					meta: {
+						useRootContext: true,
+						breadcrumb: [{ name: '?Instance', link: '/instance/{id}/' }, { name: 'Share' }],
+					},
+				},
 				{
 					path: '',
 					name: 'Mods',
diff --git a/apps/app-frontend/vite.config.ts b/apps/app-frontend/vite.config.ts
index d97b76d8f..5b5d80d17 100644
--- a/apps/app-frontend/vite.config.ts
+++ b/apps/app-frontend/vite.config.ts
@@ -94,7 +94,7 @@ export default defineConfig({
 	},
 	// to make use of `TAURI_ENV_DEBUG` and other env variables
 	// https://v2.tauri.app/reference/environment-variables/#tauri-cli-hook-commands
-	envPrefix: ['VITE_', 'TAURI_', 'MODRINTH_'],
+	envPrefix: ['VITE_', 'TAURI_', 'MODRINTH_', 'SHARED_INSTANCES_'],
 	build: {
 		rolldownOptions: {
 			onwarn(warning, defaultHandler) {
diff --git a/apps/app/build.rs b/apps/app/build.rs
index 777e94473..56f05012a 100644
--- a/apps/app/build.rs
+++ b/apps/app/build.rs
@@ -55,7 +55,6 @@ fn main() {
                 InlinedPlugin::new()
                     .commands(&[
                         "get_importable_instances",
-                        "import_instance",
                         "is_valid_importable_instance",
                         "get_default_launcher_path",
                     ])
@@ -148,6 +147,11 @@ fn main() {
                         "install_get_modpack_preview",
                         "install_create_instance",
                         "install_create_modpack_instance",
+                        "install_get_shared_instance_preview",
+                        "install_accept_shared_instance_invite",
+                        "install_get_shared_instance_update_preview",
+                        "install_shared_instance",
+                        "install_update_shared_instance",
                         "install_import_instance",
                         "install_duplicate_instance",
                         "install_existing_instance",
@@ -176,6 +180,14 @@ fn main() {
                         DefaultPermissionRule::AllowAllCommands,
                     ),
             )
+            .plugin(
+                "reports",
+                InlinedPlugin::new()
+                    .commands(&["reports_create"])
+                    .default_permission(
+                        DefaultPermissionRule::AllowAllCommands,
+                    ),
+            )
             .plugin(
                 "instance",
                 InlinedPlugin::new()
@@ -211,6 +223,15 @@ fn main() {
                         "instance_kill",
                         "instance_edit",
                         "instance_edit_icon",
+                        "instance_share_can_current_user_use",
+                        "instance_share_get_users",
+                        "instance_share_invite_users",
+                        "instance_share_create_invite_link",
+                        "instance_share_remove_users",
+                        "instance_share_get_publish_preview",
+                        "instance_share_publish",
+                        "instance_share_unlink",
+                        "instance_share_unpublish",
                         "instance_export_mrpack",
                         "instance_get_pack_export_candidates",
                     ])
@@ -252,6 +273,14 @@ fn main() {
                         DefaultPermissionRule::AllowAllCommands,
                     ),
             )
+            .plugin(
+                "users",
+                InlinedPlugin::new()
+                    .commands(&["search_user"])
+                    .default_permission(
+                        DefaultPermissionRule::AllowAllCommands,
+                    ),
+            )
             .plugin(
                 "utils",
                 InlinedPlugin::new()
@@ -276,7 +305,6 @@ fn main() {
                     .commands(&[
                         "init_ads_window",
                         "hide_ads_window",
-                        "scroll_ads_window",
                         "show_ads_window",
                         "show_ads_consent_overlay",
                         "show_ads_consent_preferences",
diff --git a/apps/app/capabilities/plugins.json b/apps/app/capabilities/plugins.json
index 2cb252176..33dcb58f5 100644
--- a/apps/app/capabilities/plugins.json
+++ b/apps/app/capabilities/plugins.json
@@ -102,11 +102,13 @@
 		"instance:default",
 		"install:default",
 		"process:default",
+		"reports:default",
 		"cache:default",
 		"files:default",
 		"settings:default",
 		"shortcuts:default",
 		"tags:default",
+		"users:default",
 		"utils:default",
 		"ads:default",
 		"friends:default",
diff --git a/apps/app/src/api/install.rs b/apps/app/src/api/install.rs
index 96d2f0481..22dcbef21 100644
--- a/apps/app/src/api/install.rs
+++ b/apps/app/src/api/install.rs
@@ -6,6 +6,10 @@ use theseus::data::ModLoader;
 use theseus::install::{
     InstallJobSnapshot, InstallModpackPreview, InstallPostInstallEdit,
 };
+use theseus::instance::{
+    SharedInstanceInstallPreview, SharedInstanceInviteInstallPreview,
+    SharedInstanceUpdatePreview,
+};
 use theseus::pack::import::ImportLauncherType;
 use theseus::pack::install_from::CreatePackLocation;
 use uuid::Uuid;
@@ -16,6 +20,11 @@ pub fn init<R: tauri::Runtime>() -> tauri::plugin::TauriPlugin<R> {
             install_get_modpack_preview,
             install_create_instance,
             install_create_modpack_instance,
+            install_get_shared_instance_preview,
+            install_accept_shared_instance_invite,
+            install_get_shared_instance_update_preview,
+            install_shared_instance,
+            install_update_shared_instance,
             install_import_instance,
             install_duplicate_instance,
             install_existing_instance,
@@ -101,6 +110,67 @@ pub async fn install_create_modpack_instance(
     .await?)
 }
 
+#[tauri::command]
+pub async fn install_get_shared_instance_preview(
+    shared_instance_id: String,
+    name: String,
+) -> Result<SharedInstanceInstallPreview> {
+    Ok(theseus::instance::get_shared_instance_install_preview(
+        &shared_instance_id,
+        name,
+    )
+    .await?)
+}
+
+#[tauri::command]
+pub async fn install_accept_shared_instance_invite(
+    invite_id: String,
+) -> Result<SharedInstanceInviteInstallPreview> {
+    Ok(
+        theseus::instance::accept_shared_instance_invite_for_install(
+            &invite_id,
+        )
+        .await?,
+    )
+}
+
+#[tauri::command]
+pub async fn install_get_shared_instance_update_preview(
+    instance_id: String,
+) -> Result<Option<SharedInstanceUpdatePreview>> {
+    Ok(
+        theseus::instance::get_shared_instance_update_preview(&instance_id)
+            .await?,
+    )
+}
+
+#[tauri::command]
+pub async fn install_shared_instance(
+    shared_instance_id: String,
+    name: String,
+    manager_id: Option<String>,
+    server_manager_name: Option<String>,
+    server_manager_icon_url: Option<String>,
+    instance_icon_url: Option<String>,
+) -> Result<InstallJobSnapshot> {
+    Ok(theseus::instance::install_shared_instance(
+        &shared_instance_id,
+        name,
+        manager_id,
+        server_manager_name,
+        server_manager_icon_url,
+        instance_icon_url,
+    )
+    .await?)
+}
+
+#[tauri::command]
+pub async fn install_update_shared_instance(
+    instance_id: String,
+) -> Result<InstallJobSnapshot> {
+    Ok(theseus::instance::update_shared_instance(&instance_id).await?)
+}
+
 #[tauri::command]
 pub async fn install_import_instance(
     launcher_type: ImportLauncherType,
diff --git a/apps/app/src/api/instance.rs b/apps/app/src/api/instance.rs
index 1b33adf62..3de25824f 100644
--- a/apps/app/src/api/instance.rs
+++ b/apps/app/src/api/instance.rs
@@ -10,6 +10,8 @@ use theseus::data::{
     EditInstance as CoreEditInstance, InstanceInstallCandidate,
     InstanceInstallTarget, InstanceLaunchOverridesPatch,
     InstanceLink as CoreInstanceLink, InstanceMetadata, LinkedModpackInfo,
+    SharedInstanceAttachment as CoreSharedInstanceAttachment,
+    SharedInstanceRole,
 };
 use theseus::instance::InstallProjectWithDependenciesRequest;
 use theseus::instance::QuickPlayType;
@@ -50,6 +52,15 @@ pub fn init<R: tauri::Runtime>() -> tauri::plugin::TauriPlugin<R> {
             instance_kill,
             instance_edit,
             instance_edit_icon,
+            instance_share_can_current_user_use,
+            instance_share_get_users,
+            instance_share_invite_users,
+            instance_share_create_invite_link,
+            instance_share_remove_users,
+            instance_share_get_publish_preview,
+            instance_share_publish,
+            instance_share_unlink,
+            instance_share_unpublish,
             instance_export_mrpack,
             instance_get_pack_export_candidates,
         ])
@@ -70,6 +81,8 @@ pub struct Instance {
     pub loader_version: Option<String>,
     pub groups: Vec<String>,
     pub link: Option<InstanceLink>,
+    pub shared_instance: Option<SharedInstanceAttachment>,
+    pub quarantined: bool,
     pub update_channel: ReleaseChannel,
     pub created: chrono::DateTime<chrono::Utc>,
     pub modified: chrono::DateTime<chrono::Utc>,
@@ -115,10 +128,40 @@ pub enum InstanceLink {
         active_instance_id: Option<String>,
     },
     SharedInstance {
-        shared_instance_id: String,
+        modpack_project_id: Option<String>,
+        modpack_version_id: Option<String>,
     },
 }
 
+#[derive(Serialize, Debug, Clone)]
+pub struct SharedInstanceAttachment {
+    pub id: String,
+    pub role: SharedInstanceRole,
+    pub manager_id: Option<String>,
+    pub server_manager_name: Option<String>,
+    pub server_manager_icon_url: Option<String>,
+    pub linked_user_id: Option<String>,
+    pub status: String,
+    pub applied_version: Option<i32>,
+    pub latest_version: Option<i32>,
+}
+
+impl From<CoreSharedInstanceAttachment> for SharedInstanceAttachment {
+    fn from(attachment: CoreSharedInstanceAttachment) -> Self {
+        Self {
+            id: attachment.id.to_string(),
+            role: attachment.role,
+            manager_id: attachment.manager_id,
+            server_manager_name: attachment.server_manager_name,
+            server_manager_icon_url: attachment.server_manager_icon_url,
+            linked_user_id: attachment.linked_user_id,
+            status: attachment.status.as_str().to_string(),
+            applied_version: attachment.applied_version,
+            latest_version: attachment.latest_version,
+        }
+    }
+}
+
 #[derive(Serialize, Deserialize, Debug, Clone)]
 pub struct EditInstance {
     pub name: Option<String>,
@@ -201,6 +244,8 @@ impl From<InstanceMetadata> for Instance {
             loader_version: metadata.applied_content_set.loader_version,
             groups: metadata.groups,
             link: InstanceLink::from_core(metadata.link),
+            shared_instance: metadata.shared_instance.map(Into::into),
+            quarantined: metadata.quarantined,
             update_channel: metadata.instance.update_channel,
             created: metadata.instance.created,
             modified: metadata.instance.modified,
@@ -268,11 +313,13 @@ impl InstanceLink {
                     .collect(),
                 active_instance_id: active_instance_id.map(|id| id.to_string()),
             }),
-            CoreInstanceLink::SharedInstance { shared_instance_id } => {
-                Some(Self::SharedInstance {
-                    shared_instance_id: shared_instance_id.to_string(),
-                })
-            }
+            CoreInstanceLink::SharedInstance {
+                modpack_project_id,
+                modpack_version_id,
+            } => Some(Self::SharedInstance {
+                modpack_project_id,
+                modpack_version_id,
+            }),
         }
     }
 
@@ -345,19 +392,13 @@ impl InstanceLink {
                     })
                     .transpose()?,
             }),
-            Self::SharedInstance { shared_instance_id } => {
-                Ok(CoreInstanceLink::SharedInstance {
-                    shared_instance_id: shared_instance_id.parse().map_err(
-                        |err| {
-                            theseus::Error::from(
-                                theseus::ErrorKind::InputError(format!(
-                                    "Invalid shared instance id: {err}"
-                                )),
-                            )
-                        },
-                    )?,
-                })
-            }
+            Self::SharedInstance {
+                modpack_project_id,
+                modpack_version_id,
+            } => Ok(CoreInstanceLink::SharedInstance {
+                modpack_project_id,
+                modpack_version_id,
+            }),
         }
     }
 }
@@ -744,3 +785,90 @@ pub async fn instance_edit_icon(
     theseus::instance::edit_icon(instance_id, icon_path).await?;
     Ok(())
 }
+
+#[tauri::command]
+pub async fn instance_share_can_current_user_use() -> Result<bool> {
+    Ok(theseus::instance::can_active_user_use_shared_instances().await?)
+}
+
+#[tauri::command]
+pub async fn instance_share_get_users(
+    instance_id: &str,
+) -> Result<theseus::instance::SharedInstanceUsers> {
+    Ok(theseus::instance::get_shared_instance_users(instance_id).await?)
+}
+
+#[tauri::command]
+pub async fn instance_share_invite_users(
+    instance_id: &str,
+    user_ids: Vec<String>,
+) -> Result<theseus::instance::SharedInstanceUsers> {
+    Ok(
+        theseus::instance::invite_shared_instance_users(instance_id, user_ids)
+            .await?,
+    )
+}
+
+#[tauri::command]
+pub async fn instance_share_create_invite_link(
+    instance_id: &str,
+    max_age_seconds: Option<i32>,
+    max_uses: Option<i32>,
+    replace_invite_id: Option<String>,
+) -> Result<theseus::instance::SharedInstanceInviteLink> {
+    Ok(theseus::instance::create_shared_instance_invite_link(
+        instance_id,
+        max_age_seconds,
+        max_uses,
+        replace_invite_id,
+    )
+    .await?)
+}
+
+#[tauri::command]
+pub async fn instance_share_remove_users(
+    instance_id: &str,
+    user_ids: Vec<String>,
+    has_pending_recipients: bool,
+) -> Result<theseus::instance::SharedInstanceUsers> {
+    Ok(theseus::instance::remove_shared_instance_users(
+        instance_id,
+        user_ids,
+        has_pending_recipients,
+    )
+    .await?)
+}
+
+#[tauri::command]
+pub async fn instance_share_get_publish_preview(
+    instance_id: &str,
+) -> Result<Option<theseus::instance::SharedInstancePublishPreview>> {
+    Ok(
+        theseus::instance::get_shared_instance_publish_preview(instance_id)
+            .await?,
+    )
+}
+
+#[tauri::command]
+pub async fn instance_share_publish(
+    instance_id: &str,
+    config_paths: Vec<String>,
+) -> Result<SharedInstanceAttachment> {
+    Ok(
+        theseus::instance::publish_shared_instance(instance_id, config_paths)
+            .await?
+            .into(),
+    )
+}
+
+#[tauri::command]
+pub async fn instance_share_unlink(instance_id: &str) -> Result<()> {
+    theseus::instance::unlink_shared_instance(instance_id).await?;
+    Ok(())
+}
+
+#[tauri::command]
+pub async fn instance_share_unpublish(instance_id: &str) -> Result<()> {
+    theseus::instance::unpublish_shared_instance(instance_id).await?;
+    Ok(())
+}
diff --git a/apps/app/src/api/mod.rs b/apps/app/src/api/mod.rs
index 2d45357cb..acbe75b55 100644
--- a/apps/app/src/api/mod.rs
+++ b/apps/app/src/api/mod.rs
@@ -12,9 +12,11 @@ pub mod metadata;
 pub mod minecraft_skins;
 pub mod mr_auth;
 pub mod process;
+pub mod reports;
 pub mod settings;
 pub mod shortcuts;
 pub mod tags;
+pub mod users;
 pub mod utils;
 
 pub mod ads;
@@ -85,9 +87,20 @@ macro_rules! impl_serialize {
                     TheseusSerializableError::Theseus(theseus_error) => {
                         $crate::error::display_tracing_error(theseus_error);
 
-                        let mut state = serializer.serialize_struct("Theseus", 2)?;
+                        let unavailable_reason = match theseus_error.raw.as_ref() {
+                            theseus::ErrorKind::SharedInstanceUnavailable(reason) => Some(reason),
+                            _ => None,
+                        };
+                        let mut state = serializer.serialize_struct(
+                            "Theseus",
+                            if unavailable_reason.is_some() { 4 } else { 2 },
+                        )?;
                         state.serialize_field("field_name", "Theseus")?;
                         state.serialize_field("message", &theseus_error.to_string())?;
+                        if let Some(reason) = unavailable_reason {
+                            state.serialize_field("code", "shared_instance_unavailable")?;
+                            state.serialize_field("reason", reason)?;
+                        }
                         state.end()
                     }
                     $(
diff --git a/apps/app/src/api/mr_auth.rs b/apps/app/src/api/mr_auth.rs
index 2143d20c5..5aba3132a 100644
--- a/apps/app/src/api/mr_auth.rs
+++ b/apps/app/src/api/mr_auth.rs
@@ -22,6 +22,7 @@ pub fn init<R: tauri::Runtime>() -> TauriPlugin<R> {
 #[tauri::command]
 pub async fn modrinth_login<R: Runtime>(
     app: tauri::AppHandle<R>,
+    flow: mr_auth::ModrinthAuthFlow,
 ) -> Result<ModrinthCredentials> {
     let (auth_code_recv_socket_tx, auth_code_recv_socket) = oneshot::channel();
     let auth_code = tokio::spawn(oauth_utils::auth_code_reply::listen(
@@ -32,7 +33,7 @@ pub async fn modrinth_login<R: Runtime>(
 
     let auth_request_uri = format!(
         "{}?launcher=true&ipver={}&port={}",
-        mr_auth::authenticate_begin_flow(),
+        mr_auth::authenticate_begin_flow(flow),
         if auth_code_recv_socket.is_ipv4() {
             "4"
         } else {
diff --git a/apps/app/src/api/reports.rs b/apps/app/src/api/reports.rs
new file mode 100644
index 000000000..3ee5ceb10
--- /dev/null
+++ b/apps/app/src/api/reports.rs
@@ -0,0 +1,15 @@
+use crate::api::Result;
+use theseus::reports::{CreateReportRequest, CreateReportResponse};
+
+pub fn init<R: tauri::Runtime>() -> tauri::plugin::TauriPlugin<R> {
+    tauri::plugin::Builder::new("reports")
+        .invoke_handler(tauri::generate_handler![reports_create])
+        .build()
+}
+
+#[tauri::command]
+pub async fn reports_create(
+    request: CreateReportRequest,
+) -> Result<CreateReportResponse> {
+    Ok(theseus::reports::create_report(request).await?)
+}
diff --git a/apps/app/src/api/users.rs b/apps/app/src/api/users.rs
new file mode 100644
index 000000000..b4c5dba75
--- /dev/null
+++ b/apps/app/src/api/users.rs
@@ -0,0 +1,13 @@
+use crate::api::Result;
+use theseus::users::SearchUser;
+
+#[tauri::command]
+pub async fn search_user(query: &str) -> Result<Vec<SearchUser>> {
+    Ok(theseus::users::search_user(query).await?)
+}
+
+pub fn init<R: tauri::Runtime>() -> tauri::plugin::TauriPlugin<R> {
+    tauri::plugin::Builder::new("users")
+        .invoke_handler(tauri::generate_handler![search_user])
+        .build()
+}
diff --git a/apps/app/src/main.rs b/apps/app/src/main.rs
index 96d6b9e33..2d70869a6 100644
--- a/apps/app/src/main.rs
+++ b/apps/app/src/main.rs
@@ -152,7 +152,7 @@ fn main() {
     builder = builder
         .plugin(tauri_plugin_single_instance::init(|app, args, _cwd| {
             if let Some(payload) = args.get(1) {
-                tracing::info!("Handling deep link from arg {payload}");
+                tracing::info!("Handling command-line deep link");
                 let payload = payload.clone();
                 tauri::async_runtime::spawn(api::utils::handle_command(
                     payload,
@@ -197,7 +197,7 @@ fn main() {
                             .unwrap_or(request);
 
                     tauri::async_runtime::spawn(async move {
-                        tracing::info!("Handling deep link {actual_request}");
+                        tracing::info!("Handling macOS deep link");
 
                         let mut payload = mtx_copy_copy.lock().await;
                         if payload.is_none() {
@@ -213,7 +213,7 @@ fn main() {
             #[cfg(not(target_os = "macos"))]
             app.listen("deep-link://new-url", |url| {
                 let payload = url.payload().to_owned();
-                tracing::info!("Handling deep link {payload}");
+                tracing::info!("Handling deep link");
                 tauri::async_runtime::spawn(api::utils::handle_command(
                     payload,
                 ));
@@ -240,9 +240,11 @@ fn main() {
         .plugin(api::metadata::init())
         .plugin(api::minecraft_skins::init())
         .plugin(api::process::init())
+        .plugin(api::reports::init())
         .plugin(api::settings::init())
         .plugin(api::shortcuts::init())
         .plugin(api::tags::init())
+        .plugin(api::users::init())
         .plugin(api::utils::init())
         .plugin(api::cache::init())
         .plugin(api::files::init())
diff --git a/apps/frontend/.env.local b/apps/frontend/.env.local
index 29aad1d10..c41cb5f51 100644
--- a/apps/frontend/.env.local
+++ b/apps/frontend/.env.local
@@ -1,4 +1,5 @@
 BASE_URL=http://127.0.0.1:8000/v2/
 BROWSER_BASE_URL=http://127.0.0.1:8000/v2/
 PYRO_BASE_URL=https://staging-archon.modrinth.com
+SHARED_INSTANCES_API_BASE_URL=https://staging-shared-instances.modrinth.com
 PROD_OVERRIDE=true
diff --git a/apps/frontend/.env.prod b/apps/frontend/.env.prod
index 8aebc57d5..6c1f4b15c 100644
--- a/apps/frontend/.env.prod
+++ b/apps/frontend/.env.prod
@@ -1,4 +1,5 @@
 BASE_URL=https://api.modrinth.com/v2/
 BROWSER_BASE_URL=https://api.modrinth.com/v2/
 PYRO_BASE_URL=https://archon.modrinth.com
+SHARED_INSTANCES_API_BASE_URL=https://shared-instances.modrinth.com
 PROD_OVERRIDE=true
diff --git a/apps/frontend/.env.staging b/apps/frontend/.env.staging
index 3dd5f73d3..59e9c8700 100644
--- a/apps/frontend/.env.staging
+++ b/apps/frontend/.env.staging
@@ -1,4 +1,5 @@
 BASE_URL=https://staging-api.modrinth.com/v2/
 BROWSER_BASE_URL=https://staging-api.modrinth.com/v2/
 PYRO_BASE_URL=https://staging-archon.modrinth.com
+SHARED_INSTANCES_API_BASE_URL=https://staging-shared-instances.modrinth.com
 PROD_OVERRIDE=true
diff --git a/apps/frontend/.env.staging-archon b/apps/frontend/.env.staging-archon
index 4f733625a..b5f0713f7 100644
--- a/apps/frontend/.env.staging-archon
+++ b/apps/frontend/.env.staging-archon
@@ -1,4 +1,5 @@
 BASE_URL=https://api.modrinth.com/v2/
 BROWSER_BASE_URL=https://api.modrinth.com/v2/
 PYRO_BASE_URL=https://staging-archon.modrinth.com
+SHARED_INSTANCES_API_BASE_URL=https://shared-instances.modrinth.com
 PROD_OVERRIDE=true
diff --git a/apps/frontend/nuxt.config.ts b/apps/frontend/nuxt.config.ts
index 0d14d0c54..7322ac32a 100644
--- a/apps/frontend/nuxt.config.ts
+++ b/apps/frontend/nuxt.config.ts
@@ -7,6 +7,7 @@ import svgLoader from 'vite-svg-loader'
 import { GenericModrinthClient, type Labrinth } from '../../packages/api-client/src/index.ts'
 
 const STAGING_API_URL = 'https://staging-api.modrinth.com/v2/'
+const STAGING_SHARED_INSTANCES_API_URL = 'https://staging-shared-instances.modrinth.com'
 const API_CLIENT_SOURCE = fileURLToPath(
 	new URL('../../packages/api-client/src/index.ts', import.meta.url),
 )
@@ -210,6 +211,7 @@ export default defineNuxtConfig({
 		// @ts-ignore
 		rateLimitKey: process.env.RATE_LIMIT_IGNORE_KEY ?? globalThis.RATE_LIMIT_IGNORE_KEY,
 		pyroBaseUrl: process.env.PYRO_BASE_URL,
+		sharedInstancesBaseUrl: getSharedInstancesApiUrl(),
 		intercomIdentitySecret:
 			process.env.INTERCOM_IDENTITY_SECRET ??
 			// @ts-ignore
@@ -217,6 +219,7 @@ export default defineNuxtConfig({
 		public: {
 			apiBaseUrl: getApiUrl(),
 			pyroBaseUrl: process.env.PYRO_BASE_URL,
+			sharedInstancesBaseUrl: getSharedInstancesApiUrl(),
 			siteUrl: getDomain(),
 			intercomAppId:
 				process.env.INTERCOM_APP_ID ||
@@ -354,6 +357,15 @@ function getApiUrl() {
 	return process.env.BROWSER_BASE_URL ?? globalThis.BROWSER_BASE_URL ?? STAGING_API_URL
 }
 
+function getSharedInstancesApiUrl() {
+	return (
+		process.env.SHARED_INSTANCES_API_BASE_URL ??
+		// @ts-ignore
+		globalThis.SHARED_INSTANCES_API_BASE_URL ??
+		STAGING_SHARED_INSTANCES_API_URL
+	)
+}
+
 function isProduction() {
 	return process.env.NODE_ENV === 'production'
 }
diff --git a/apps/frontend/src/components/ui/SharedInstanceInviteOpenInAppModal.vue b/apps/frontend/src/components/ui/SharedInstanceInviteOpenInAppModal.vue
new file mode 100644
index 000000000..541bb86c2
--- /dev/null
+++ b/apps/frontend/src/components/ui/SharedInstanceInviteOpenInAppModal.vue
@@ -0,0 +1,274 @@
+<template>
+	<div v-if="open" class="fixed inset-0 z-[100] flex items-center justify-center">
+		<div
+			:class="visible ? 'opacity-100' : 'opacity-0'"
+			class="fullscreen-overlay fixed inset-0 cursor-pointer backdrop-blur-xl transition-opacity duration-300 ease-out"
+			@click="hide"
+		/>
+		<div
+			class="relative z-[1] max-h-screen w-full max-w-[28rem] overflow-y-auto px-4 py-10 transition-all duration-300 ease-out"
+			:class="visible ? 'scale-100 opacity-100' : 'scale-95 opacity-0'"
+		>
+			<div class="flex w-full flex-col items-center gap-6">
+				<div class="flex w-full flex-col gap-6">
+					<div
+						v-if="countdown > 0"
+						class="relative mx-auto flex size-[120px] items-center justify-center"
+					>
+						<svg class="absolute size-full -rotate-90" viewBox="0 0 100 100" aria-hidden="true">
+							<circle
+								class="stroke-surface-4"
+								cx="50"
+								cy="50"
+								r="45"
+								fill="none"
+								stroke-width="6"
+							/>
+							<circle
+								class="stroke-brand transition-[stroke-dashoffset] duration-[50ms] ease-linear"
+								cx="50"
+								cy="50"
+								r="45"
+								fill="none"
+								stroke-width="6"
+								:stroke-dasharray="circumference"
+								:stroke-dashoffset="strokeDashoffset"
+								stroke-linecap="round"
+							/>
+						</svg>
+						<span class="z-[1] text-5xl font-bold text-contrast">{{ countdown }}</span>
+					</div>
+
+					<h2 class="m-0 text-center text-3xl font-bold text-contrast">
+						{{ formatMessage(messages.openingApp) }}
+					</h2>
+
+					<div
+						class="flex flex-col items-center gap-4 rounded-3xl border border-solid border-surface-5 bg-surface-3 p-6"
+					>
+						<div class="flex w-full items-center gap-3 rounded-xl bg-surface-2 p-3">
+							<Avatar :src="instance.icon" :alt="instance.name" size="48px" />
+							<div class="flex min-w-0 flex-col gap-1">
+								<span class="truncate font-semibold text-contrast">{{ instance.name }}</span>
+								<span class="flex items-center gap-1.5 text-sm font-medium leading-4 text-primary">
+									<span>{{ formatMessage(messages.managedBy) }}</span>
+									<Avatar
+										:src="instance.inviterAvatar"
+										:alt="instance.inviterName"
+										size="16px"
+										circle
+										no-shadow
+									/>
+									<span>{{ instance.inviterName }}</span>
+								</span>
+							</div>
+						</div>
+						<div class="flex flex-col gap-3 text-left">
+							<span class="font-semibold text-contrast">{{
+								formatMessage(messages.whyUseApp)
+							}}</span>
+
+							<div class="flex flex-col gap-2">
+								<div class="flex items-center gap-2 text-base">
+									<div
+										class="flex size-5 shrink-0 items-center justify-center rounded-full border border-solid border-brand bg-brand-highlight text-brand"
+									>
+										<CheckIcon />
+									</div>
+									<span>{{ formatMessage(messages.benefitJoin) }}</span>
+								</div>
+								<div class="flex items-center gap-2 text-base">
+									<div
+										class="flex size-5 shrink-0 items-center justify-center rounded-full border border-solid border-brand bg-brand-highlight text-brand"
+									>
+										<CheckIcon />
+									</div>
+									<span>{{ formatMessage(messages.benefitInstall) }}</span>
+								</div>
+								<div class="flex items-center gap-2 text-base">
+									<div
+										class="flex size-5 shrink-0 items-center justify-center rounded-full border border-solid border-brand bg-brand-highlight text-brand"
+									>
+										<CheckIcon />
+									</div>
+									<span>{{ formatMessage(messages.benefitUpdate) }}</span>
+								</div>
+							</div>
+						</div>
+					</div>
+				</div>
+
+				<span v-if="countdown > 0" class="text-center text-secondary">{{
+					formatMessage(messages.openingAutomatically)
+				}}</span>
+				<div v-else class="grid w-full grid-cols-1 gap-2 sm:grid-cols-2">
+					<ButtonStyled>
+						<button class="flex-1" type="button" @click="hide">
+							<XIcon />
+							{{ formatMessage(commonMessages.closeButton) }}
+						</button>
+					</ButtonStyled>
+					<ButtonStyled color="brand">
+						<a
+							class="flex-1"
+							href="https://modrinth.com/app"
+							target="_blank"
+							rel="noopener noreferrer"
+						>
+							<DownloadIcon />
+							{{ formatMessage(messages.getApp) }}
+						</a>
+					</ButtonStyled>
+				</div>
+			</div>
+		</div>
+	</div>
+</template>
+
+<script setup lang="ts">
+import { CheckIcon, DownloadIcon, XIcon } from '@modrinth/assets'
+import { Avatar, ButtonStyled, commonMessages, defineMessages, useVIntl } from '@modrinth/ui'
+import { computed, nextTick, onUnmounted, ref } from 'vue'
+
+const { formatMessage } = useVIntl()
+
+const messages = defineMessages({
+	openingApp: {
+		id: 'modal.shared-instance.open-in-app.title',
+		defaultMessage: 'Opening Modrinth App',
+	},
+	managedBy: {
+		id: 'modal.shared-instance.open-in-app.managed-by',
+		defaultMessage: 'Managed by',
+	},
+	whyUseApp: {
+		id: 'modal.shared-instance.open-in-app.why-use',
+		defaultMessage: 'Why use the Modrinth App',
+	},
+	benefitJoin: {
+		id: 'modal.shared-instance.open-in-app.benefit.join',
+		defaultMessage: 'Join the shared instance in one click',
+	},
+	benefitInstall: {
+		id: 'modal.shared-instance.open-in-app.benefit.install',
+		defaultMessage: 'Automatically install the required game and loader',
+	},
+	benefitUpdate: {
+		id: 'modal.shared-instance.open-in-app.benefit.update',
+		defaultMessage: 'Keep shared content updated when the instance changes',
+	},
+	openingAutomatically: {
+		id: 'modal.shared-instance.open-in-app.opening-automatically',
+		defaultMessage: 'The Modrinth App will open automatically...',
+	},
+	getApp: {
+		id: 'modal.shared-instance.open-in-app.get-app',
+		defaultMessage: 'Get Modrinth App',
+	},
+})
+
+export interface SharedInstanceInviteModalData {
+	inviteId: string
+	name: string
+	icon?: string | null
+	inviterName: string
+	inviterAvatar?: string | null
+}
+
+const open = ref(false)
+const visible = ref(false)
+const countdown = ref(3)
+const countdownProgress = ref(1)
+const instance = ref<SharedInstanceInviteModalData>({
+	inviteId: '',
+	name: '',
+	icon: null,
+	inviterName: '',
+	inviterAvatar: null,
+})
+
+let countdownInterval: ReturnType<typeof setInterval> | null = null
+let progressInterval: ReturnType<typeof setInterval> | null = null
+let showTimeout: ReturnType<typeof setTimeout> | null = null
+let hideTimeout: ReturnType<typeof setTimeout> | null = null
+
+const circumference = 2 * Math.PI * 45
+const strokeDashoffset = computed(() => circumference * (1 - countdownProgress.value))
+const appLink = computed(() => `modrinth://share/${encodeURIComponent(instance.value.inviteId)}`)
+
+function startCountdown() {
+	countdown.value = 3
+	countdownProgress.value = 1
+
+	const totalDuration = 3000
+	const progressUpdateInterval = 16
+	const progressDecrement = progressUpdateInterval / totalDuration
+
+	progressInterval = setInterval(() => {
+		countdownProgress.value = Math.max(0, countdownProgress.value - progressDecrement)
+	}, progressUpdateInterval)
+
+	countdownInterval = setInterval(() => {
+		countdown.value--
+		if (countdown.value <= 0) stopCountdown()
+	}, 1000)
+}
+
+function stopCountdown() {
+	if (countdownInterval) {
+		clearInterval(countdownInterval)
+		countdownInterval = null
+	}
+	if (progressInterval) {
+		clearInterval(progressInterval)
+		progressInterval = null
+	}
+}
+
+async function show(options: { instance: SharedInstanceInviteModalData }) {
+	instance.value = options.instance
+	open.value = true
+	document.body.style.overflow = 'hidden'
+	window.addEventListener('keydown', handleKeyDown)
+
+	await nextTick()
+	window.open(appLink.value, '_self')
+
+	showTimeout = setTimeout(() => {
+		visible.value = true
+		startCountdown()
+	}, 50)
+}
+
+function hide() {
+	visible.value = false
+	document.body.style.overflow = ''
+	window.removeEventListener('keydown', handleKeyDown)
+	stopCountdown()
+	if (showTimeout) clearTimeout(showTimeout)
+
+	hideTimeout = setTimeout(() => {
+		open.value = false
+	}, 300)
+}
+
+function handleKeyDown(event: KeyboardEvent) {
+	if (event.key === 'Escape') hide()
+}
+
+onUnmounted(() => {
+	document.body.style.overflow = ''
+	window.removeEventListener('keydown', handleKeyDown)
+	stopCountdown()
+	if (showTimeout) clearTimeout(showTimeout)
+	if (hideTimeout) clearTimeout(hideTimeout)
+})
+
+defineExpose({ show, hide, open })
+</script>
+
+<style scoped>
+.fullscreen-overlay {
+	background: linear-gradient(to bottom, rgb(66 131 92 / 23%) 0%, rgb(17 35 43 / 40%) 97%);
+}
+</style>
diff --git a/apps/frontend/src/components/ui/moderation/ModerationReportCard.vue b/apps/frontend/src/components/ui/moderation/ModerationReportCard.vue
index e2c2b935f..aa10338c3 100644
--- a/apps/frontend/src/components/ui/moderation/ModerationReportCard.vue
+++ b/apps/frontend/src/components/ui/moderation/ModerationReportCard.vue
@@ -89,14 +89,18 @@
 					</div>
 
 					<div v-else class="flex flex-col gap-1.5">
-						<div class="flex items-center gap-2">
+						<div class="flex flex-wrap items-center gap-2">
 							<NuxtLink
+								v-if="report.item_type !== 'shared-instance'"
 								:to="reportItemUrl"
 								target="_blank"
 								class="text-base font-semibold text-contrast hover:underline"
 							>
 								{{ reportItemTitle }}
 							</NuxtLink>
+							<span v-else class="text-base font-semibold text-contrast">
+								{{ reportItemTitle }}
+							</span>
 
 							<div
 								v-if="report.project?.project_type"
@@ -118,6 +122,20 @@
 							>
 								{{ report.version.files.find((f) => f.primary)?.filename || 'Unknown Version' }}
 							</span>
+							<span
+								v-if="report.item_type === 'shared-instance' && report.shared_instance_version_id"
+								class="text-sm text-secondary"
+							>
+								Version {{ report.shared_instance_version_id }}
+							</span>
+							<CopyCode v-if="report.item_type === 'shared-instance'" :text="report.item_id" />
+							<span
+								v-if="report.item_type === 'shared-instance' && sharedInstanceQuarantined"
+								class="bg-orange-highlight inline-flex items-center gap-1 rounded-full border border-solid border-orange px-2.5 py-1 text-sm font-semibold text-orange"
+							>
+								<LockIcon class="size-4" />
+								Quarantined
+							</span>
 						</div>
 
 						<div v-if="report.target" class="flex items-center gap-1">
@@ -135,6 +153,24 @@
 								{{ report.target.name }}
 							</NuxtLink>
 						</div>
+						<div
+							v-else-if="report.item_type === 'shared-instance' && sharedInstanceDetails"
+							class="flex items-center gap-1"
+						>
+							<Avatar
+								:src="sharedInstanceDetails.owner.avatar_url"
+								size="1.5rem"
+								circle
+								class="border border-surface-5 bg-surface-4 !shadow-none"
+							/>
+							<NuxtLink
+								:to="`/user/${sharedInstanceDetails.owner.username}`"
+								target="_blank"
+								class="text-sm font-medium text-secondary hover:underline"
+							>
+								{{ sharedInstanceDetails.owner.username }}
+							</NuxtLink>
+						</div>
 					</div>
 				</div>
 			</div>
@@ -154,6 +190,39 @@
 					:closed="reportClosed"
 					@update-thread="updateThread"
 				>
+					<template #afterMessages>
+						<template v-if="report.item_type === 'shared-instance'">
+							<div
+								v-if="sharedInstanceLoading"
+								class="flex items-center gap-2 border-0 border-t border-solid border-surface-4 px-4 py-6 text-secondary"
+							>
+								<LoaderCircleIcon class="size-5 animate-spin" />
+								Loading shared instance details…
+							</div>
+							<div
+								v-else-if="sharedInstanceError"
+								class="flex flex-col items-start gap-3 border-0 border-t border-solid border-surface-4 px-4 py-6"
+							>
+								<div class="flex flex-col gap-1">
+									<span class="font-semibold text-contrast">
+										Shared instance details could not be loaded
+									</span>
+									<span class="text-sm text-secondary">{{ sharedInstanceError }}</span>
+								</div>
+								<ButtonStyled type="outlined">
+									<button @click="loadSharedInstanceDetails">Try again</button>
+								</ButtonStyled>
+							</div>
+							<SharedInstanceReportContext
+								v-else-if="sharedInstanceDetails"
+								:details="sharedInstanceDetails"
+								:ban-pending="sharedInstanceBanPending"
+								:load-version-content="loadSharedInstanceVersionContent"
+								@ban-owner="banSharedInstanceOwner"
+								@content-error="showSharedInstanceContentError"
+							/>
+						</template>
+					</template>
 					<template #closedActions>
 						<ButtonStyled v-if="isStaff(auth.user)" color="green">
 							<button class="mt-2 w-full gap-2 sm:w-auto" @click="reopenReport()">
@@ -184,29 +253,55 @@
 	</div>
 </template>
 <script setup lang="ts">
-import { CheckCircleIcon, ClipboardCopyIcon, ExternalIcon } from '@modrinth/assets'
+import type { Labrinth, SharedInstances } from '@modrinth/api-client'
+import {
+	CheckCircleIcon,
+	ClipboardCopyIcon,
+	ExternalIcon,
+	LoaderCircleIcon,
+	LockIcon,
+} from '@modrinth/assets'
 import { type ExtendedReport, reportQuickReplies } from '@modrinth/moderation'
 import {
 	Avatar,
 	ButtonStyled,
 	CollapsibleRegion,
+	type ContentItem,
+	CopyCode,
 	getProjectTypeIcon,
+	injectModrinthClient,
 	injectNotificationManager,
 	useFormatDateTime,
 	useRelativeTime,
 } from '@modrinth/ui'
 import { formatProjectType } from '@modrinth/utils'
-import { computed } from 'vue'
+import { computed, ref, watch } from 'vue'
 
 import { isStaff } from '~/helpers/users.js'
 
 import ThreadView from '../thread/ThreadView.vue'
+import SharedInstanceReportContext, {
+	type SharedInstanceOwnerInstance,
+	type SharedInstanceReportDetails,
+	type SharedInstanceReportUser,
+} from './SharedInstanceReportContext.vue'
 
 const { addNotification } = injectNotificationManager()
+const client = injectModrinthClient()
 const auth = await useAuth()
 
+type SharedInstanceVersionDependency = Labrinth.Versions.v2.Dependency & {
+	project_id?: string
+	version_id?: string
+}
+
 const props = defineProps<{
 	report: ExtendedReport
+	sharedInstanceDetailsLoader?: () => Promise<SharedInstanceReportDetails>
+	sharedInstanceVersionContentLoader?: (
+		instanceId: string,
+		version: number,
+	) => Promise<ContentItem[]>
 }>()
 
 const reportThread = ref<{
@@ -214,11 +309,25 @@ const reportThread = ref<{
 	sendReply: (privateMessage?: boolean) => Promise<void>
 } | null>(null)
 const isThreadCollapsed = ref(true)
+const sharedInstanceDetails = ref<SharedInstanceReportDetails | null>(null)
+const sharedInstanceLoading = ref(false)
+const sharedInstanceError = ref<string | null>(null)
+const sharedInstanceBanPending = ref(false)
+const sharedInstanceVersions = new Map<string, SharedInstances.Instances.v1.InstanceVersion>()
+let sharedInstanceDetailsRequest: Promise<void> | null = null
+
+watch(isThreadCollapsed, (collapsed) => {
+	if (!collapsed) void loadSharedInstanceDetails()
+})
 
 const didCloseReport = ref(false)
 const reportClosed = computed(() => {
 	return didCloseReport.value || props.report.closed
 })
+const sharedInstanceQuarantined = computed(
+	() =>
+		sharedInstanceDetails.value?.quarantine ?? props.report.shared_instance?.quarantine ?? false,
+)
 
 const threadWithReportBody = computed(() => {
 	if (!props.report.thread) return null
@@ -322,6 +431,299 @@ function updateThread(newThread: any) {
 	}
 }
 
+async function getSharedInstanceVersion(
+	instanceId: string,
+	versionNumber: number,
+): Promise<SharedInstances.Instances.v1.InstanceVersion> {
+	const cacheKey = `${instanceId}:${versionNumber}`
+	const cachedVersion = sharedInstanceVersions.get(cacheKey)
+	if (cachedVersion) return cachedVersion
+
+	const instanceVersion = await client.sharedinstances.instances_v1.getVersion(
+		instanceId,
+		versionNumber,
+	)
+	sharedInstanceVersions.set(cacheKey, instanceVersion)
+	return instanceVersion
+}
+
+async function getOtherSharedInstances(ownerId: string): Promise<SharedInstanceOwnerInstance[]> {
+	const instanceIds = await client.sharedinstances.instances_v1.getForUser(ownerId)
+	const otherInstanceIds = [...new Set(instanceIds)].filter(
+		(instanceId) => instanceId !== props.report.item_id,
+	)
+	const results = await Promise.allSettled(
+		otherInstanceIds.map(async (instanceId) => {
+			const [instance, instanceUsers, latestVersion] = await Promise.all([
+				client.sharedinstances.instances_v1.get(instanceId),
+				client.sharedinstances.instances_v1.getUsers(instanceId),
+				client.sharedinstances.instances_v1.getLatestVersion(instanceId),
+			])
+			sharedInstanceVersions.set(`${instanceId}:${latestVersion.version}`, latestVersion)
+
+			return {
+				id: instanceId,
+				name: instance.name,
+				icon_url: instance.icon,
+				latest_version: latestVersion.version,
+				member_count: instanceUsers.users.length,
+				quarantine: instance.quarantine,
+			}
+		}),
+	)
+
+	return results
+		.flatMap((result) => (result.status === 'fulfilled' ? [result.value] : []))
+		.sort((a, b) => a.name.localeCompare(b.name))
+}
+
+async function loadSharedInstanceDetails() {
+	if (props.report.item_type !== 'shared-instance' || sharedInstanceDetails.value) return
+	if (sharedInstanceDetailsRequest) return sharedInstanceDetailsRequest
+
+	sharedInstanceDetailsRequest = (async () => {
+		sharedInstanceLoading.value = true
+		sharedInstanceError.value = null
+
+		try {
+			if (props.sharedInstanceDetailsLoader) {
+				sharedInstanceDetails.value = await props.sharedInstanceDetailsLoader()
+				return
+			}
+
+			const [instance, instanceUsers] = await Promise.all([
+				props.report.shared_instance ??
+					client.sharedinstances.instances_v1.get(props.report.item_id),
+				client.sharedinstances.instances_v1.getUsers(props.report.item_id),
+			])
+			const userIds = [...new Set(instanceUsers.users.map((user) => user.id))]
+			const users = userIds.length ? await client.labrinth.users_v2.getMultiple(userIds) : []
+			const usersById = new Map(users.map((user) => [user.id, user]))
+			const ownerMembership = instanceUsers.users.find((user) => user.join_type === 'owner')
+
+			if (!ownerMembership) {
+				throw new Error('The shared instance has no owner.')
+			}
+
+			const toReportUser = (
+				membership: (typeof instanceUsers.users)[number],
+			): SharedInstanceReportUser => {
+				const user = usersById.get(membership.id)
+				return {
+					id: membership.id,
+					username: user?.username ?? membership.id,
+					avatar_url: user?.avatar_url,
+					joined_at: membership.joined_at,
+					last_played: membership.last_played,
+					join_type: membership.join_type,
+				}
+			}
+
+			const reportedVersion = props.report.shared_instance_version_id
+			const versionNumbers = reportedVersion
+				? Array.from({ length: reportedVersion }, (_, index) => reportedVersion - index)
+				: []
+			const [versionDetails, otherInstancesResult] = await Promise.all([
+				Promise.all(
+					versionNumbers.map(async (versionNumber) => {
+						try {
+							const version = await getSharedInstanceVersion(props.report.item_id, versionNumber)
+							return {
+								version: version.version,
+								game_version: version.game_version,
+								loader: version.loader,
+								loader_version: version.loader_version,
+							}
+						} catch {
+							return { version: versionNumber }
+						}
+					}),
+				),
+				getOtherSharedInstances(ownerMembership.id)
+					.then((instances) => ({ instances, loaded: true }))
+					.catch(() => ({ instances: [], loaded: false })),
+			])
+
+			sharedInstanceDetails.value = {
+				id: props.report.item_id,
+				name: instance.name,
+				icon_url: instance.icon,
+				quarantine: instance.quarantine,
+				owner: toReportUser(ownerMembership),
+				members: instanceUsers.users
+					.filter((user) => user.id !== ownerMembership.id)
+					.map(toReportUser),
+				reported_version: versionDetails[0],
+				previous_versions: versionDetails.slice(1),
+				other_instances: otherInstancesResult.instances,
+				other_instances_loaded: otherInstancesResult.loaded,
+			}
+		} catch (error) {
+			sharedInstanceError.value = getErrorMessage(error, 'Failed to load shared instance details.')
+		} finally {
+			sharedInstanceLoading.value = false
+			sharedInstanceDetailsRequest = null
+		}
+	})()
+
+	return sharedInstanceDetailsRequest
+}
+
+async function loadSharedInstanceVersionContent(
+	instanceId: string,
+	versionNumber: number,
+): Promise<ContentItem[]> {
+	if (props.report.item_type !== 'shared-instance') return []
+	if (props.sharedInstanceVersionContentLoader) {
+		return props.sharedInstanceVersionContentLoader(instanceId, versionNumber)
+	}
+
+	const instanceVersion = await getSharedInstanceVersion(instanceId, versionNumber)
+
+	const modpackVersionId = instanceVersion.modpack_id
+	const directVersionIds = (instanceVersion.modrinth_ids ?? []).filter(
+		(versionId) => versionId !== modpackVersionId,
+	)
+	const modpackVersion = modpackVersionId
+		? await client.labrinth.versions_v2.getVersion(modpackVersionId)
+		: null
+	const modpackDependencies = (modpackVersion?.dependencies ??
+		[]) as SharedInstanceVersionDependency[]
+	const dependencyVersionIds = modpackDependencies.flatMap((dependency) =>
+		dependency.version_id ? [dependency.version_id] : [],
+	)
+	const uniqueVersionIds = [...new Set([...directVersionIds, ...dependencyVersionIds])]
+	const versions = uniqueVersionIds.length
+		? await client.labrinth.versions_v2.getVersions(uniqueVersionIds)
+		: []
+	const dependencyProjectIds = modpackDependencies.flatMap((dependency) =>
+		dependency.project_id ? [dependency.project_id] : [],
+	)
+	const projectIds = [
+		...new Set([...versions.map((version) => version.project_id), ...dependencyProjectIds]),
+	]
+	const projects = projectIds.length
+		? await client.labrinth.projects_v2.getMultiple(projectIds)
+		: []
+	const versionsById = new Map(versions.map((version) => [version.id, version]))
+	const projectsById = new Map(projects.map((project) => [project.id, project]))
+
+	const directContent: ContentItem[] = [...new Set(directVersionIds)].flatMap((versionId) => {
+		const version = versionsById.get(versionId)
+		if (!version) return []
+
+		const project = projectsById.get(version.project_id)
+		return [sharedInstanceContentItem(version, project)]
+	})
+
+	const modpackContent: ContentItem[] = modpackDependencies.map((dependency) => {
+		const version = dependency.version_id ? versionsById.get(dependency.version_id) : undefined
+		const project = dependency.project_id
+			? projectsById.get(dependency.project_id)
+			: version
+				? projectsById.get(version.project_id)
+				: undefined
+		const primaryFile = version
+			? (version.files.find((file) => file.primary) ?? version.files[0])
+			: undefined
+		const fileName =
+			primaryFile?.filename ?? dependency.file_name ?? project?.title ?? version?.name ?? 'Unknown'
+
+		return sharedInstanceContentItem(
+			version,
+			project,
+			fileName,
+			dependency.project_id ?? fileName,
+			!project && !version,
+		)
+	})
+
+	const externalContent: ContentItem[] = instanceVersion.external_files.map((file, index) => ({
+		id: `external:${file.file_type}:${file.file_name}:${index}`,
+		file_name: file.file_name,
+		size: file.file_size,
+		project_type: file.file_type,
+		has_update: false,
+		update_version_id: null,
+		source_kind: 'shared_instance',
+		external: true,
+		external_url: file.url,
+		project: {
+			id: file.file_name,
+			slug: file.file_name,
+			title: file.file_name,
+			icon_url: undefined,
+		},
+	}))
+
+	return [...externalContent, ...modpackContent, ...directContent]
+}
+
+function sharedInstanceContentItem(
+	version: Labrinth.Versions.v2.Version | undefined,
+	project: Labrinth.Projects.v2.Project | undefined,
+	fallbackFileName?: string,
+	fallbackProjectId = version?.project_id ?? fallbackFileName ?? 'unknown',
+	external = false,
+): ContentItem {
+	const primaryFile = version
+		? (version.files.find((file) => file.primary) ?? version.files[0])
+		: undefined
+	const fileName =
+		primaryFile?.filename ?? fallbackFileName ?? project?.title ?? version?.name ?? 'Unknown'
+
+	return {
+		id: version?.id ?? project?.id ?? fileName,
+		file_name: fileName,
+		size: primaryFile?.size,
+		project_type: project?.project_type ?? 'mod',
+		has_update: false,
+		update_version_id: null,
+		source_kind: 'shared_instance',
+		external,
+		project: {
+			id: project?.id ?? fallbackProjectId,
+			slug: project?.slug ?? fallbackProjectId,
+			title: project?.title ?? version?.name ?? fileName,
+			icon_url: project?.icon_url ?? undefined,
+		},
+		...(version
+			? {
+					version: {
+						id: version.id,
+						version_number: version.version_number,
+						file_name: fileName,
+						date_published: version.date_published,
+					},
+				}
+			: {}),
+	}
+}
+
+function showSharedInstanceContentError(error: unknown) {
+	addNotification({
+		type: 'error',
+		title: 'Failed to load version content',
+		text: getErrorMessage(
+			error,
+			'The content for this shared instance version could not be loaded.',
+		),
+	})
+}
+
+function getErrorMessage(error: unknown, fallback: string) {
+	if (typeof error === 'string') return error
+	if (!error || typeof error !== 'object') return fallback
+
+	const requestError = error as {
+		message?: string
+		data?: {
+			description?: string
+		}
+	}
+	return requestError.data?.description ?? requestError.message ?? fallback
+}
+
 const reportItemAvatarUrl = computed(() => {
 	switch (props.report.item_type) {
 		case 'project':
@@ -329,6 +731,8 @@ const reportItemAvatarUrl = computed(() => {
 			return props.report.project?.icon_url || ''
 		case 'user':
 			return props.report.user?.avatar_url || ''
+		case 'shared-instance':
+			return sharedInstanceDetails.value?.icon_url || props.report.shared_instance?.icon || ''
 		default:
 			return undefined
 	}
@@ -336,6 +740,11 @@ const reportItemAvatarUrl = computed(() => {
 
 const reportItemTitle = computed(() => {
 	if (props.report.item_type === 'user') return props.report.user?.username || 'Unknown User'
+	if (props.report.item_type === 'shared-instance') {
+		return (
+			sharedInstanceDetails.value?.name || props.report.shared_instance?.name || 'Shared instance'
+		)
+	}
 
 	return props.report.project?.title || 'Unknown Project'
 })
@@ -348,6 +757,8 @@ const reportItemUrl = computed(() => {
 			return `/${props.report.project?.project_type}/${props.report.project?.slug}`
 		case 'version':
 			return `/${props.report.project?.project_type}/${props.report.project?.slug}/version/${props.report.version?.id}`
+		case 'shared-instance':
+			return ''
 		default:
 			return `/${props.report.item_type}/${props.report.id}`
 	}
@@ -370,4 +781,40 @@ function copyId() {
 		})
 	})
 }
+
+async function banSharedInstanceOwner(owner: SharedInstanceReportUser) {
+	if (sharedInstanceBanPending.value) return
+	sharedInstanceBanPending.value = true
+
+	try {
+		await client.sharedinstances.moderation_v1.blacklistUsers({
+			user_ids: [owner.id],
+		})
+
+		if (sharedInstanceDetails.value) {
+			sharedInstanceDetails.value = {
+				...sharedInstanceDetails.value,
+				quarantine: true,
+				other_instances: sharedInstanceDetails.value.other_instances.map((instance) => ({
+					...instance,
+					quarantine: true,
+				})),
+			}
+		}
+
+		addNotification({
+			type: 'success',
+			title: 'Owner banned from shared instances',
+			text: `${owner.username} has been banned and all of their shared instances have been quarantined.`,
+		})
+	} catch (error) {
+		addNotification({
+			type: 'error',
+			title: 'Failed to ban shared instance owner',
+			text: getErrorMessage(error, `Could not ban ${owner.username} from shared instances.`),
+		})
+	} finally {
+		sharedInstanceBanPending.value = false
+	}
+}
 </script>
diff --git a/apps/frontend/src/components/ui/moderation/SharedInstanceReportContext.vue b/apps/frontend/src/components/ui/moderation/SharedInstanceReportContext.vue
new file mode 100644
index 000000000..3f3b0d9ad
--- /dev/null
+++ b/apps/frontend/src/components/ui/moderation/SharedInstanceReportContext.vue
@@ -0,0 +1,442 @@
+<script setup lang="ts">
+import {
+	BanIcon,
+	BoxesIcon,
+	BoxIcon,
+	EyeIcon,
+	HistoryIcon,
+	LinkIcon,
+	LockIcon,
+	UserPlusIcon,
+	UsersIcon,
+	VersionIcon,
+} from '@modrinth/assets'
+import {
+	Avatar,
+	ButtonStyled,
+	ConfirmLeaveModal,
+	type ContentItem,
+	injectModrinthClient,
+	ModpackContentModal,
+	Table,
+	type TableColumn,
+	useFormatDateTime,
+	useRelativeTime,
+} from '@modrinth/ui'
+import { useQuery } from '@tanstack/vue-query'
+import { computed, ref } from 'vue'
+
+export interface SharedInstanceReportUser {
+	id: string
+	username: string
+	avatar_url?: string | null
+	joined_at?: string | null
+	last_played?: string | null
+	join_type?: 'owner' | 'invite' | 'link'
+}
+
+export interface SharedInstanceReportVersion {
+	version: number
+	game_version?: string
+	loader?: string
+	loader_version?: string
+	created?: string
+}
+
+export interface SharedInstanceOwnerInstance {
+	id: string
+	name: string
+	icon_url?: string | null
+	latest_version: number
+	member_count: number
+	quarantine: boolean
+}
+
+export interface SharedInstanceReportDetails {
+	id: string
+	name: string
+	icon_url?: string | null
+	quarantine: boolean
+	owner: SharedInstanceReportUser
+	members: SharedInstanceReportUser[]
+	reported_version?: SharedInstanceReportVersion
+	previous_versions: SharedInstanceReportVersion[]
+	other_instances: SharedInstanceOwnerInstance[]
+	other_instances_loaded?: boolean
+}
+
+const props = defineProps<{
+	details: SharedInstanceReportDetails
+	banPending?: boolean
+	loadVersionContent?: (instanceId: string, version: number) => Promise<ContentItem[]>
+}>()
+
+const emit = defineEmits<{
+	banOwner: [owner: SharedInstanceReportUser]
+	contentError: [error: unknown]
+}>()
+
+const contentModal = ref<InstanceType<typeof ModpackContentModal> | null>(null)
+const banModal = ref<InstanceType<typeof ConfirmLeaveModal> | null>(null)
+const client = injectModrinthClient()
+const contentByVersion = new Map<string, ContentItem[]>()
+const contentInstance = ref<Pick<SharedInstanceOwnerInstance, 'id' | 'name' | 'icon_url'>>({
+	id: props.details.id,
+	name: props.details.name,
+	icon_url: props.details.icon_url,
+})
+const formatRelativeTime = useRelativeTime({ style: 'narrow' })
+const formatDateTime = useFormatDateTime({ dateStyle: 'medium', timeStyle: 'short' })
+
+type MemberTableColumn = 'username' | 'lastPlayed' | 'joined' | 'method'
+type MemberTableRow = {
+	id: string
+	username: string
+	avatarUrl?: string | null
+	lastPlayed: string | null
+	joined: string | null
+	method: 'owner' | 'invite' | 'link'
+}
+
+const memberColumns: TableColumn<MemberTableColumn>[] = [
+	{
+		key: 'username',
+		label: 'Username',
+		width: 'clamp(14rem, 30%, 26rem)',
+	},
+	{
+		key: 'lastPlayed',
+		label: 'Last played',
+		width: 'clamp(7rem, 15%, 13rem)',
+		headerClass: 'whitespace-nowrap !px-2',
+		cellClass: 'whitespace-nowrap !px-2',
+	},
+	{
+		key: 'joined',
+		label: 'Joined',
+		width: 'clamp(7rem, 14%, 12rem)',
+		headerClass: 'whitespace-nowrap !px-2',
+		cellClass: 'whitespace-nowrap !px-2',
+	},
+	{
+		key: 'method',
+		label: 'Method',
+		headerClass: 'whitespace-nowrap !px-2',
+		cellClass: 'whitespace-nowrap !px-2',
+	},
+]
+
+const allVersions = computed(() => [
+	...(props.details.reported_version ? [props.details.reported_version] : []),
+	...props.details.previous_versions,
+])
+const { data: ownerBlacklistStatus, isFetching: ownerBlacklistStatusFetching } = useQuery({
+	queryKey: computed(() => ['shared-instance-blacklist', 'v1', props.details.owner.id]),
+	queryFn: () => client.sharedinstances.users_v1.getBlacklistStatus(props.details.owner.id),
+	retry: false,
+})
+const banDisabled = computed(
+	() =>
+		!!props.banPending ||
+		props.details.quarantine ||
+		ownerBlacklistStatusFetching.value ||
+		ownerBlacklistStatus.value?.blacklisted === true,
+)
+const banButtonLabel = computed(() => {
+	if (props.banPending) return 'Banning owner…'
+	if (ownerBlacklistStatus.value?.blacklisted) return 'Owner already banned'
+	if (props.details.quarantine) return 'Instance already quarantined'
+	return 'Ban from shared instances'
+})
+const memberRows = computed<MemberTableRow[]>(() =>
+	[props.details.owner, ...props.details.members.filter((user) => user.joined_at != null)].map(
+		(user) => ({
+			id: user.id,
+			username: user.username,
+			avatarUrl: user.avatar_url,
+			lastPlayed: user.last_played ?? null,
+			joined: user.joined_at ?? null,
+			method: user.join_type ?? 'invite',
+		}),
+	),
+)
+
+async function promptBanOwner() {
+	if (banDisabled.value || !(await banModal.value?.prompt())) return
+	emit('banOwner', props.details.owner)
+}
+
+async function viewVersionContent(
+	instance: Pick<SharedInstanceOwnerInstance, 'id' | 'name' | 'icon_url'>,
+	version: number,
+) {
+	contentInstance.value = instance
+	contentModal.value?.showLoading()
+
+	try {
+		const cacheKey = `${instance.id}:${version}`
+		let content = contentByVersion.get(cacheKey)
+		if (!content) {
+			content = props.loadVersionContent ? await props.loadVersionContent(instance.id, version) : []
+			contentByVersion.set(cacheKey, content)
+		}
+		contentModal.value?.setItems(content)
+	} catch (error) {
+		contentModal.value?.hide()
+		emit('contentError', error)
+	}
+}
+
+function viewReportedInstanceVersion(version: SharedInstanceReportVersion) {
+	return viewVersionContent(
+		{
+			id: props.details.id,
+			name: props.details.name,
+			icon_url: props.details.icon_url,
+		},
+		version.version,
+	)
+}
+
+function formattedLoader(version: SharedInstanceReportVersion) {
+	const loader = version.loader
+		? version.loader.charAt(0).toUpperCase() + version.loader.slice(1)
+		: 'Vanilla'
+	return version.loader_version ? `${loader} ${version.loader_version}` : loader
+}
+</script>
+
+<template>
+	<section
+		class="shared-instance-message relative grid items-center gap-x-[var(--spacing-card-sm)] gap-y-[var(--spacing-card-xs)] break-words border-0 border-t border-solid border-surface-4 px-4 py-3"
+	>
+		<div
+			class="shared-instance-message__icon backed-svg circle raised mb-auto border border-solid border-surface-5 shadow-[var(--shadow-card)]"
+			style="--size: 2rem"
+		>
+			<BoxesIcon />
+		</div>
+		<div
+			class="shared-instance-message__author flex shrink-0 flex-wrap items-center gap-[var(--spacing-card-xs)] font-bold text-[var(--color-text)]"
+		>
+			<span>Shared instance details</span>
+			<span
+				class="border-blue/60 rounded-full border border-solid bg-highlight-blue px-2 py-0.5 text-xs font-semibold text-blue"
+			>
+				Report context
+			</span>
+		</div>
+
+		<div
+			class="shared-instance-message__body overflow-hidden rounded-2xl border border-solid border-surface-4 bg-surface-3"
+		>
+			<div class="flex flex-col gap-3 p-4">
+				<div class="flex items-center gap-2 font-semibold text-contrast">
+					<UsersIcon class="size-5 text-secondary" />
+					Owner and members
+				</div>
+
+				<Table :columns="memberColumns" :data="memberRows" row-key="id" table-min-width="42rem">
+					<template #cell-username="{ row }">
+						<NuxtLink
+							:to="`/user/${row.username}`"
+							target="_blank"
+							class="inline-flex min-w-0 max-w-full items-center gap-2 text-primary hover:underline"
+						>
+							<Avatar
+								:src="row.avatarUrl"
+								:alt="`${row.username}'s avatar`"
+								:tint-by="row.id"
+								size="24px"
+								circle
+								no-shadow
+							/>
+							<span class="min-w-0 truncate font-medium">{{ row.username }}</span>
+						</NuxtLink>
+					</template>
+					<template #cell-lastPlayed="{ row }">
+						<span v-if="row.lastPlayed" v-tooltip="formatDateTime(row.lastPlayed)">
+							{{ formatRelativeTime(row.lastPlayed) }}
+						</span>
+						<span v-else>Never</span>
+					</template>
+					<template #cell-joined="{ row }">
+						<span v-if="row.joined" v-tooltip="formatDateTime(row.joined)">
+							{{ formatRelativeTime(row.joined) }}
+						</span>
+						<span v-else>Unknown</span>
+					</template>
+					<template #cell-method="{ row }">
+						<span class="inline-flex min-w-0 items-center gap-2">
+							<UsersIcon v-if="row.method === 'owner'" class="size-5 shrink-0" aria-hidden="true" />
+							<LinkIcon
+								v-else-if="row.method === 'link'"
+								class="size-5 shrink-0"
+								aria-hidden="true"
+							/>
+							<UserPlusIcon v-else class="size-5 shrink-0" aria-hidden="true" />
+							<span class="min-w-0 truncate">
+								{{
+									row.method === 'owner'
+										? 'Owner'
+										: row.method === 'link'
+											? 'Share link'
+											: 'Direct invite'
+								}}
+							</span>
+						</span>
+					</template>
+				</Table>
+			</div>
+
+			<div class="border-0 border-t border-solid border-surface-4 p-4">
+				<div class="flex flex-col gap-3">
+					<div class="flex items-center gap-2 font-semibold text-contrast">
+						<HistoryIcon class="size-5 text-secondary" />
+						Version history
+					</div>
+
+					<div v-if="allVersions.length" class="grid max-h-64 gap-2 overflow-y-auto lg:grid-cols-2">
+						<div
+							v-for="version in allVersions"
+							:key="version.version"
+							class="flex flex-col gap-2 rounded-xl bg-surface-2 p-3 sm:flex-row sm:items-center sm:justify-between"
+						>
+							<div class="flex min-w-0 items-center gap-2.5">
+								<div class="backed-svg shrink-0">
+									<VersionIcon />
+								</div>
+								<div class="flex min-w-0 flex-col">
+									<div class="flex flex-wrap items-center gap-2">
+										<span class="font-semibold text-contrast">Version {{ version.version }}</span>
+										<span
+											v-if="version.version === details.reported_version?.version"
+											class="bg-orange-highlight rounded-full px-2 py-0.5 text-xs font-semibold text-orange"
+										>
+											Reported
+										</span>
+									</div>
+									<span v-if="version.game_version" class="truncate text-sm text-secondary">
+										Minecraft {{ version.game_version }} · {{ formattedLoader(version) }}
+									</span>
+								</div>
+							</div>
+
+							<ButtonStyled type="outlined">
+								<button class="w-full sm:w-auto" @click="viewReportedInstanceVersion(version)">
+									<EyeIcon class="size-4" />
+									View content
+								</button>
+							</ButtonStyled>
+						</div>
+					</div>
+					<span v-else class="text-sm text-secondary">
+						No version was attached to this report.
+					</span>
+				</div>
+			</div>
+
+			<div class="flex flex-col gap-3 border-0 border-t border-solid border-surface-4 p-4">
+				<div class="flex items-center gap-2 font-semibold text-contrast">
+					<BoxIcon class="size-5 text-secondary" />
+					Other instances owned by {{ details.owner.username }}
+				</div>
+
+				<div v-if="details.other_instances.length" class="grid gap-2 sm:grid-cols-2 xl:grid-cols-3">
+					<div
+						v-for="instance in details.other_instances"
+						:key="instance.id"
+						class="flex min-w-0 items-center gap-2 rounded-xl bg-surface-2 p-3"
+					>
+						<Avatar :src="instance.icon_url" :tint-by="instance.id" size="2.5rem" no-shadow />
+						<div class="flex min-w-0 flex-1 flex-col">
+							<div class="flex min-w-0 items-center gap-1.5">
+								<span class="truncate font-semibold text-contrast">{{ instance.name }}</span>
+								<LockIcon
+									v-if="instance.quarantine"
+									v-tooltip="'Quarantined'"
+									class="size-4 shrink-0 text-orange"
+								/>
+							</div>
+							<span class="text-sm text-secondary">
+								Version {{ instance.latest_version }} · {{ instance.member_count }}
+								{{ instance.member_count === 1 ? 'member' : 'members' }}
+							</span>
+						</div>
+						<ButtonStyled circular type="transparent">
+							<button
+								v-tooltip="`View ${instance.name} version ${instance.latest_version} content`"
+								:aria-label="`View ${instance.name} version ${instance.latest_version} content`"
+								@click="viewVersionContent(instance, instance.latest_version)"
+							>
+								<EyeIcon class="size-4" />
+							</button>
+						</ButtonStyled>
+					</div>
+				</div>
+				<span v-else-if="details.other_instances_loaded" class="text-sm text-secondary">
+					This owner has no other shared instances.
+				</span>
+				<span v-else class="text-sm text-secondary">
+					Other instances are unavailable from the current shared instances API.
+				</span>
+			</div>
+
+			<footer
+				class="flex flex-col gap-3 border-0 border-t border-solid border-surface-4 bg-surface-2 p-4 sm:flex-row sm:items-center sm:justify-between"
+			>
+				<div class="flex max-w-2xl flex-col gap-0.5">
+					<span class="font-semibold text-contrast">Shared instances service ban</span>
+					<span class="text-sm text-secondary">
+						Banning this owner quarantines all of their shared instances and prevents members from
+						launching them.
+					</span>
+				</div>
+				<ButtonStyled color="red">
+					<button :disabled="banDisabled" class="w-full gap-2 sm:w-auto" @click="promptBanOwner">
+						<BanIcon class="size-4" />
+						{{ banButtonLabel }}
+					</button>
+				</ButtonStyled>
+			</footer>
+		</div>
+
+		<ModpackContentModal
+			ref="contentModal"
+			header="Shared instance content"
+			:modpack-name="contentInstance.name"
+			:modpack-icon-url="contentInstance.icon_url ?? undefined"
+		/>
+		<ConfirmLeaveModal
+			ref="banModal"
+			title="Ban from shared instances?"
+			:header="`Ban ${details.owner.username} from shared instances`"
+			body="This permanently prevents the owner from creating or managing shared instances. All of their shared instances will be quarantined, and members will be unable to launch them."
+			stay-label="Cancel"
+			leave-label="Ban owner"
+			admonition-type="critical"
+		/>
+	</section>
+</template>
+
+<style scoped>
+.shared-instance-message {
+	grid-template:
+		'icon author'
+		'icon body';
+	grid-template-columns: min-content minmax(0, 1fr);
+	grid-template-rows: min-content 1fr;
+}
+
+.shared-instance-message__icon {
+	grid-area: icon;
+}
+
+.shared-instance-message__author {
+	grid-area: author;
+}
+
+.shared-instance-message__body {
+	grid-area: body;
+}
+</style>
diff --git a/apps/frontend/src/components/ui/report/ReportInfo.vue b/apps/frontend/src/components/ui/report/ReportInfo.vue
index 3c4c619eb..3f584a0d5 100644
--- a/apps/frontend/src/components/ui/report/ReportInfo.vue
+++ b/apps/frontend/src/components/ui/report/ReportInfo.vue
@@ -63,6 +63,18 @@
 				</nuxt-link>
 			</template>
 		</div>
+		<div v-else-if="report.item_type === 'shared-instance'" class="item-info">
+			<div class="backed-svg" :class="{ raised: raised }">
+				<BoxesIcon />
+			</div>
+			<div class="stacked">
+				<span class="title">Shared instance</span>
+				<span>
+					Version {{ report.shared_instance_version_id ?? 'unknown' }} ·
+					<CopyCode :text="report.item_id" />
+				</span>
+			</div>
+		</div>
 		<div v-else class="item-info">
 			<div class="backed-svg" :class="{ raised: raised }">
 				<UnknownIcon />
@@ -106,7 +118,7 @@
 </template>
 
 <script setup>
-import { ReportIcon, UnknownIcon, VersionIcon } from '@modrinth/assets'
+import { BoxesIcon, ReportIcon, UnknownIcon, VersionIcon } from '@modrinth/assets'
 import { Avatar, Badge, CopyCode, useFormatDateTime, useRelativeTime } from '@modrinth/ui'
 import { formatProjectType, renderHighlightedString } from '@modrinth/utils'
 
diff --git a/apps/frontend/src/components/ui/thread/ThreadView.vue b/apps/frontend/src/components/ui/thread/ThreadView.vue
index 0e487bc68..11ee3dc6c 100644
--- a/apps/frontend/src/components/ui/thread/ThreadView.vue
+++ b/apps/frontend/src/components/ui/thread/ThreadView.vue
@@ -16,6 +16,7 @@
 				raised
 				@update-thread="() => updateThreadLocal()"
 			/>
+			<slot name="afterMessages" />
 		</div>
 		<div v-else class="flex flex-col items-center justify-center space-y-3 py-12">
 			<MessageIcon class="size-12 text-secondary" />
diff --git a/apps/frontend/src/error.vue b/apps/frontend/src/error.vue
index 5745c03ac..e164cd589 100644
--- a/apps/frontend/src/error.vue
+++ b/apps/frontend/src/error.vue
@@ -123,6 +123,7 @@ setupLoadingStateProvider()
 const client = createModrinthClient(auth.value, {
 	apiBaseUrl: config.public.apiBaseUrl.replace('/v2/', '/'),
 	archonBaseUrl: config.public.pyroBaseUrl.replace('/v2/', '/'),
+	sharedInstancesBaseUrl: config.public.sharedInstancesBaseUrl,
 	rateLimitKey: config.rateLimitKey,
 })
 provideModrinthClient(client)
diff --git a/apps/frontend/src/helpers/api.ts b/apps/frontend/src/helpers/api.ts
index 5dd1ed0a8..fba738526 100644
--- a/apps/frontend/src/helpers/api.ts
+++ b/apps/frontend/src/helpers/api.ts
@@ -29,7 +29,12 @@ async function getRateLimitKeyFromSecretsStore(): Promise<string | undefined> {
 
 export function createModrinthClient(
 	auth: Ref<{ token: string | undefined }>,
-	config: { apiBaseUrl: string; archonBaseUrl: string; rateLimitKey?: string },
+	config: {
+		apiBaseUrl: string
+		archonBaseUrl: string
+		sharedInstancesBaseUrl: string
+		rateLimitKey?: string
+	},
 ): NuxtModrinthClient {
 	const flags = useFeatureFlags()
 	const optionalFeatures = [
@@ -40,6 +45,7 @@ export function createModrinthClient(
 		labrinthBaseUrl: config.apiBaseUrl,
 		archonBaseUrl: () =>
 			withStagingArchonBaseUrl(config.archonBaseUrl, flags.value.archonApiStaging),
+		sharedInstancesBaseUrl: config.sharedInstancesBaseUrl,
 		archonSentryCapture: () => flags.value.archonSentryCapture,
 		rateLimitKey: config.rateLimitKey || getRateLimitKeyFromSecretsStore,
 		features: [
diff --git a/apps/frontend/src/helpers/moderation.ts b/apps/frontend/src/helpers/moderation.ts
index 65b94e7da..e511e1758 100644
--- a/apps/frontend/src/helpers/moderation.ts
+++ b/apps/frontend/src/helpers/moderation.ts
@@ -1,14 +1,6 @@
-import type { Labrinth } from '@modrinth/api-client'
+import type { AbstractModrinthClient, Labrinth, SharedInstances } from '@modrinth/api-client'
 import type { ExtendedReport, OwnershipTarget } from '@modrinth/moderation'
-import type {
-	Organization,
-	Project,
-	Report,
-	TeamMember,
-	Thread,
-	User,
-	Version,
-} from '@modrinth/utils'
+import type { Organization, Project, TeamMember, Thread, User, Version } from '@modrinth/utils'
 
 export const useModerationCache = () => ({
 	threads: useState<Map<string, Thread>>('moderation-report-cache-threads', () => new Map()),
@@ -17,10 +9,17 @@ export const useModerationCache = () => ({
 	versions: useState<Map<string, Version>>('moderation-report-cache-versions', () => new Map()),
 	teams: useState<Map<string, TeamMember[]>>('moderation-report-cache-teams', () => new Map()),
 	orgs: useState<Map<string, Organization>>('moderation-report-cache-orgs', () => new Map()),
+	sharedInstances: useState<Map<string, SharedInstances.Instances.v1.Instance>>(
+		'moderation-report-cache-shared-instances',
+		() => new Map(),
+	),
 })
 
 // TODO: @AlexTMjugador - backend should do all of these functions.
-export async function enrichReportBatch(reports: Report[]): Promise<ExtendedReport[]> {
+export async function enrichReportBatch(
+	reports: Labrinth.Reports.v3.Report[],
+	client: AbstractModrinthClient,
+): Promise<ExtendedReport[]> {
 	if (reports.length === 0) return []
 
 	const cache = useModerationCache()
@@ -41,8 +40,16 @@ export async function enrichReportBatch(reports: Report[]): Promise<ExtendedRepo
 		.filter((r) => r.item_type === 'project')
 		.map((r) => r.item_id)
 		.filter((id) => !cache.projects.value.has(id))
+	const sharedInstanceIDs = [
+		...new Set(
+			reports
+				.filter((r) => r.item_type === 'shared-instance')
+				.map((r) => r.item_id)
+				.filter((id) => !cache.sharedInstances.value.has(id)),
+		),
+	]
 
-	const [newThreads, newVersions, newUsers] = await Promise.all([
+	const [newThreads, newVersions, newUsers, newSharedInstances] = await Promise.all([
 		threadIDs.length > 0
 			? (fetchSegmented(threadIDs, (ids) => `threads?ids=${asEncodedJsonArray(ids)}`) as Promise<
 					Thread[]
@@ -59,11 +66,22 @@ export async function enrichReportBatch(reports: Report[]): Promise<ExtendedRepo
 					(ids) => `users?ids=${asEncodedJsonArray(ids)}`,
 				) as Promise<User[]>)
 			: Promise.resolve([]),
+		Promise.allSettled(
+			sharedInstanceIDs.map(async (instanceId) => ({
+				id: instanceId,
+				instance: await client.sharedinstances.instances_v1.get(instanceId),
+			})),
+		),
 	])
 
 	newThreads.forEach((t) => cache.threads.value.set(t.id, t))
 	newVersions.forEach((v) => cache.versions.value.set(v.id, v))
 	newUsers.forEach((u) => cache.users.value.set(u.id, u))
+	newSharedInstances.forEach((result) => {
+		if (result.status === 'fulfilled') {
+			cache.sharedInstances.value.set(result.value.id, result.value.instance)
+		}
+	})
 
 	const allVersions = [...newVersions, ...Array.from(cache.versions.value.values())]
 	const fullProjectIds = new Set([
@@ -177,6 +195,10 @@ export async function enrichReportBatch(reports: Report[]): Promise<ExtendedRepo
 			user: report.item_type === 'user' ? cache.users.value.get(report.item_id) : undefined,
 			version,
 			target,
+			shared_instance:
+				report.item_type === 'shared-instance'
+					? cache.sharedInstances.value.get(report.item_id)
+					: undefined,
 		}
 	})
 }
diff --git a/apps/frontend/src/locales/en-US/index.json b/apps/frontend/src/locales/en-US/index.json
index 74a6dfca7..cee25fcc2 100644
--- a/apps/frontend/src/locales/en-US/index.json
+++ b/apps/frontend/src/locales/en-US/index.json
@@ -2921,6 +2921,30 @@
   "layout.publish.email-verification-required.title": {
     "message": "Email verification required"
   },
+  "modal.shared-instance.open-in-app.benefit.install": {
+    "message": "Automatically install the required game and loader"
+  },
+  "modal.shared-instance.open-in-app.benefit.join": {
+    "message": "Join the shared instance in one click"
+  },
+  "modal.shared-instance.open-in-app.benefit.update": {
+    "message": "Keep shared content updated when the instance changes"
+  },
+  "modal.shared-instance.open-in-app.get-app": {
+    "message": "Get Modrinth App"
+  },
+  "modal.shared-instance.open-in-app.managed-by": {
+    "message": "Managed by"
+  },
+  "modal.shared-instance.open-in-app.opening-automatically": {
+    "message": "The Modrinth App will open automatically..."
+  },
+  "modal.shared-instance.open-in-app.title": {
+    "message": "Opening Modrinth App"
+  },
+  "modal.shared-instance.open-in-app.why-use": {
+    "message": "Why use the Modrinth App"
+  },
   "moderation.exclude-technical-review": {
     "message": "Exclude TR"
   },
@@ -5264,6 +5288,33 @@
   "settings.sidebar.label.display": {
     "message": "Display"
   },
+  "shared-instance.invite.accept": {
+    "message": "Accept invite"
+  },
+  "shared-instance.invite.inviter.unknown": {
+    "message": "A Modrinth user"
+  },
+  "shared-instance.invite.joined-count": {
+    "message": "{count, plural, one {# person has} other {# people have}} already joined"
+  },
+  "shared-instance.invite.loading": {
+    "message": "Loading invite…"
+  },
+  "shared-instance.invite.title": {
+    "message": "{name} has invited you to play"
+  },
+  "shared-instance.invite.trust.description": {
+    "message": "This invite was created by another Modrinth user, not Modrinth. Only accept invites from people you trust."
+  },
+  "shared-instance.invite.trust.heading": {
+    "message": "Do you know this user?"
+  },
+  "shared-instance.invite.unavailable.description": {
+    "message": "It may have expired, reached its use limit, or been removed by the person who shared it."
+  },
+  "shared-instance.invite.unavailable.title": {
+    "message": "This invite isn't available"
+  },
   "ui.latest-news-row.latest-news": {
     "message": "Latest news from Modrinth"
   },
diff --git a/apps/frontend/src/middleware/project.global.ts b/apps/frontend/src/middleware/project.global.ts
index 3b11fca38..f8872b153 100644
--- a/apps/frontend/src/middleware/project.global.ts
+++ b/apps/frontend/src/middleware/project.global.ts
@@ -99,6 +99,7 @@ async function getProjectMiddlewareClient() {
 	return createModrinthClient(auth, {
 		apiBaseUrl: config.public.apiBaseUrl.replace('/v2/', '/'),
 		archonBaseUrl: config.public.pyroBaseUrl.replace('/v2/', '/'),
+		sharedInstancesBaseUrl: config.public.sharedInstancesBaseUrl,
 		rateLimitKey: config.rateLimitKey,
 	})
 }
diff --git a/apps/frontend/src/pages/dashboard/notifications.vue b/apps/frontend/src/pages/dashboard/notifications.vue
index d3fabd898..a53fc72c7 100644
--- a/apps/frontend/src/pages/dashboard/notifications.vue
+++ b/apps/frontend/src/pages/dashboard/notifications.vue
@@ -154,12 +154,15 @@ const { data, isPending, error, refetch } = useQuery({
 		const notifications = await client.labrinth.notifications_v2.getUserNotifications(
 			auth.value?.user?.id,
 		)
+		const visibleNotifications = notifications.filter(
+			(n) => !n.type?.startsWith('shared_instance_'),
+		)
 
 		const typesInFeed = [
-			...new Set(notifications.filter((n) => showRead || !n.read).map((n) => n.type)),
+			...new Set(visibleNotifications.filter((n) => showRead || !n.read).map((n) => n.type)),
 		]
 
-		const filtered = notifications.filter(
+		const filtered = visibleNotifications.filter(
 			(n) =>
 				(selectedType.value === 'all' || n.type === selectedType.value) && (showRead || !n.read),
 		)
@@ -173,7 +176,7 @@ const { data, isPending, error, refetch } = useQuery({
 			notifications: notifs,
 			notifTypes: typesInFeed.length > 1 ? ['all', ...typesInFeed] : typesInFeed,
 			pages,
-			hasRead: notifications.some((n) => n.read),
+			hasRead: visibleNotifications.some((n) => n.read),
 		}))
 	},
 	enabled: computed(() => !!auth.value?.user?.id),
diff --git a/apps/frontend/src/pages/moderation/reports/[report].vue b/apps/frontend/src/pages/moderation/reports/[report].vue
index 426583bf9..806545561 100644
--- a/apps/frontend/src/pages/moderation/reports/[report].vue
+++ b/apps/frontend/src/pages/moderation/reports/[report].vue
@@ -1,6 +1,5 @@
 <script setup lang="ts">
 import { injectModrinthClient } from '@modrinth/ui'
-import type { Report } from '@modrinth/utils'
 import { useQuery } from '@tanstack/vue-query'
 
 import ModerationReportCard from '~/components/ui/moderation/ModerationReportCard.vue'
@@ -13,8 +12,8 @@ const { data: report } = useQuery({
 	queryKey: computed(() => ['report', reportId]),
 	queryFn: async () => {
 		try {
-			const report = (await client.labrinth.reports_v3.get(reportId)) as Report
-			const enrichedReport = (await enrichReportBatch([report]))[0]
+			const report = await client.labrinth.reports_v3.get(reportId)
+			const enrichedReport = (await enrichReportBatch([report], client))[0]
 			return enrichedReport
 		} catch (error) {
 			console.error('Error fetching report:', error)
diff --git a/apps/frontend/src/pages/moderation/reports/index.vue b/apps/frontend/src/pages/moderation/reports/index.vue
index 290bcfd62..8f231c28e 100644
--- a/apps/frontend/src/pages/moderation/reports/index.vue
+++ b/apps/frontend/src/pages/moderation/reports/index.vue
@@ -177,7 +177,7 @@
 
 		<div class="flex flex-col gap-4">
 			<div v-if="paginatedReports.length === 0" class="universal-card h-24 animate-pulse"></div>
-			<ReportCard v-for="report in paginatedReports" v-else :key="report.id" :report="report" />
+			<ReportCard v-for="report in paginatedReports" :key="report.id" :report="report" />
 		</div>
 
 		<div v-if="totalPages > 1" class="mt-4 flex justify-center">
@@ -204,13 +204,13 @@ import {
 	type ComboboxOption,
 	commonMessages,
 	FloatingPanel,
+	injectModrinthClient,
 	MultiSelect,
 	type MultiSelectItem,
 	Pagination,
 	StyledInput,
 	useVIntl,
 } from '@modrinth/ui'
-import type { Report, User } from '@modrinth/utils'
 import Fuse from 'fuse.js'
 
 import ReportCard from '~/components/ui/moderation/ModerationReportCard.vue'
@@ -222,6 +222,7 @@ const { formatMessage } = useVIntl()
 const route = useRoute()
 const router = useRouter()
 const auth = await useAuth()
+const client = injectModrinthClient()
 
 const { data: allReports } = await useLazyAsyncData('new-moderation-reports', async () => {
 	const startTime = performance.now()
@@ -231,19 +232,19 @@ const { data: allReports } = await useLazyAsyncData('new-moderation-reports', as
 
 	const enrichmentPromises: Promise<ExtendedReport[]>[] = []
 
-	let reports: Report[]
+	let reports: Labrinth.Reports.v3.Report[]
 	let hasMoreReports = true
 	while (hasMoreReports) {
 		reports = (await useBaseFetch(`report?count=${REPORT_ENDPOINT_COUNT}&offset=${currentOffset}`, {
 			apiVersion: 3,
-		})) as Report[]
+		})) as Labrinth.Reports.v3.Report[]
 
 		hasMoreReports = reports.length > 0
 		if (!hasMoreReports) {
 			break
 		}
 
-		const enrichmentPromise = enrichReportBatch(reports)
+		const enrichmentPromise = enrichReportBatch(reports, client)
 		enrichmentPromises.push(enrichmentPromise)
 
 		// this is explicitly not the length of the reports array, because the API may return fewer reports due to a report in the middle not being
@@ -323,6 +324,7 @@ const projectTypeFilterTypes: ComboboxOption<string>[] = [
 	{ value: 'plugin', label: 'Plugins' },
 	{ value: 'shader', label: 'Shaders' },
 	{ value: 'minecraft_java_server', label: 'Servers' },
+	{ value: 'shared-instance', label: 'Shared instance' },
 ]
 
 const currentReportTargetFilter = ref('all')
@@ -331,6 +333,7 @@ const reportTargetFilterTypes: ComboboxOption<string>[] = [
 	{ value: 'project', label: 'Projects' },
 	{ value: 'user', label: 'Users' },
 	{ value: 'version', label: 'Versions' },
+	{ value: 'shared-instance', label: 'Shared instances' },
 ]
 
 const currentReportIssueFilter = ref('all')
@@ -505,7 +508,9 @@ const filteredReports = computed(() => {
 	}
 
 	const projectTypeFilterPredicate = (report: ExtendedReport) => {
-		return projectTypeFilter === 'all' || report.project?.project_type === projectTypeFilter
+		if (projectTypeFilter === 'all') return true
+		if (projectTypeFilter === 'shared-instance') return report.item_type === 'shared-instance'
+		return report.project?.project_type === projectTypeFilter
 	}
 
 	const reportTargetFilterPredicate = (report: ExtendedReport) => {
diff --git a/apps/frontend/src/pages/share/[inviteId].vue b/apps/frontend/src/pages/share/[inviteId].vue
new file mode 100644
index 000000000..3e697d967
--- /dev/null
+++ b/apps/frontend/src/pages/share/[inviteId].vue
@@ -0,0 +1,262 @@
+<template>
+	<main
+		class="relative isolate min-h-screen overflow-hidden bg-surface-1 px-4 pb-16 pt-36 sm:pt-52"
+	>
+		<div
+			class="absolute left-1/2 top-0 -z-10 h-[23.3125rem] w-full -translate-x-1/2 overflow-hidden rounded-none !rounded-b-none sm:top-10 sm:w-[min(70rem,100%)] sm:rounded-[2.375rem]"
+			aria-hidden="true"
+		>
+			<img
+				:src="InviteBackgroundIllustration"
+				class="absolute inset-0 size-full scale-[2] object-cover object-[center_25%]"
+				alt=""
+			/>
+			<img
+				v-if="instanceIcon"
+				:src="instanceIcon"
+				class="absolute -inset-1/2 size-[200%] object-cover opacity-90 blur-[160px] saturate-200 [mix-blend-mode:color]"
+				alt=""
+			/>
+			<div
+				class="absolute inset-0 bg-[linear-gradient(to_bottom,transparent_20%,var(--surface-1)_100%)]"
+			/>
+		</div>
+		<SharedInstanceInviteOpenInAppModal ref="openInAppModal" />
+
+		<div v-if="isPending" class="relative z-10 flex flex-col items-center gap-4 text-secondary">
+			<LoaderCircleIcon class="size-10 animate-spin" />
+			<span>{{ formatMessage(messages.loadingInvite) }}</span>
+		</div>
+
+		<div
+			v-else-if="error || !invite"
+			class="relative z-10 mx-auto flex max-w-md flex-col items-center gap-5 text-center"
+		>
+			<CircleAlertIcon class="size-12 text-secondary" />
+			<div class="flex flex-col gap-2">
+				<h1 class="m-0 text-2xl font-semibold text-contrast">
+					{{ formatMessage(messages.unavailableTitle) }}
+				</h1>
+				<p class="m-0 text-primary">
+					{{ formatMessage(messages.unavailableDescription) }}
+				</p>
+			</div>
+		</div>
+
+		<div
+			v-else
+			class="relative z-10 mx-auto flex w-full max-w-[26.25rem] flex-col items-center gap-7"
+		>
+			<div class="invite-avatar relative size-[120px] shrink-0 rounded-full">
+				<Avatar
+					:src="inviterAvatar"
+					:alt="inviterName"
+					size="120px"
+					circle
+					class="!border-0 !shadow-none"
+				/>
+			</div>
+
+			<div class="flex flex-col items-center gap-4 text-center">
+				<div class="flex flex-col items-center gap-2.5">
+					<h1 class="m-0 text-2xl font-semibold leading-8 text-contrast">
+						{{ formatMessage(messages.invitationTitle, { name: inviterName }) }}
+					</h1>
+					<div
+						class="flex w-max max-w-[calc(100vw-2rem)] flex-nowrap items-center justify-center gap-1.5 overflow-hidden whitespace-nowrap text-lg leading-6 text-primary"
+					>
+						<span
+							class="flex min-w-0 max-w-full items-center gap-1.5 whitespace-nowrap rounded-xl font-semibold text-contrast"
+						>
+							<Avatar :src="instanceIcon" :alt="invite.instance_name" size="32px" no-shadow />
+							<span class="min-w-0 truncate whitespace-nowrap">{{ invite.instance_name }}</span>
+						</span>
+					</div>
+				</div>
+				<div
+					v-if="instanceUsers.length"
+					class="flex items-center gap-2 rounded-full border border-solid border-surface-3 bg-surface-2 px-4 py-2 text-primary [box-shadow:0_1px_1px_rgb(0_0_0/12%)]"
+				>
+					<div class="flex shrink-0 items-center">
+						<Avatar
+							v-for="(user, index) in visibleInstanceUsers"
+							:key="user.id"
+							:src="user.avatar"
+							:alt="user.name"
+							:tint-by="user.id"
+							size="28px"
+							circle
+							no-shadow
+							class="!border-2 !border-surface-2"
+							:class="{ '-mr-1.5': index < visibleInstanceUsers.length - 1 || hiddenUserCount > 0 }"
+						/>
+						<div
+							v-if="hiddenUserCount"
+							class="flex size-7 items-center justify-center rounded-full border-2 border-solid border-surface-2 bg-surface-3 text-xs font-medium leading-4 text-primary"
+						>
+							+{{ hiddenUserCount }}
+						</div>
+					</div>
+					{{ formatMessage(messages.joinedCount, { count: instanceUsers.length }) }}
+				</div>
+			</div>
+
+			<ButtonStyled color="brand" size="large">
+				<button type="button" @click="acceptInvite">
+					<UserPlusIcon />
+					{{ formatMessage(messages.acceptInvite) }}
+				</button>
+			</ButtonStyled>
+
+			<div class="flex w-full flex-col gap-2.5">
+				<span class="pl-3 font-medium text-primary">{{
+					formatMessage(messages.knowThisUser)
+				}}</span>
+				<Admonition type="neutral" class="shadow-card !text-primary">
+					<template #icon="{ iconClass }">
+						<CircleAlertIcon :class="[...iconClass, '!text-orange']" />
+					</template>
+					{{ formatMessage(messages.trustWarning) }}
+				</Admonition>
+			</div>
+		</div>
+	</main>
+</template>
+
+<script setup lang="ts">
+import {
+	CircleAlertIcon,
+	InviteBackgroundIllustration,
+	LoaderCircleIcon,
+	UserPlusIcon,
+} from '@modrinth/assets'
+import {
+	Admonition,
+	Avatar,
+	ButtonStyled,
+	defineMessages,
+	injectModrinthClient,
+	useVIntl,
+} from '@modrinth/ui'
+import { useQuery } from '@tanstack/vue-query'
+import { computed, onServerPrefetch, useTemplateRef } from 'vue'
+
+import SharedInstanceInviteOpenInAppModal from '~/components/ui/SharedInstanceInviteOpenInAppModal.vue'
+
+useSeoMeta({
+	robots: 'noindex',
+})
+
+const { formatMessage } = useVIntl()
+
+const messages = defineMessages({
+	loadingInvite: {
+		id: 'shared-instance.invite.loading',
+		defaultMessage: 'Loading invite…',
+	},
+	unavailableTitle: {
+		id: 'shared-instance.invite.unavailable.title',
+		defaultMessage: "This invite isn't available",
+	},
+	unavailableDescription: {
+		id: 'shared-instance.invite.unavailable.description',
+		defaultMessage:
+			'It may have expired, reached its use limit, or been removed by the person who shared it.',
+	},
+	invitationTitle: {
+		id: 'shared-instance.invite.title',
+		defaultMessage: '{name} has invited you to play',
+	},
+	unknownInviter: {
+		id: 'shared-instance.invite.inviter.unknown',
+		defaultMessage: 'A Modrinth user',
+	},
+	joinedCount: {
+		id: 'shared-instance.invite.joined-count',
+		defaultMessage: '{count, plural, one {# person has} other {# people have}} already joined',
+	},
+	acceptInvite: {
+		id: 'shared-instance.invite.accept',
+		defaultMessage: 'Accept invite',
+	},
+	knowThisUser: {
+		id: 'shared-instance.invite.trust.heading',
+		defaultMessage: 'Do you know this user?',
+	},
+	trustWarning: {
+		id: 'shared-instance.invite.trust.description',
+		defaultMessage:
+			'This invite was created by another Modrinth user, not Modrinth. Only accept invites from people you trust.',
+	},
+})
+
+const route = useRoute()
+const client = injectModrinthClient()
+const inviteId = computed(() => String(route.params.inviteId))
+const openInAppModal = useTemplateRef('openInAppModal')
+
+const {
+	data: invite,
+	error,
+	isPending,
+	suspense,
+} = useQuery({
+	queryKey: computed(() => ['shared-instance-invite', inviteId.value]),
+	queryFn: () => client.sharedinstances.invites_v1.get(inviteId.value),
+	retry: false,
+})
+
+const instanceIcon = computed(() => invite.value?.instance_icon ?? null)
+const instanceUsers = computed(() => {
+	if (!invite.value) return []
+	const managerIds = new Set(
+		invite.value.managers.flatMap((manager) => (manager.type === 'user' ? [manager.id] : [])),
+	)
+	return (
+		invite.value.instance_users?.filter(
+			(user) => user.joined_at !== null && !managerIds.has(user.id),
+		) ?? []
+	)
+})
+const visibleInstanceUsers = computed(() => instanceUsers.value.slice(0, 4))
+const hiddenUserCount = computed(() =>
+	Math.max(0, instanceUsers.value.length - visibleInstanceUsers.value.length),
+)
+
+onServerPrefetch(() => suspense())
+
+const inviter = computed(
+	() =>
+		invite.value?.managers.find((manager) => manager.type === 'user') ?? invite.value?.managers[0],
+)
+const inviterName = computed(() => inviter.value?.name ?? formatMessage(messages.unknownInviter))
+const inviterAvatar = computed(() => {
+	if (!inviter.value) return null
+	return inviter.value.type === 'user' ? inviter.value.avatar : inviter.value.icon
+})
+
+function acceptInvite() {
+	if (!invite.value) return
+
+	openInAppModal.value?.show({
+		instance: {
+			inviteId: inviteId.value,
+			name: invite.value.instance_name,
+			icon: invite.value.instance_icon,
+			inviterName: inviterName.value,
+			inviterAvatar: inviterAvatar.value,
+		},
+	})
+}
+</script>
+
+<style scoped>
+.invite-avatar {
+	box-shadow:
+		0 0 0 8px rgb(255 255 255 / 5%),
+		0 24px 48px rgb(0 0 0 / 3%),
+		0 10px 18px rgb(0 0 0 / 3%),
+		0 5px 8px rgb(0 0 0 / 4%),
+		0 2px 4px rgb(0 0 0 / 4%);
+}
+</style>
diff --git a/apps/frontend/src/providers/setup/modrinth-client.ts b/apps/frontend/src/providers/setup/modrinth-client.ts
index 0f5d13ede..a6f2c8911 100644
--- a/apps/frontend/src/providers/setup/modrinth-client.ts
+++ b/apps/frontend/src/providers/setup/modrinth-client.ts
@@ -7,6 +7,7 @@ export function setupModrinthClientProvider(auth: Awaited<ReturnType<typeof useA
 	const client = createModrinthClient(auth, {
 		apiBaseUrl: config.public.apiBaseUrl.replace('/v2/', '/'),
 		archonBaseUrl: config.public.pyroBaseUrl.replace('/v2/', '/'),
+		sharedInstancesBaseUrl: config.public.sharedInstancesBaseUrl,
 		rateLimitKey: config.rateLimitKey,
 	})
 	provideModrinthClient(client)
diff --git a/apps/frontend/src/server/utils/api-client.ts b/apps/frontend/src/server/utils/api-client.ts
index 0352ddb8e..193a8d09a 100644
--- a/apps/frontend/src/server/utils/api-client.ts
+++ b/apps/frontend/src/server/utils/api-client.ts
@@ -25,6 +25,8 @@ export interface ServerModrinthClientOptions {
 export function useServerModrinthClient(options?: ServerModrinthClientOptions): NuxtModrinthClient {
 	const config = useRuntimeConfig(options?.event)
 	const apiBaseUrl = (config.apiBaseUrl || config.public.apiBaseUrl).replace('/v2/', '/')
+	const sharedInstancesBaseUrl =
+		config.sharedInstancesBaseUrl || config.public.sharedInstancesBaseUrl
 
 	const features = []
 
@@ -39,6 +41,7 @@ export function useServerModrinthClient(options?: ServerModrinthClientOptions):
 
 	const clientConfig: NuxtClientConfig = {
 		labrinthBaseUrl: apiBaseUrl,
+		sharedInstancesBaseUrl,
 		rateLimitKey: config.rateLimitKey || getRateLimitKeyFromSecretsStore,
 		features,
 	}
diff --git a/apps/frontend/wrangler.jsonc b/apps/frontend/wrangler.jsonc
index c63b22f59..17d5bb136 100644
--- a/apps/frontend/wrangler.jsonc
+++ b/apps/frontend/wrangler.jsonc
@@ -43,6 +43,7 @@
 		"BASE_URL": "https://api.modrinth.com/v2/",
 		"BROWSER_BASE_URL": "https://api.modrinth.com/v2/",
 		"PYRO_BASE_URL": "https://archon.modrinth.com/",
+		"SHARED_INSTANCES_API_BASE_URL": "https://shared-instances.modrinth.com",
 		"STRIPE_PUBLISHABLE_KEY": "pk_live_51JbFxJJygY5LJFfKLVVldb10HlLt24p421OWRsTOWc5sXYFOnFUXWieSc6HD3PHo25ktx8db1WcHr36XGFvZFVUz00V9ixrCs5"
 	},
 	"env": {
@@ -58,6 +59,7 @@
 				"BASE_URL": "https://staging-api.modrinth.com/v2/",
 				"BROWSER_BASE_URL": "https://staging-api.modrinth.com/v2/",
 				"PYRO_BASE_URL": "https://staging-archon.modrinth.com/",
+				"SHARED_INSTANCES_API_BASE_URL": "https://staging-shared-instances.modrinth.com",
 				"STRIPE_PUBLISHABLE_KEY": "pk_test_51JbFxJJygY5LJFfKV50mnXzz3YLvBVe2Gd1jn7ljWAkaBlRz3VQdxN9mXcPSrFbSqxwAb0svte9yhnsmm7qHfcWn00R611Ce7b"
 			},
 			"secrets_store_secrets": [
diff --git a/apps/labrinth/src/routes/v3/version_creation.rs b/apps/labrinth/src/routes/v3/version_creation.rs
index 50dba0426..aa64d8469 100644
--- a/apps/labrinth/src/routes/v3/version_creation.rs
+++ b/apps/labrinth/src/routes/v3/version_creation.rs
@@ -925,9 +925,9 @@ pub async fn upload_file(
         ));
     }
 
-    if file_name.contains('/') {
+    if !path_util::is_safe_file_name(file_name) {
         return Err(CreateError::InvalidInput(
-            "File names must not contain slashes!".to_string(),
+            "file names must be a single safe path component".to_string(),
         ));
     }
 
diff --git a/packages/api-client/src/core/abstract-client.ts b/packages/api-client/src/core/abstract-client.ts
index 70c2f1584..9f3c6b2dc 100644
--- a/packages/api-client/src/core/abstract-client.ts
+++ b/packages/api-client/src/core/abstract-client.ts
@@ -43,6 +43,7 @@ export abstract class AbstractModrinthClient extends AbstractUploadClient {
 	public readonly launchermeta!: InferredClientModules['launchermeta']
 	public readonly paper!: InferredClientModules['paper']
 	public readonly purpur!: InferredClientModules['purpur']
+	public readonly sharedinstances!: InferredClientModules['sharedinstances']
 
 	constructor(config: ClientConfig) {
 		super()
@@ -50,6 +51,7 @@ export abstract class AbstractModrinthClient extends AbstractUploadClient {
 			timeout: 10000,
 			labrinthBaseUrl: 'https://api.modrinth.com',
 			archonBaseUrl: 'https://archon.modrinth.com',
+			sharedInstancesBaseUrl: 'https://shared-instances.modrinth.com',
 			...config,
 		}
 		this.features = config.features ?? []
@@ -123,6 +125,8 @@ export abstract class AbstractModrinthClient extends AbstractUploadClient {
 			baseUrl = this.resolveBaseUrl(this.config.labrinthBaseUrl!)
 		} else if (options.api === 'archon') {
 			baseUrl = this.resolveBaseUrl(this.config.archonBaseUrl!)
+		} else if (options.api === 'sharedinstances') {
+			baseUrl = this.resolveBaseUrl(this.config.sharedInstancesBaseUrl!)
 		} else {
 			baseUrl = options.api
 		}
@@ -170,6 +174,8 @@ export abstract class AbstractModrinthClient extends AbstractUploadClient {
 			baseUrl = this.resolveBaseUrl(this.config.labrinthBaseUrl!)
 		} else if (options.api === 'archon') {
 			baseUrl = this.resolveBaseUrl(this.config.archonBaseUrl!)
+		} else if (options.api === 'sharedinstances') {
+			baseUrl = this.resolveBaseUrl(this.config.sharedInstancesBaseUrl!)
 		} else {
 			baseUrl = options.api
 		}
diff --git a/packages/api-client/src/modules/index.ts b/packages/api-client/src/modules/index.ts
index e435d2f82..01ab392f6 100644
--- a/packages/api-client/src/modules/index.ts
+++ b/packages/api-client/src/modules/index.ts
@@ -57,6 +57,10 @@ import { MclogsInsightsV1Module } from './mclogs/insights/v1'
 import { MclogsLogsV1Module } from './mclogs/logs/v1'
 import { PaperVersionsV3Module } from './paper/v3'
 import { PurpurVersionsV2Module } from './purpur/v2'
+import { SharedInstancesInstancesV1Module } from './shared-instances/instances/v1'
+import { SharedInstancesInvitesV1Module } from './shared-instances/invites/v1'
+import { SharedInstancesModerationV1Module } from './shared-instances/moderation/v1'
+import { SharedInstancesUsersV1Module } from './shared-instances/users/v1'
 
 type ModuleConstructor = new (client: AbstractModrinthClient) => AbstractModule
 
@@ -128,6 +132,10 @@ export const MODULE_REGISTRY = {
 	labrinth_versions_v3: LabrinthVersionsV3Module,
 	paper_versions_v3: PaperVersionsV3Module,
 	purpur_versions_v2: PurpurVersionsV2Module,
+	sharedinstances_invites_v1: SharedInstancesInvitesV1Module,
+	sharedinstances_instances_v1: SharedInstancesInstancesV1Module,
+	sharedinstances_moderation_v1: SharedInstancesModerationV1Module,
+	sharedinstances_users_v1: SharedInstancesUsersV1Module,
 } as const satisfies Record<string, ModuleConstructor>
 
 export type ModuleID = keyof typeof MODULE_REGISTRY
diff --git a/packages/api-client/src/modules/labrinth/images/v3.ts b/packages/api-client/src/modules/labrinth/images/v3.ts
index 7613f0deb..c9e058523 100644
--- a/packages/api-client/src/modules/labrinth/images/v3.ts
+++ b/packages/api-client/src/modules/labrinth/images/v3.ts
@@ -21,7 +21,7 @@ function buildImageQueryParams(
 			params.thread_message_id = target.thread_message_id
 			break
 		case 'report':
-			params.report_id = target.report_id
+			if (target.report_id) params.report_id = target.report_id
 			break
 	}
 	return params
diff --git a/packages/api-client/src/modules/labrinth/types.ts b/packages/api-client/src/modules/labrinth/types.ts
index 6e823c614..9789cc6df 100644
--- a/packages/api-client/src/modules/labrinth/types.ts
+++ b/packages/api-client/src/modules/labrinth/types.ts
@@ -434,7 +434,7 @@ export namespace Labrinth {
 				| { context: 'project'; project_id: string }
 				| { context: 'version'; version_id: string }
 				| { context: 'thread_message'; thread_message_id: string }
-				| { context: 'report'; report_id: string }
+				| { context: 'report'; report_id: string | null }
 			)
 
 			export type UploadedImageFor<C extends ImageUploadContext> = Extract<
@@ -450,7 +450,7 @@ export namespace Labrinth {
 				| { context: 'project'; project_id: string }
 				| { context: 'version'; version_id: string }
 				| { context: 'thread_message'; thread_message_id: string }
-				| { context: 'report'; report_id: string }
+				| { context: 'report'; report_id?: string }
 		}
 	}
 
@@ -1917,13 +1917,14 @@ export namespace Labrinth {
 
 	export namespace Reports {
 		export namespace v3 {
-			export type ItemType = 'project' | 'version' | 'user' | 'unknown'
+			export type ItemType = 'project' | 'version' | 'user' | 'shared-instance' | 'unknown'
 
 			export type Report = {
 				id: string
 				report_type: string
 				item_id: string
 				item_type: ItemType
+				shared_instance_version_id?: number
 				reporter: string
 				body: string
 				created: string
diff --git a/packages/api-client/src/modules/shared-instances/instances/v1.ts b/packages/api-client/src/modules/shared-instances/instances/v1.ts
new file mode 100644
index 000000000..7b9581046
--- /dev/null
+++ b/packages/api-client/src/modules/shared-instances/instances/v1.ts
@@ -0,0 +1,66 @@
+import { AbstractModule } from '../../../core/abstract-module'
+import type { SharedInstances } from '../types'
+
+export class SharedInstancesInstancesV1Module extends AbstractModule {
+	public getModuleID(): string {
+		return 'sharedinstances_instances_v1'
+	}
+
+	public async get(instanceId: string): Promise<SharedInstances.Instances.v1.Instance> {
+		return this.client.request<SharedInstances.Instances.v1.Instance>(
+			`/instances/${encodeURIComponent(instanceId)}`,
+			{
+				api: 'sharedinstances',
+				version: 1,
+				method: 'GET',
+			},
+		)
+	}
+
+	public async getForUser(userId: string): Promise<string[]> {
+		return this.client.request<string[]>('/instances', {
+			api: 'sharedinstances',
+			version: 1,
+			method: 'GET',
+			params: { user: userId },
+		})
+	}
+
+	public async getUsers(instanceId: string): Promise<SharedInstances.Instances.v1.InstanceUsers> {
+		return this.client.request<SharedInstances.Instances.v1.InstanceUsers>(
+			`/instances/${encodeURIComponent(instanceId)}/users`,
+			{
+				api: 'sharedinstances',
+				version: 1,
+				method: 'GET',
+			},
+		)
+	}
+
+	public async getLatestVersion(
+		instanceId: string,
+	): Promise<SharedInstances.Instances.v1.InstanceVersion> {
+		return this.client.request<SharedInstances.Instances.v1.InstanceVersion>(
+			`/instances/${encodeURIComponent(instanceId)}/versions`,
+			{
+				api: 'sharedinstances',
+				version: 1,
+				method: 'GET',
+			},
+		)
+	}
+
+	public async getVersion(
+		instanceId: string,
+		version: number,
+	): Promise<SharedInstances.Instances.v1.InstanceVersion> {
+		return this.client.request<SharedInstances.Instances.v1.InstanceVersion>(
+			`/instances/${encodeURIComponent(instanceId)}/versions/${version}`,
+			{
+				api: 'sharedinstances',
+				version: 1,
+				method: 'GET',
+			},
+		)
+	}
+}
diff --git a/packages/api-client/src/modules/shared-instances/invites/v1.ts b/packages/api-client/src/modules/shared-instances/invites/v1.ts
new file mode 100644
index 000000000..72536cd0a
--- /dev/null
+++ b/packages/api-client/src/modules/shared-instances/invites/v1.ts
@@ -0,0 +1,21 @@
+import { AbstractModule } from '../../../core/abstract-module'
+import type { SharedInstances } from '../types'
+
+export class SharedInstancesInvitesV1Module extends AbstractModule {
+	public getModuleID(): string {
+		return 'sharedinstances_invites_v1'
+	}
+
+	public async get(inviteId: string): Promise<SharedInstances.Invites.v1.Invite> {
+		return this.client.request<SharedInstances.Invites.v1.Invite>(
+			`/invites/${encodeURIComponent(inviteId)}`,
+			{
+				api: 'sharedinstances',
+				version: 1,
+				method: 'GET',
+				skipAuth: true,
+				retry: false,
+			},
+		)
+	}
+}
diff --git a/packages/api-client/src/modules/shared-instances/moderation/v1.ts b/packages/api-client/src/modules/shared-instances/moderation/v1.ts
new file mode 100644
index 000000000..b70056da9
--- /dev/null
+++ b/packages/api-client/src/modules/shared-instances/moderation/v1.ts
@@ -0,0 +1,41 @@
+import { AbstractModule } from '../../../core/abstract-module'
+import type { SharedInstances } from '../types'
+
+export class SharedInstancesModerationV1Module extends AbstractModule {
+	public getModuleID(): string {
+		return 'sharedinstances_moderation_v1'
+	}
+
+	public async blacklistUsers(
+		request: SharedInstances.Moderation.v1.BlacklistUserRequest,
+	): Promise<void> {
+		return this.client.request('/moderation/blacklist', {
+			api: 'sharedinstances',
+			version: 1,
+			method: 'POST',
+			body: request,
+		})
+	}
+
+	public async unblacklistUsers(
+		request: SharedInstances.Moderation.v1.BlacklistUserRequest,
+	): Promise<void> {
+		return this.client.request('/moderation/blacklist', {
+			api: 'sharedinstances',
+			version: 1,
+			method: 'DELETE',
+			body: request,
+		})
+	}
+
+	public async deleteFile(instanceId: string, version: number, fileName: string): Promise<void> {
+		return this.client.request(
+			`/moderation/instances/${encodeURIComponent(instanceId)}/versions/${version}/files/${encodeURIComponent(fileName)}`,
+			{
+				api: 'sharedinstances',
+				version: 1,
+				method: 'DELETE',
+			},
+		)
+	}
+}
diff --git a/packages/api-client/src/modules/shared-instances/types.ts b/packages/api-client/src/modules/shared-instances/types.ts
new file mode 100644
index 000000000..4ad1e3afb
--- /dev/null
+++ b/packages/api-client/src/modules/shared-instances/types.ts
@@ -0,0 +1,101 @@
+export namespace SharedInstances {
+	export namespace Invites {
+		export namespace v1 {
+			export type UserManager = {
+				id: string
+				name: string
+				type: 'user'
+				avatar?: string | null
+			}
+
+			export type ServerManager = {
+				name: string
+				type: 'server'
+				icon?: string | null
+			}
+
+			export type Manager = UserManager | ServerManager
+
+			export type InviteUser = {
+				id: string
+				name: string
+				avatar?: string | null
+				joined_at: string | null
+			}
+
+			export type Invite = {
+				instance_id: string
+				instance_name: string
+				instance_icon?: string | null
+				game_version: string
+				loader_version: string
+				managers: Manager[]
+				instance_users?: InviteUser[]
+			}
+		}
+	}
+
+	export namespace Instances {
+		export namespace v1 {
+			export type Instance = {
+				name: string
+				icon: string | null
+				quarantine: boolean
+			}
+
+			export type JoinType = 'owner' | 'invite' | 'link'
+
+			export type InstanceUser = {
+				id: string
+				joined_at: string | null
+				join_type: JoinType
+				last_played: string | null
+			}
+
+			export type InstanceUsers = {
+				users: InstanceUser[]
+				tokens: number
+			}
+
+			export type FileMetadata = {
+				path: string
+				hash: string
+			}
+
+			export type ExternalFile = {
+				file_name: string
+				file_type: string
+				url: string
+				file_size?: number
+				metadata?: FileMetadata[]
+			}
+
+			export type InstanceVersion = {
+				version: number
+				modrinth_ids?: string[]
+				ready: boolean
+				external_files: ExternalFile[]
+				modpack_id: string | null
+				game_version: string
+				loader: string
+				loader_version: string
+			}
+		}
+	}
+
+	export namespace Moderation {
+		export namespace v1 {
+			export type BlacklistUserRequest = {
+				user_ids: string[]
+			}
+		}
+	}
+
+	export namespace Users {
+		export namespace v1 {
+			export type BlacklistStatus = {
+				blacklisted: boolean
+			}
+		}
+	}
+}
diff --git a/packages/api-client/src/modules/shared-instances/users/v1.ts b/packages/api-client/src/modules/shared-instances/users/v1.ts
new file mode 100644
index 000000000..fafed1965
--- /dev/null
+++ b/packages/api-client/src/modules/shared-instances/users/v1.ts
@@ -0,0 +1,21 @@
+import { AbstractModule } from '../../../core/abstract-module'
+import type { SharedInstances } from '../types'
+
+export class SharedInstancesUsersV1Module extends AbstractModule {
+	public getModuleID(): string {
+		return 'sharedinstances_users_v1'
+	}
+
+	public async getBlacklistStatus(
+		userId: string,
+	): Promise<SharedInstances.Users.v1.BlacklistStatus> {
+		return this.client.request<SharedInstances.Users.v1.BlacklistStatus>(
+			`/blacklist/${encodeURIComponent(userId)}`,
+			{
+				api: 'sharedinstances',
+				version: 1,
+				method: 'GET',
+			},
+		)
+	}
+}
diff --git a/packages/api-client/src/modules/types.ts b/packages/api-client/src/modules/types.ts
index d86e87723..bd25e5f70 100644
--- a/packages/api-client/src/modules/types.ts
+++ b/packages/api-client/src/modules/types.ts
@@ -6,3 +6,4 @@ export * from './launcher-meta/types'
 export * from './mclogs/types'
 export * from './paper/types'
 export * from './purpur/types'
+export * from './shared-instances/types'
diff --git a/packages/api-client/src/platform/xhr-upload-client.ts b/packages/api-client/src/platform/xhr-upload-client.ts
index 7d6016d5b..4bef70372 100644
--- a/packages/api-client/src/platform/xhr-upload-client.ts
+++ b/packages/api-client/src/platform/xhr-upload-client.ts
@@ -21,6 +21,8 @@ export abstract class XHRUploadClient extends AbstractModrinthClient {
 			baseUrl = this.resolveBaseUrl(this.config.labrinthBaseUrl!)
 		} else if (options.api === 'archon') {
 			baseUrl = this.resolveBaseUrl(this.config.archonBaseUrl!)
+		} else if (options.api === 'sharedinstances') {
+			baseUrl = this.resolveBaseUrl(this.config.sharedInstancesBaseUrl!)
 		} else {
 			baseUrl = options.api
 		}
diff --git a/packages/api-client/src/types/client.ts b/packages/api-client/src/types/client.ts
index 57d33105e..b2b991cc4 100644
--- a/packages/api-client/src/types/client.ts
+++ b/packages/api-client/src/types/client.ts
@@ -50,6 +50,12 @@ export interface ClientConfig {
 	 */
 	archonBaseUrl?: BaseUrlConfig
 
+	/**
+	 * Base URL for the Shared Instances API
+	 * @default 'https://shared-instances.modrinth.com'
+	 */
+	sharedInstancesBaseUrl?: BaseUrlConfig
+
 	/**
 	 * Default request timeout in milliseconds
 	 * @default 10000
diff --git a/packages/api-client/src/types/request.ts b/packages/api-client/src/types/request.ts
index c1545e578..d1a57d884 100644
--- a/packages/api-client/src/types/request.ts
+++ b/packages/api-client/src/types/request.ts
@@ -11,6 +11,7 @@ export type RequestOptions = {
 	 * API to use for this request
 	 * - 'labrinth': Main Modrinth API (resolves to labrinthBaseUrl)
 	 * - 'archon': Modrinth Hosting API (resolves to archonBaseUrl)
+	 * - 'sharedinstances': Shared Instances API (resolves to sharedInstancesBaseUrl)
 	 * - string: Custom base URL (e.g., 'https://custom-api.com')
 	 */
 	api: 'labrinth' | 'archon' | string
diff --git a/packages/app-lib/.env.local b/packages/app-lib/.env.local
index 198438ffe..0fa04b5dd 100644
--- a/packages/app-lib/.env.local
+++ b/packages/app-lib/.env.local
@@ -1,5 +1,6 @@
 MODRINTH_URL=http://localhost:3000/
 MODRINTH_API_BASE_URL=http://localhost:8000/
+SHARED_INSTANCES_API_BASE_URL=https://staging-shared-instances.modrinth.com/
 MODRINTH_API_URL=http://127.0.0.1:8000/v2/
 MODRINTH_API_URL_V3=http://127.0.0.1:8000/v3/
 MODRINTH_SOCKET_URL=ws://127.0.0.1:8000/
diff --git a/packages/app-lib/.env.prod b/packages/app-lib/.env.prod
index 94f2c2d34..8459f8a61 100644
--- a/packages/app-lib/.env.prod
+++ b/packages/app-lib/.env.prod
@@ -1,5 +1,6 @@
 MODRINTH_URL=https://modrinth.com/
 MODRINTH_API_BASE_URL=https://api.modrinth.com/
+SHARED_INSTANCES_API_BASE_URL=https://shared-instances.modrinth.com/
 MODRINTH_ARCHON_BASE_URL=https://archon.modrinth.com/
 MODRINTH_API_URL=https://api.modrinth.com/v2/
 MODRINTH_API_URL_V3=https://api.modrinth.com/v3/
diff --git a/packages/app-lib/.env.prod-with-staging-archon b/packages/app-lib/.env.prod-with-staging-archon
index b2d549c0e..d27b54338 100644
--- a/packages/app-lib/.env.prod-with-staging-archon
+++ b/packages/app-lib/.env.prod-with-staging-archon
@@ -1,5 +1,6 @@
 MODRINTH_URL=https://modrinth.com/
 MODRINTH_API_BASE_URL=https://api.modrinth.com/
+SHARED_INSTANCES_API_BASE_URL=https://shared-instances.modrinth.com/
 MODRINTH_ARCHON_BASE_URL=https://staging-archon.modrinth.com/
 MODRINTH_API_URL=https://api.modrinth.com/v2/
 MODRINTH_API_URL_V3=https://api.modrinth.com/v3/
diff --git a/packages/app-lib/.env.staging b/packages/app-lib/.env.staging
index 0094b73e5..7b6fe6a17 100644
--- a/packages/app-lib/.env.staging
+++ b/packages/app-lib/.env.staging
@@ -1,5 +1,6 @@
 MODRINTH_URL=https://staging.modrinth.com/
 MODRINTH_API_BASE_URL=https://staging-api.modrinth.com/
+SHARED_INSTANCES_API_BASE_URL=https://staging-shared-instances.modrinth.com/
 MODRINTH_ARCHON_BASE_URL=https://staging-archon.modrinth.com/
 MODRINTH_API_URL=https://staging-api.modrinth.com/v2/
 MODRINTH_API_URL_V3=https://staging-api.modrinth.com/v3/
diff --git a/packages/app-lib/.sqlx/query-0a708a6410e4d7d4cbdb07fa6ea32383be454526177686a0685a988af747db0f.json b/packages/app-lib/.sqlx/query-0a708a6410e4d7d4cbdb07fa6ea32383be454526177686a0685a988af747db0f.json
new file mode 100644
index 000000000..b4cb1c6ed
--- /dev/null
+++ b/packages/app-lib/.sqlx/query-0a708a6410e4d7d4cbdb07fa6ea32383be454526177686a0685a988af747db0f.json
@@ -0,0 +1,296 @@
+{
+  "db_name": "SQLite",
+  "query": "\n                SELECT\n                    i.id AS \"id!: String\",\n                    i.path AS \"path!: String\",\n                    i.applied_content_set_id AS \"applied_content_set_id?: String\",\n                    i.install_stage AS \"install_stage!: String\",\n                    i.launcher_feature_version AS \"launcher_feature_version!: String\",\n                    i.update_channel AS \"update_channel!: String\",\n                    i.name AS \"name!: String\",\n                    i.icon_path AS \"icon_path?: String\",\n                    i.created AS \"created!: i64\",\n                    i.modified AS \"modified!: i64\",\n                    i.last_played AS \"last_played?: i64\",\n                    i.submitted_time_played AS \"submitted_time_played!: i64\",\n                    i.recent_time_played AS \"recent_time_played!: i64\",\n                    cs.id AS \"content_set_id?: String\",\n                    cs.instance_id AS \"content_set_instance_id?: String\",\n                    cs.name AS \"content_set_name?: String\",\n                    cs.source_kind AS \"content_set_source_kind?: String\",\n                    cs.status AS \"content_set_status?: String\",\n                    cs.game_version AS \"content_set_game_version?: String\",\n                    cs.protocol_version AS \"content_set_protocol_version?: i64\",\n                    cs.loader AS \"content_set_loader?: String\",\n                    cs.loader_version AS \"content_set_loader_version?: String\",\n                    cs.created AS \"content_set_created?: i64\",\n                    cs.modified AS \"content_set_modified?: i64\",\n                    COALESCE(link.link_kind, 'unmanaged') AS \"link_kind!: String\",\n                    link.modrinth_project_id AS \"modrinth_project_id?: String\",\n                    link.modrinth_version_id AS \"modrinth_version_id?: String\",\n                    link.server_project_id AS \"server_project_id?: String\",\n                    link.content_project_id AS \"content_project_id?: String\",\n                    link.content_version_id AS \"content_version_id?: String\",\n                    link.hosting_server_id AS \"hosting_server_id?: String\",\n                    json(link.hosting_instance_ids) AS \"hosting_instance_ids?: String\",\n                    link.hosting_active_instance_id AS \"hosting_active_instance_id?: String\",\n                    link.shared_instance_id AS \"shared_instance_id?: String\",\n                    link.shared_instance_role AS \"shared_instance_role?: String\",\n                    link.shared_instance_manager_id AS \"shared_instance_manager_id?: String\",\n                    link.shared_instance_server_manager_name AS \"shared_instance_server_manager_name?: String\",\n                    link.shared_instance_server_manager_icon_url AS \"shared_instance_server_manager_icon_url?: String\",\n                    link.shared_instance_linked_user_id AS \"shared_instance_linked_user_id?: String\",\n                    sync.applied_update_id AS \"shared_sync_applied_update_id?: String\",\n                    sync.latest_available_update_id AS \"shared_sync_latest_available_update_id?: String\",\n                    sync.status AS \"shared_sync_status?: String\",\n                    link.imported_name AS \"imported_name?: String\",\n                    link.imported_version_number AS \"imported_version_number?: String\",\n                    link.imported_filename AS \"imported_filename?: String\",\n                    COALESCE((\n                        SELECT json_group_array(group_name)\n                        FROM (\n                            SELECT group_name\n                            FROM instance_groups\n                            WHERE instance_id = i.id\n                            ORDER BY group_name\n                        )\n                    ), '[]') AS \"groups!: String\",\n                    json(overrides.overrides) AS \"launch_overrides?: String\"\n                FROM instances i\n                LEFT JOIN instance_content_sets cs\n                    ON cs.id = i.applied_content_set_id\n                    AND cs.instance_id = i.id\n                LEFT JOIN instance_links link\n                    ON link.instance_id = i.id\n                LEFT JOIN instance_content_set_sync_state sync\n                    ON sync.content_set_id = cs.id\n                    AND sync.provider = 'shared_instance'\n                LEFT JOIN instance_launch_overrides overrides\n                    ON overrides.instance_id = i.id\n                WHERE i.id = ?",
+  "describe": {
+    "columns": [
+      {
+        "name": "id!: String",
+        "ordinal": 0,
+        "type_info": "Text"
+      },
+      {
+        "name": "path!: String",
+        "ordinal": 1,
+        "type_info": "Text"
+      },
+      {
+        "name": "applied_content_set_id?: String",
+        "ordinal": 2,
+        "type_info": "Text"
+      },
+      {
+        "name": "install_stage!: String",
+        "ordinal": 3,
+        "type_info": "Text"
+      },
+      {
+        "name": "launcher_feature_version!: String",
+        "ordinal": 4,
+        "type_info": "Text"
+      },
+      {
+        "name": "update_channel!: String",
+        "ordinal": 5,
+        "type_info": "Text"
+      },
+      {
+        "name": "name!: String",
+        "ordinal": 6,
+        "type_info": "Text"
+      },
+      {
+        "name": "icon_path?: String",
+        "ordinal": 7,
+        "type_info": "Text"
+      },
+      {
+        "name": "created!: i64",
+        "ordinal": 8,
+        "type_info": "Integer"
+      },
+      {
+        "name": "modified!: i64",
+        "ordinal": 9,
+        "type_info": "Integer"
+      },
+      {
+        "name": "last_played?: i64",
+        "ordinal": 10,
+        "type_info": "Integer"
+      },
+      {
+        "name": "submitted_time_played!: i64",
+        "ordinal": 11,
+        "type_info": "Integer"
+      },
+      {
+        "name": "recent_time_played!: i64",
+        "ordinal": 12,
+        "type_info": "Integer"
+      },
+      {
+        "name": "content_set_id?: String",
+        "ordinal": 13,
+        "type_info": "Text"
+      },
+      {
+        "name": "content_set_instance_id?: String",
+        "ordinal": 14,
+        "type_info": "Text"
+      },
+      {
+        "name": "content_set_name?: String",
+        "ordinal": 15,
+        "type_info": "Text"
+      },
+      {
+        "name": "content_set_source_kind?: String",
+        "ordinal": 16,
+        "type_info": "Text"
+      },
+      {
+        "name": "content_set_status?: String",
+        "ordinal": 17,
+        "type_info": "Text"
+      },
+      {
+        "name": "content_set_game_version?: String",
+        "ordinal": 18,
+        "type_info": "Text"
+      },
+      {
+        "name": "content_set_protocol_version?: i64",
+        "ordinal": 19,
+        "type_info": "Integer"
+      },
+      {
+        "name": "content_set_loader?: String",
+        "ordinal": 20,
+        "type_info": "Text"
+      },
+      {
+        "name": "content_set_loader_version?: String",
+        "ordinal": 21,
+        "type_info": "Text"
+      },
+      {
+        "name": "content_set_created?: i64",
+        "ordinal": 22,
+        "type_info": "Integer"
+      },
+      {
+        "name": "content_set_modified?: i64",
+        "ordinal": 23,
+        "type_info": "Integer"
+      },
+      {
+        "name": "link_kind!: String",
+        "ordinal": 24,
+        "type_info": "Null"
+      },
+      {
+        "name": "modrinth_project_id?: String",
+        "ordinal": 25,
+        "type_info": "Text"
+      },
+      {
+        "name": "modrinth_version_id?: String",
+        "ordinal": 26,
+        "type_info": "Text"
+      },
+      {
+        "name": "server_project_id?: String",
+        "ordinal": 27,
+        "type_info": "Text"
+      },
+      {
+        "name": "content_project_id?: String",
+        "ordinal": 28,
+        "type_info": "Text"
+      },
+      {
+        "name": "content_version_id?: String",
+        "ordinal": 29,
+        "type_info": "Text"
+      },
+      {
+        "name": "hosting_server_id?: String",
+        "ordinal": 30,
+        "type_info": "Text"
+      },
+      {
+        "name": "hosting_instance_ids?: String",
+        "ordinal": 31,
+        "type_info": "Null"
+      },
+      {
+        "name": "hosting_active_instance_id?: String",
+        "ordinal": 32,
+        "type_info": "Text"
+      },
+      {
+        "name": "shared_instance_id?: String",
+        "ordinal": 33,
+        "type_info": "Text"
+      },
+      {
+        "name": "shared_instance_role?: String",
+        "ordinal": 34,
+        "type_info": "Text"
+      },
+      {
+        "name": "shared_instance_manager_id?: String",
+        "ordinal": 35,
+        "type_info": "Text"
+      },
+      {
+        "name": "shared_instance_server_manager_name?: String",
+        "ordinal": 36,
+        "type_info": "Text"
+      },
+      {
+        "name": "shared_instance_server_manager_icon_url?: String",
+        "ordinal": 37,
+        "type_info": "Text"
+      },
+      {
+        "name": "shared_instance_linked_user_id?: String",
+        "ordinal": 38,
+        "type_info": "Text"
+      },
+      {
+        "name": "shared_sync_applied_update_id?: String",
+        "ordinal": 39,
+        "type_info": "Text"
+      },
+      {
+        "name": "shared_sync_latest_available_update_id?: String",
+        "ordinal": 40,
+        "type_info": "Text"
+      },
+      {
+        "name": "shared_sync_status?: String",
+        "ordinal": 41,
+        "type_info": "Text"
+      },
+      {
+        "name": "imported_name?: String",
+        "ordinal": 42,
+        "type_info": "Text"
+      },
+      {
+        "name": "imported_version_number?: String",
+        "ordinal": 43,
+        "type_info": "Text"
+      },
+      {
+        "name": "imported_filename?: String",
+        "ordinal": 44,
+        "type_info": "Text"
+      },
+      {
+        "name": "groups!: String",
+        "ordinal": 45,
+        "type_info": "Null"
+      },
+      {
+        "name": "launch_overrides?: String",
+        "ordinal": 46,
+        "type_info": "Null"
+      }
+    ],
+    "parameters": {
+      "Right": 1
+    },
+    "nullable": [
+      false,
+      false,
+      true,
+      false,
+      false,
+      false,
+      false,
+      true,
+      false,
+      false,
+      true,
+      false,
+      false,
+      false,
+      false,
+      false,
+      false,
+      false,
+      false,
+      true,
+      false,
+      true,
+      false,
+      false,
+      null,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      null,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      false,
+      true,
+      true,
+      true,
+      null,
+      null
+    ]
+  },
+  "hash": "0a708a6410e4d7d4cbdb07fa6ea32383be454526177686a0685a988af747db0f"
+}
diff --git a/packages/app-lib/.sqlx/query-2bf4029dd68e983460b8a0b06e1209885ef8e87ad2a8666a9cf1c851a2948cbc.json b/packages/app-lib/.sqlx/query-2bf4029dd68e983460b8a0b06e1209885ef8e87ad2a8666a9cf1c851a2948cbc.json
new file mode 100644
index 000000000..76d7ed3fc
--- /dev/null
+++ b/packages/app-lib/.sqlx/query-2bf4029dd68e983460b8a0b06e1209885ef8e87ad2a8666a9cf1c851a2948cbc.json
@@ -0,0 +1,12 @@
+{
+  "db_name": "SQLite",
+  "query": "\n\t\tINSERT INTO instance_content_set_remote_refs (\n\t\t\tcontent_set_id,\n\t\t\tref_type,\n\t\t\tref_id\n\t\t)\n\t\tVALUES (?, ?, ?)\n\t\tON CONFLICT (content_set_id, ref_type) DO UPDATE SET\n\t\t\tref_id = excluded.ref_id\n\t\t",
+  "describe": {
+    "columns": [],
+    "parameters": {
+      "Right": 3
+    },
+    "nullable": []
+  },
+  "hash": "2bf4029dd68e983460b8a0b06e1209885ef8e87ad2a8666a9cf1c851a2948cbc"
+}
diff --git a/packages/app-lib/.sqlx/query-474496fe9b4f0ae920ceef97176dac61544130300cdf2cfc8deb7fbf2efaf8c7.json b/packages/app-lib/.sqlx/query-474496fe9b4f0ae920ceef97176dac61544130300cdf2cfc8deb7fbf2efaf8c7.json
deleted file mode 100644
index 14967a6a1..000000000
--- a/packages/app-lib/.sqlx/query-474496fe9b4f0ae920ceef97176dac61544130300cdf2cfc8deb7fbf2efaf8c7.json
+++ /dev/null
@@ -1,248 +0,0 @@
-{
-  "db_name": "SQLite",
-  "query": "\n        SELECT\n            i.id AS \"id!: String\",\n            i.path AS \"path!: String\",\n            i.applied_content_set_id AS \"applied_content_set_id?: String\",\n            i.install_stage AS \"install_stage!: String\",\n            i.launcher_feature_version AS \"launcher_feature_version!: String\",\n            i.update_channel AS \"update_channel!: String\",\n            i.name AS \"name!: String\",\n            i.icon_path AS \"icon_path?: String\",\n            i.created AS \"created!: i64\",\n            i.modified AS \"modified!: i64\",\n            i.last_played AS \"last_played?: i64\",\n            i.submitted_time_played AS \"submitted_time_played!: i64\",\n            i.recent_time_played AS \"recent_time_played!: i64\",\n            cs.id AS \"content_set_id?: String\",\n            cs.instance_id AS \"content_set_instance_id?: String\",\n            cs.name AS \"content_set_name?: String\",\n            cs.source_kind AS \"content_set_source_kind?: String\",\n            cs.status AS \"content_set_status?: String\",\n            cs.game_version AS \"content_set_game_version?: String\",\n            cs.protocol_version AS \"content_set_protocol_version?: i64\",\n            cs.loader AS \"content_set_loader?: String\",\n            cs.loader_version AS \"content_set_loader_version?: String\",\n            cs.created AS \"content_set_created?: i64\",\n            cs.modified AS \"content_set_modified?: i64\",\n            COALESCE(link.link_kind, 'unmanaged') AS \"link_kind!: String\",\n            link.modrinth_project_id AS \"modrinth_project_id?: String\",\n            link.modrinth_version_id AS \"modrinth_version_id?: String\",\n            link.server_project_id AS \"server_project_id?: String\",\n            link.content_project_id AS \"content_project_id?: String\",\n            link.content_version_id AS \"content_version_id?: String\",\n            link.hosting_server_id AS \"hosting_server_id?: String\",\n            json(link.hosting_instance_ids) AS \"hosting_instance_ids?: String\",\n            link.hosting_active_instance_id AS \"hosting_active_instance_id?: String\",\n            link.shared_instance_id AS \"shared_instance_id?: String\",\n            link.imported_name AS \"imported_name?: String\",\n            link.imported_version_number AS \"imported_version_number?: String\",\n            link.imported_filename AS \"imported_filename?: String\",\n            '[]' AS \"groups!: String\",\n            json(overrides.overrides) AS \"launch_overrides?: String\"\n        FROM instances i\n        LEFT JOIN instance_content_sets cs\n            ON cs.id = i.applied_content_set_id\n            AND cs.instance_id = i.id\n        LEFT JOIN instance_links link\n            ON link.instance_id = i.id\n        LEFT JOIN instance_launch_overrides overrides\n            ON overrides.instance_id = i.id\n        WHERE i.id = ?\n        ",
-  "describe": {
-    "columns": [
-      {
-        "name": "id!: String",
-        "ordinal": 0,
-        "type_info": "Text"
-      },
-      {
-        "name": "path!: String",
-        "ordinal": 1,
-        "type_info": "Text"
-      },
-      {
-        "name": "applied_content_set_id?: String",
-        "ordinal": 2,
-        "type_info": "Text"
-      },
-      {
-        "name": "install_stage!: String",
-        "ordinal": 3,
-        "type_info": "Text"
-      },
-      {
-        "name": "launcher_feature_version!: String",
-        "ordinal": 4,
-        "type_info": "Text"
-      },
-      {
-        "name": "update_channel!: String",
-        "ordinal": 5,
-        "type_info": "Text"
-      },
-      {
-        "name": "name!: String",
-        "ordinal": 6,
-        "type_info": "Text"
-      },
-      {
-        "name": "icon_path?: String",
-        "ordinal": 7,
-        "type_info": "Text"
-      },
-      {
-        "name": "created!: i64",
-        "ordinal": 8,
-        "type_info": "Integer"
-      },
-      {
-        "name": "modified!: i64",
-        "ordinal": 9,
-        "type_info": "Integer"
-      },
-      {
-        "name": "last_played?: i64",
-        "ordinal": 10,
-        "type_info": "Integer"
-      },
-      {
-        "name": "submitted_time_played!: i64",
-        "ordinal": 11,
-        "type_info": "Integer"
-      },
-      {
-        "name": "recent_time_played!: i64",
-        "ordinal": 12,
-        "type_info": "Integer"
-      },
-      {
-        "name": "content_set_id?: String",
-        "ordinal": 13,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_set_instance_id?: String",
-        "ordinal": 14,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_set_name?: String",
-        "ordinal": 15,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_set_source_kind?: String",
-        "ordinal": 16,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_set_status?: String",
-        "ordinal": 17,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_set_game_version?: String",
-        "ordinal": 18,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_set_protocol_version?: i64",
-        "ordinal": 19,
-        "type_info": "Integer"
-      },
-      {
-        "name": "content_set_loader?: String",
-        "ordinal": 20,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_set_loader_version?: String",
-        "ordinal": 21,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_set_created?: i64",
-        "ordinal": 22,
-        "type_info": "Integer"
-      },
-      {
-        "name": "content_set_modified?: i64",
-        "ordinal": 23,
-        "type_info": "Integer"
-      },
-      {
-        "name": "link_kind!: String",
-        "ordinal": 24,
-        "type_info": "Null"
-      },
-      {
-        "name": "modrinth_project_id?: String",
-        "ordinal": 25,
-        "type_info": "Text"
-      },
-      {
-        "name": "modrinth_version_id?: String",
-        "ordinal": 26,
-        "type_info": "Text"
-      },
-      {
-        "name": "server_project_id?: String",
-        "ordinal": 27,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_project_id?: String",
-        "ordinal": 28,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_version_id?: String",
-        "ordinal": 29,
-        "type_info": "Text"
-      },
-      {
-        "name": "hosting_server_id?: String",
-        "ordinal": 30,
-        "type_info": "Text"
-      },
-      {
-        "name": "hosting_instance_ids?: String",
-        "ordinal": 31,
-        "type_info": "Null"
-      },
-      {
-        "name": "hosting_active_instance_id?: String",
-        "ordinal": 32,
-        "type_info": "Text"
-      },
-      {
-        "name": "shared_instance_id?: String",
-        "ordinal": 33,
-        "type_info": "Text"
-      },
-      {
-        "name": "imported_name?: String",
-        "ordinal": 34,
-        "type_info": "Text"
-      },
-      {
-        "name": "imported_version_number?: String",
-        "ordinal": 35,
-        "type_info": "Text"
-      },
-      {
-        "name": "imported_filename?: String",
-        "ordinal": 36,
-        "type_info": "Text"
-      },
-      {
-        "name": "groups!: String",
-        "ordinal": 37,
-        "type_info": "Null"
-      },
-      {
-        "name": "launch_overrides?: String",
-        "ordinal": 38,
-        "type_info": "Null"
-      }
-    ],
-    "parameters": {
-      "Right": 1
-    },
-    "nullable": [
-      false,
-      false,
-      true,
-      false,
-      false,
-      false,
-      false,
-      true,
-      false,
-      false,
-      true,
-      false,
-      false,
-      false,
-      false,
-      false,
-      false,
-      false,
-      false,
-      true,
-      false,
-      true,
-      false,
-      false,
-      null,
-      true,
-      true,
-      true,
-      true,
-      true,
-      true,
-      null,
-      true,
-      true,
-      true,
-      true,
-      true,
-      null,
-      null
-    ]
-  },
-  "hash": "474496fe9b4f0ae920ceef97176dac61544130300cdf2cfc8deb7fbf2efaf8c7"
-}
diff --git a/packages/app-lib/.sqlx/query-6231cfa8f3b21c0fd502e16f823881fd9c44bccaedb9b06585ff8f76146c6e57.json b/packages/app-lib/.sqlx/query-6231cfa8f3b21c0fd502e16f823881fd9c44bccaedb9b06585ff8f76146c6e57.json
new file mode 100644
index 000000000..ad566bf3d
--- /dev/null
+++ b/packages/app-lib/.sqlx/query-6231cfa8f3b21c0fd502e16f823881fd9c44bccaedb9b06585ff8f76146c6e57.json
@@ -0,0 +1,12 @@
+{
+  "db_name": "SQLite",
+  "query": "\n\t\tINSERT INTO instance_content_set_sync_state (\n\t\t\tcontent_set_id,\n\t\t\tprovider,\n\t\t\tapplied_update_id,\n\t\t\tlatest_available_update_id,\n\t\t\tchecked_at,\n\t\t\tstatus\n\t\t)\n\t\tVALUES (?, ?, ?, ?, ?, ?)\n\t\tON CONFLICT (content_set_id) DO UPDATE SET\n\t\t\tprovider = excluded.provider,\n\t\t\tapplied_update_id = excluded.applied_update_id,\n\t\t\tlatest_available_update_id = excluded.latest_available_update_id,\n\t\t\tchecked_at = excluded.checked_at,\n\t\t\tstatus = excluded.status\n\t\t",
+  "describe": {
+    "columns": [],
+    "parameters": {
+      "Right": 6
+    },
+    "nullable": []
+  },
+  "hash": "6231cfa8f3b21c0fd502e16f823881fd9c44bccaedb9b06585ff8f76146c6e57"
+}
diff --git a/packages/app-lib/.sqlx/query-26d23094e9d76e5595d5e5a0cd6bc631c45e6090bf40b26e25024de434fe0281.json b/packages/app-lib/.sqlx/query-6db40d30b3beca48327edfa92dfba2c8b9074904d1012079660de316a20e7dfa.json
similarity index 73%
rename from packages/app-lib/.sqlx/query-26d23094e9d76e5595d5e5a0cd6bc631c45e6090bf40b26e25024de434fe0281.json
rename to packages/app-lib/.sqlx/query-6db40d30b3beca48327edfa92dfba2c8b9074904d1012079660de316a20e7dfa.json
index d0a642ead..f7efeaa54 100644
--- a/packages/app-lib/.sqlx/query-26d23094e9d76e5595d5e5a0cd6bc631c45e6090bf40b26e25024de434fe0281.json
+++ b/packages/app-lib/.sqlx/query-6db40d30b3beca48327edfa92dfba2c8b9074904d1012079660de316a20e7dfa.json
@@ -1,6 +1,6 @@
 {
   "db_name": "SQLite",
-  "query": "\n        SELECT\n            instance_id,\n            link_kind,\n            modrinth_project_id,\n            modrinth_version_id,\n            server_project_id,\n            content_project_id,\n            content_version_id,\n            hosting_server_id,\n            json(hosting_instance_ids) AS \"hosting_instance_ids?: String\",\n            hosting_active_instance_id,\n            shared_instance_id,\n            imported_name,\n            imported_version_number,\n            imported_filename\n        FROM instance_links\n        WHERE instance_id = ?\n        ",
+  "query": "\n        SELECT\n            instance_id,\n            link_kind,\n            modrinth_project_id,\n            modrinth_version_id,\n            server_project_id,\n            content_project_id,\n            content_version_id,\n            hosting_server_id,\n            json(hosting_instance_ids) AS \"hosting_instance_ids?: String\",\n            hosting_active_instance_id,\n            shared_instance_id,\n            shared_instance_role,\n            shared_instance_manager_id,\n            shared_instance_linked_user_id,\n            imported_name,\n            imported_version_number,\n            imported_filename\n        FROM instance_links\n        WHERE instance_id = ?\n        ",
   "describe": {
     "columns": [
       {
@@ -59,19 +59,34 @@
         "type_info": "Text"
       },
       {
-        "name": "imported_name",
+        "name": "shared_instance_role",
         "ordinal": 11,
         "type_info": "Text"
       },
       {
-        "name": "imported_version_number",
+        "name": "shared_instance_manager_id",
         "ordinal": 12,
         "type_info": "Text"
       },
       {
-        "name": "imported_filename",
+        "name": "shared_instance_linked_user_id",
         "ordinal": 13,
         "type_info": "Text"
+      },
+      {
+        "name": "imported_name",
+        "ordinal": 14,
+        "type_info": "Text"
+      },
+      {
+        "name": "imported_version_number",
+        "ordinal": 15,
+        "type_info": "Text"
+      },
+      {
+        "name": "imported_filename",
+        "ordinal": 16,
+        "type_info": "Text"
       }
     ],
     "parameters": {
@@ -91,8 +106,11 @@
       true,
       true,
       true,
+      true,
+      true,
+      true,
       true
     ]
   },
-  "hash": "26d23094e9d76e5595d5e5a0cd6bc631c45e6090bf40b26e25024de434fe0281"
+  "hash": "6db40d30b3beca48327edfa92dfba2c8b9074904d1012079660de316a20e7dfa"
 }
diff --git a/packages/app-lib/.sqlx/query-76988815779ec3c1def6712dcb4156fd72100b0cf97b4ecb11045c6c4f550652.json b/packages/app-lib/.sqlx/query-76988815779ec3c1def6712dcb4156fd72100b0cf97b4ecb11045c6c4f550652.json
new file mode 100644
index 000000000..b829fe372
--- /dev/null
+++ b/packages/app-lib/.sqlx/query-76988815779ec3c1def6712dcb4156fd72100b0cf97b4ecb11045c6c4f550652.json
@@ -0,0 +1,12 @@
+{
+  "db_name": "SQLite",
+  "query": "\n\t\tDELETE FROM instance_content_set_remote_refs\n\t\tWHERE content_set_id = ? AND ref_type = ?\n\t\t",
+  "describe": {
+    "columns": [],
+    "parameters": {
+      "Right": 2
+    },
+    "nullable": []
+  },
+  "hash": "76988815779ec3c1def6712dcb4156fd72100b0cf97b4ecb11045c6c4f550652"
+}
diff --git a/packages/app-lib/.sqlx/query-88a0520cb21aaea25bf12a5ad07e7f0614e912494f850e77dfc502b1afe7c42a.json b/packages/app-lib/.sqlx/query-88a0520cb21aaea25bf12a5ad07e7f0614e912494f850e77dfc502b1afe7c42a.json
new file mode 100644
index 000000000..9372caf04
--- /dev/null
+++ b/packages/app-lib/.sqlx/query-88a0520cb21aaea25bf12a5ad07e7f0614e912494f850e77dfc502b1afe7c42a.json
@@ -0,0 +1,296 @@
+{
+  "db_name": "SQLite",
+  "query": "\n        WITH requested AS (\n            SELECT value AS id, key AS ord\n            FROM json_each(?)\n        )\n        \n                SELECT\n                    i.id AS \"id!: String\",\n                    i.path AS \"path!: String\",\n                    i.applied_content_set_id AS \"applied_content_set_id?: String\",\n                    i.install_stage AS \"install_stage!: String\",\n                    i.launcher_feature_version AS \"launcher_feature_version!: String\",\n                    i.update_channel AS \"update_channel!: String\",\n                    i.name AS \"name!: String\",\n                    i.icon_path AS \"icon_path?: String\",\n                    i.created AS \"created!: i64\",\n                    i.modified AS \"modified!: i64\",\n                    i.last_played AS \"last_played?: i64\",\n                    i.submitted_time_played AS \"submitted_time_played!: i64\",\n                    i.recent_time_played AS \"recent_time_played!: i64\",\n                    cs.id AS \"content_set_id?: String\",\n                    cs.instance_id AS \"content_set_instance_id?: String\",\n                    cs.name AS \"content_set_name?: String\",\n                    cs.source_kind AS \"content_set_source_kind?: String\",\n                    cs.status AS \"content_set_status?: String\",\n                    cs.game_version AS \"content_set_game_version?: String\",\n                    cs.protocol_version AS \"content_set_protocol_version?: i64\",\n                    cs.loader AS \"content_set_loader?: String\",\n                    cs.loader_version AS \"content_set_loader_version?: String\",\n                    cs.created AS \"content_set_created?: i64\",\n                    cs.modified AS \"content_set_modified?: i64\",\n                    COALESCE(link.link_kind, 'unmanaged') AS \"link_kind!: String\",\n                    link.modrinth_project_id AS \"modrinth_project_id?: String\",\n                    link.modrinth_version_id AS \"modrinth_version_id?: String\",\n                    link.server_project_id AS \"server_project_id?: String\",\n                    link.content_project_id AS \"content_project_id?: String\",\n                    link.content_version_id AS \"content_version_id?: String\",\n                    link.hosting_server_id AS \"hosting_server_id?: String\",\n                    json(link.hosting_instance_ids) AS \"hosting_instance_ids?: String\",\n                    link.hosting_active_instance_id AS \"hosting_active_instance_id?: String\",\n                    link.shared_instance_id AS \"shared_instance_id?: String\",\n                    link.shared_instance_role AS \"shared_instance_role?: String\",\n                    link.shared_instance_manager_id AS \"shared_instance_manager_id?: String\",\n                    link.shared_instance_server_manager_name AS \"shared_instance_server_manager_name?: String\",\n                    link.shared_instance_server_manager_icon_url AS \"shared_instance_server_manager_icon_url?: String\",\n                    link.shared_instance_linked_user_id AS \"shared_instance_linked_user_id?: String\",\n                    sync.applied_update_id AS \"shared_sync_applied_update_id?: String\",\n                    sync.latest_available_update_id AS \"shared_sync_latest_available_update_id?: String\",\n                    sync.status AS \"shared_sync_status?: String\",\n                    link.imported_name AS \"imported_name?: String\",\n                    link.imported_version_number AS \"imported_version_number?: String\",\n                    link.imported_filename AS \"imported_filename?: String\",\n                    COALESCE((\n                        SELECT json_group_array(group_name)\n                        FROM (\n                            SELECT group_name\n                            FROM instance_groups\n                            WHERE instance_id = i.id\n                            ORDER BY group_name\n                        )\n                    ), '[]') AS \"groups!: String\",\n                    json(overrides.overrides) AS \"launch_overrides?: String\"\n                \n        FROM requested\n        INNER JOIN instances i\n            ON i.id = requested.id\n        \n                LEFT JOIN instance_content_sets cs\n                    ON cs.id = i.applied_content_set_id\n                    AND cs.instance_id = i.id\n                LEFT JOIN instance_links link\n                    ON link.instance_id = i.id\n                LEFT JOIN instance_content_set_sync_state sync\n                    ON sync.content_set_id = cs.id\n                    AND sync.provider = 'shared_instance'\n                LEFT JOIN instance_launch_overrides overrides\n                    ON overrides.instance_id = i.id\n                ORDER BY requested.ord",
+  "describe": {
+    "columns": [
+      {
+        "name": "id!: String",
+        "ordinal": 0,
+        "type_info": "Text"
+      },
+      {
+        "name": "path!: String",
+        "ordinal": 1,
+        "type_info": "Text"
+      },
+      {
+        "name": "applied_content_set_id?: String",
+        "ordinal": 2,
+        "type_info": "Text"
+      },
+      {
+        "name": "install_stage!: String",
+        "ordinal": 3,
+        "type_info": "Text"
+      },
+      {
+        "name": "launcher_feature_version!: String",
+        "ordinal": 4,
+        "type_info": "Text"
+      },
+      {
+        "name": "update_channel!: String",
+        "ordinal": 5,
+        "type_info": "Text"
+      },
+      {
+        "name": "name!: String",
+        "ordinal": 6,
+        "type_info": "Text"
+      },
+      {
+        "name": "icon_path?: String",
+        "ordinal": 7,
+        "type_info": "Text"
+      },
+      {
+        "name": "created!: i64",
+        "ordinal": 8,
+        "type_info": "Integer"
+      },
+      {
+        "name": "modified!: i64",
+        "ordinal": 9,
+        "type_info": "Integer"
+      },
+      {
+        "name": "last_played?: i64",
+        "ordinal": 10,
+        "type_info": "Integer"
+      },
+      {
+        "name": "submitted_time_played!: i64",
+        "ordinal": 11,
+        "type_info": "Integer"
+      },
+      {
+        "name": "recent_time_played!: i64",
+        "ordinal": 12,
+        "type_info": "Integer"
+      },
+      {
+        "name": "content_set_id?: String",
+        "ordinal": 13,
+        "type_info": "Text"
+      },
+      {
+        "name": "content_set_instance_id?: String",
+        "ordinal": 14,
+        "type_info": "Text"
+      },
+      {
+        "name": "content_set_name?: String",
+        "ordinal": 15,
+        "type_info": "Text"
+      },
+      {
+        "name": "content_set_source_kind?: String",
+        "ordinal": 16,
+        "type_info": "Text"
+      },
+      {
+        "name": "content_set_status?: String",
+        "ordinal": 17,
+        "type_info": "Text"
+      },
+      {
+        "name": "content_set_game_version?: String",
+        "ordinal": 18,
+        "type_info": "Text"
+      },
+      {
+        "name": "content_set_protocol_version?: i64",
+        "ordinal": 19,
+        "type_info": "Integer"
+      },
+      {
+        "name": "content_set_loader?: String",
+        "ordinal": 20,
+        "type_info": "Text"
+      },
+      {
+        "name": "content_set_loader_version?: String",
+        "ordinal": 21,
+        "type_info": "Text"
+      },
+      {
+        "name": "content_set_created?: i64",
+        "ordinal": 22,
+        "type_info": "Integer"
+      },
+      {
+        "name": "content_set_modified?: i64",
+        "ordinal": 23,
+        "type_info": "Integer"
+      },
+      {
+        "name": "link_kind!: String",
+        "ordinal": 24,
+        "type_info": "Null"
+      },
+      {
+        "name": "modrinth_project_id?: String",
+        "ordinal": 25,
+        "type_info": "Text"
+      },
+      {
+        "name": "modrinth_version_id?: String",
+        "ordinal": 26,
+        "type_info": "Text"
+      },
+      {
+        "name": "server_project_id?: String",
+        "ordinal": 27,
+        "type_info": "Text"
+      },
+      {
+        "name": "content_project_id?: String",
+        "ordinal": 28,
+        "type_info": "Text"
+      },
+      {
+        "name": "content_version_id?: String",
+        "ordinal": 29,
+        "type_info": "Text"
+      },
+      {
+        "name": "hosting_server_id?: String",
+        "ordinal": 30,
+        "type_info": "Text"
+      },
+      {
+        "name": "hosting_instance_ids?: String",
+        "ordinal": 31,
+        "type_info": "Null"
+      },
+      {
+        "name": "hosting_active_instance_id?: String",
+        "ordinal": 32,
+        "type_info": "Text"
+      },
+      {
+        "name": "shared_instance_id?: String",
+        "ordinal": 33,
+        "type_info": "Text"
+      },
+      {
+        "name": "shared_instance_role?: String",
+        "ordinal": 34,
+        "type_info": "Text"
+      },
+      {
+        "name": "shared_instance_manager_id?: String",
+        "ordinal": 35,
+        "type_info": "Text"
+      },
+      {
+        "name": "shared_instance_server_manager_name?: String",
+        "ordinal": 36,
+        "type_info": "Text"
+      },
+      {
+        "name": "shared_instance_server_manager_icon_url?: String",
+        "ordinal": 37,
+        "type_info": "Text"
+      },
+      {
+        "name": "shared_instance_linked_user_id?: String",
+        "ordinal": 38,
+        "type_info": "Text"
+      },
+      {
+        "name": "shared_sync_applied_update_id?: String",
+        "ordinal": 39,
+        "type_info": "Text"
+      },
+      {
+        "name": "shared_sync_latest_available_update_id?: String",
+        "ordinal": 40,
+        "type_info": "Text"
+      },
+      {
+        "name": "shared_sync_status?: String",
+        "ordinal": 41,
+        "type_info": "Text"
+      },
+      {
+        "name": "imported_name?: String",
+        "ordinal": 42,
+        "type_info": "Text"
+      },
+      {
+        "name": "imported_version_number?: String",
+        "ordinal": 43,
+        "type_info": "Text"
+      },
+      {
+        "name": "imported_filename?: String",
+        "ordinal": 44,
+        "type_info": "Text"
+      },
+      {
+        "name": "groups!: String",
+        "ordinal": 45,
+        "type_info": "Null"
+      },
+      {
+        "name": "launch_overrides?: String",
+        "ordinal": 46,
+        "type_info": "Null"
+      }
+    ],
+    "parameters": {
+      "Right": 1
+    },
+    "nullable": [
+      false,
+      false,
+      true,
+      false,
+      false,
+      false,
+      false,
+      true,
+      false,
+      false,
+      true,
+      false,
+      false,
+      false,
+      false,
+      false,
+      false,
+      false,
+      false,
+      true,
+      false,
+      true,
+      false,
+      false,
+      null,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      null,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      false,
+      true,
+      true,
+      true,
+      null,
+      null
+    ]
+  },
+  "hash": "88a0520cb21aaea25bf12a5ad07e7f0614e912494f850e77dfc502b1afe7c42a"
+}
diff --git a/packages/app-lib/.sqlx/query-aaf6e6a3de2dd9cb1c9db5dd9de2a6590b89c4f72449fdd34a7f140e2a11bf04.json b/packages/app-lib/.sqlx/query-aaf6e6a3de2dd9cb1c9db5dd9de2a6590b89c4f72449fdd34a7f140e2a11bf04.json
new file mode 100644
index 000000000..0e3aa4541
--- /dev/null
+++ b/packages/app-lib/.sqlx/query-aaf6e6a3de2dd9cb1c9db5dd9de2a6590b89c4f72449fdd34a7f140e2a11bf04.json
@@ -0,0 +1,296 @@
+{
+  "db_name": "SQLite",
+  "query": "\n                SELECT\n                    i.id AS \"id!: String\",\n                    i.path AS \"path!: String\",\n                    i.applied_content_set_id AS \"applied_content_set_id?: String\",\n                    i.install_stage AS \"install_stage!: String\",\n                    i.launcher_feature_version AS \"launcher_feature_version!: String\",\n                    i.update_channel AS \"update_channel!: String\",\n                    i.name AS \"name!: String\",\n                    i.icon_path AS \"icon_path?: String\",\n                    i.created AS \"created!: i64\",\n                    i.modified AS \"modified!: i64\",\n                    i.last_played AS \"last_played?: i64\",\n                    i.submitted_time_played AS \"submitted_time_played!: i64\",\n                    i.recent_time_played AS \"recent_time_played!: i64\",\n                    cs.id AS \"content_set_id?: String\",\n                    cs.instance_id AS \"content_set_instance_id?: String\",\n                    cs.name AS \"content_set_name?: String\",\n                    cs.source_kind AS \"content_set_source_kind?: String\",\n                    cs.status AS \"content_set_status?: String\",\n                    cs.game_version AS \"content_set_game_version?: String\",\n                    cs.protocol_version AS \"content_set_protocol_version?: i64\",\n                    cs.loader AS \"content_set_loader?: String\",\n                    cs.loader_version AS \"content_set_loader_version?: String\",\n                    cs.created AS \"content_set_created?: i64\",\n                    cs.modified AS \"content_set_modified?: i64\",\n                    COALESCE(link.link_kind, 'unmanaged') AS \"link_kind!: String\",\n                    link.modrinth_project_id AS \"modrinth_project_id?: String\",\n                    link.modrinth_version_id AS \"modrinth_version_id?: String\",\n                    link.server_project_id AS \"server_project_id?: String\",\n                    link.content_project_id AS \"content_project_id?: String\",\n                    link.content_version_id AS \"content_version_id?: String\",\n                    link.hosting_server_id AS \"hosting_server_id?: String\",\n                    json(link.hosting_instance_ids) AS \"hosting_instance_ids?: String\",\n                    link.hosting_active_instance_id AS \"hosting_active_instance_id?: String\",\n                    link.shared_instance_id AS \"shared_instance_id?: String\",\n                    link.shared_instance_role AS \"shared_instance_role?: String\",\n                    link.shared_instance_manager_id AS \"shared_instance_manager_id?: String\",\n                    link.shared_instance_server_manager_name AS \"shared_instance_server_manager_name?: String\",\n                    link.shared_instance_server_manager_icon_url AS \"shared_instance_server_manager_icon_url?: String\",\n                    link.shared_instance_linked_user_id AS \"shared_instance_linked_user_id?: String\",\n                    sync.applied_update_id AS \"shared_sync_applied_update_id?: String\",\n                    sync.latest_available_update_id AS \"shared_sync_latest_available_update_id?: String\",\n                    sync.status AS \"shared_sync_status?: String\",\n                    link.imported_name AS \"imported_name?: String\",\n                    link.imported_version_number AS \"imported_version_number?: String\",\n                    link.imported_filename AS \"imported_filename?: String\",\n                    COALESCE((\n                        SELECT json_group_array(group_name)\n                        FROM (\n                            SELECT group_name\n                            FROM instance_groups\n                            WHERE instance_id = i.id\n                            ORDER BY group_name\n                        )\n                    ), '[]') AS \"groups!: String\",\n                    json(overrides.overrides) AS \"launch_overrides?: String\"\n                FROM instances i\n                LEFT JOIN instance_content_sets cs\n                    ON cs.id = i.applied_content_set_id\n                    AND cs.instance_id = i.id\n                LEFT JOIN instance_links link\n                    ON link.instance_id = i.id\n                LEFT JOIN instance_content_set_sync_state sync\n                    ON sync.content_set_id = cs.id\n                    AND sync.provider = 'shared_instance'\n                LEFT JOIN instance_launch_overrides overrides\n                    ON overrides.instance_id = i.id\n                WHERE 1 = ?",
+  "describe": {
+    "columns": [
+      {
+        "name": "id!: String",
+        "ordinal": 0,
+        "type_info": "Text"
+      },
+      {
+        "name": "path!: String",
+        "ordinal": 1,
+        "type_info": "Text"
+      },
+      {
+        "name": "applied_content_set_id?: String",
+        "ordinal": 2,
+        "type_info": "Text"
+      },
+      {
+        "name": "install_stage!: String",
+        "ordinal": 3,
+        "type_info": "Text"
+      },
+      {
+        "name": "launcher_feature_version!: String",
+        "ordinal": 4,
+        "type_info": "Text"
+      },
+      {
+        "name": "update_channel!: String",
+        "ordinal": 5,
+        "type_info": "Text"
+      },
+      {
+        "name": "name!: String",
+        "ordinal": 6,
+        "type_info": "Text"
+      },
+      {
+        "name": "icon_path?: String",
+        "ordinal": 7,
+        "type_info": "Text"
+      },
+      {
+        "name": "created!: i64",
+        "ordinal": 8,
+        "type_info": "Integer"
+      },
+      {
+        "name": "modified!: i64",
+        "ordinal": 9,
+        "type_info": "Integer"
+      },
+      {
+        "name": "last_played?: i64",
+        "ordinal": 10,
+        "type_info": "Integer"
+      },
+      {
+        "name": "submitted_time_played!: i64",
+        "ordinal": 11,
+        "type_info": "Integer"
+      },
+      {
+        "name": "recent_time_played!: i64",
+        "ordinal": 12,
+        "type_info": "Integer"
+      },
+      {
+        "name": "content_set_id?: String",
+        "ordinal": 13,
+        "type_info": "Text"
+      },
+      {
+        "name": "content_set_instance_id?: String",
+        "ordinal": 14,
+        "type_info": "Text"
+      },
+      {
+        "name": "content_set_name?: String",
+        "ordinal": 15,
+        "type_info": "Text"
+      },
+      {
+        "name": "content_set_source_kind?: String",
+        "ordinal": 16,
+        "type_info": "Text"
+      },
+      {
+        "name": "content_set_status?: String",
+        "ordinal": 17,
+        "type_info": "Text"
+      },
+      {
+        "name": "content_set_game_version?: String",
+        "ordinal": 18,
+        "type_info": "Text"
+      },
+      {
+        "name": "content_set_protocol_version?: i64",
+        "ordinal": 19,
+        "type_info": "Integer"
+      },
+      {
+        "name": "content_set_loader?: String",
+        "ordinal": 20,
+        "type_info": "Text"
+      },
+      {
+        "name": "content_set_loader_version?: String",
+        "ordinal": 21,
+        "type_info": "Text"
+      },
+      {
+        "name": "content_set_created?: i64",
+        "ordinal": 22,
+        "type_info": "Integer"
+      },
+      {
+        "name": "content_set_modified?: i64",
+        "ordinal": 23,
+        "type_info": "Integer"
+      },
+      {
+        "name": "link_kind!: String",
+        "ordinal": 24,
+        "type_info": "Text"
+      },
+      {
+        "name": "modrinth_project_id?: String",
+        "ordinal": 25,
+        "type_info": "Text"
+      },
+      {
+        "name": "modrinth_version_id?: String",
+        "ordinal": 26,
+        "type_info": "Text"
+      },
+      {
+        "name": "server_project_id?: String",
+        "ordinal": 27,
+        "type_info": "Text"
+      },
+      {
+        "name": "content_project_id?: String",
+        "ordinal": 28,
+        "type_info": "Text"
+      },
+      {
+        "name": "content_version_id?: String",
+        "ordinal": 29,
+        "type_info": "Text"
+      },
+      {
+        "name": "hosting_server_id?: String",
+        "ordinal": 30,
+        "type_info": "Text"
+      },
+      {
+        "name": "hosting_instance_ids?: String",
+        "ordinal": 31,
+        "type_info": "Null"
+      },
+      {
+        "name": "hosting_active_instance_id?: String",
+        "ordinal": 32,
+        "type_info": "Text"
+      },
+      {
+        "name": "shared_instance_id?: String",
+        "ordinal": 33,
+        "type_info": "Text"
+      },
+      {
+        "name": "shared_instance_role?: String",
+        "ordinal": 34,
+        "type_info": "Text"
+      },
+      {
+        "name": "shared_instance_manager_id?: String",
+        "ordinal": 35,
+        "type_info": "Text"
+      },
+      {
+        "name": "shared_instance_server_manager_name?: String",
+        "ordinal": 36,
+        "type_info": "Text"
+      },
+      {
+        "name": "shared_instance_server_manager_icon_url?: String",
+        "ordinal": 37,
+        "type_info": "Text"
+      },
+      {
+        "name": "shared_instance_linked_user_id?: String",
+        "ordinal": 38,
+        "type_info": "Text"
+      },
+      {
+        "name": "shared_sync_applied_update_id?: String",
+        "ordinal": 39,
+        "type_info": "Text"
+      },
+      {
+        "name": "shared_sync_latest_available_update_id?: String",
+        "ordinal": 40,
+        "type_info": "Text"
+      },
+      {
+        "name": "shared_sync_status?: String",
+        "ordinal": 41,
+        "type_info": "Text"
+      },
+      {
+        "name": "imported_name?: String",
+        "ordinal": 42,
+        "type_info": "Text"
+      },
+      {
+        "name": "imported_version_number?: String",
+        "ordinal": 43,
+        "type_info": "Text"
+      },
+      {
+        "name": "imported_filename?: String",
+        "ordinal": 44,
+        "type_info": "Text"
+      },
+      {
+        "name": "groups!: String",
+        "ordinal": 45,
+        "type_info": "Text"
+      },
+      {
+        "name": "launch_overrides?: String",
+        "ordinal": 46,
+        "type_info": "Null"
+      }
+    ],
+    "parameters": {
+      "Right": 1
+    },
+    "nullable": [
+      false,
+      false,
+      true,
+      false,
+      false,
+      false,
+      false,
+      true,
+      false,
+      false,
+      true,
+      false,
+      false,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      false,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      null,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      true,
+      false,
+      null
+    ]
+  },
+  "hash": "aaf6e6a3de2dd9cb1c9db5dd9de2a6590b89c4f72449fdd34a7f140e2a11bf04"
+}
diff --git a/packages/app-lib/.sqlx/query-b9ce6ff27e3b4d62ff0ae2bed0d00cae0b4b758c0674ac81659ee9d86667f19c.json b/packages/app-lib/.sqlx/query-b9ce6ff27e3b4d62ff0ae2bed0d00cae0b4b758c0674ac81659ee9d86667f19c.json
new file mode 100644
index 000000000..1f5b4f5af
--- /dev/null
+++ b/packages/app-lib/.sqlx/query-b9ce6ff27e3b4d62ff0ae2bed0d00cae0b4b758c0674ac81659ee9d86667f19c.json
@@ -0,0 +1,12 @@
+{
+  "db_name": "SQLite",
+  "query": "\n\t\tINSERT INTO instance_links (\n\t\t\tinstance_id,\n\t\t\tlink_kind,\n\t\t\tshared_instance_id,\n\t\t\tshared_instance_role,\n\t\t\tshared_instance_manager_id,\n\t\t\tshared_instance_server_manager_name,\n\t\t\tshared_instance_server_manager_icon_url,\n\t\t\tshared_instance_linked_user_id\n\t\t)\n\t\tVALUES (?, 'unmanaged', ?, ?, ?, ?, ?, ?)\n\t\tON CONFLICT (instance_id) DO UPDATE SET\n\t\t\tlink_kind = CASE\n\t\t\t\tWHEN excluded.shared_instance_id IS NULL\n\t\t\t\t\tAND instance_links.link_kind = 'shared_instance'\n\t\t\t\t\tTHEN 'unmanaged'\n\t\t\t\tELSE instance_links.link_kind\n\t\t\tEND,\n\t\t\tshared_instance_id = excluded.shared_instance_id,\n\t\t\tshared_instance_role = excluded.shared_instance_role,\n\t\t\tshared_instance_manager_id = excluded.shared_instance_manager_id,\n\t\t\tshared_instance_server_manager_name = excluded.shared_instance_server_manager_name,\n\t\t\tshared_instance_server_manager_icon_url = excluded.shared_instance_server_manager_icon_url,\n\t\t\tshared_instance_linked_user_id = excluded.shared_instance_linked_user_id\n\t\t",
+  "describe": {
+    "columns": [],
+    "parameters": {
+      "Right": 7
+    },
+    "nullable": []
+  },
+  "hash": "b9ce6ff27e3b4d62ff0ae2bed0d00cae0b4b758c0674ac81659ee9d86667f19c"
+}
diff --git a/packages/app-lib/.sqlx/query-bcc93c48dd3c9ccbe196cfbe27e36b774d1b506e6cf5f2ab38469e9e3e6c9b6d.json b/packages/app-lib/.sqlx/query-bcc93c48dd3c9ccbe196cfbe27e36b774d1b506e6cf5f2ab38469e9e3e6c9b6d.json
deleted file mode 100644
index 3b13db920..000000000
--- a/packages/app-lib/.sqlx/query-bcc93c48dd3c9ccbe196cfbe27e36b774d1b506e6cf5f2ab38469e9e3e6c9b6d.json
+++ /dev/null
@@ -1,248 +0,0 @@
-{
-  "db_name": "SQLite",
-  "query": "\n        SELECT\n            i.id AS \"id!: String\",\n            i.path AS \"path!: String\",\n            i.applied_content_set_id AS \"applied_content_set_id?: String\",\n            i.install_stage AS \"install_stage!: String\",\n            i.launcher_feature_version AS \"launcher_feature_version!: String\",\n            i.update_channel AS \"update_channel!: String\",\n            i.name AS \"name!: String\",\n            i.icon_path AS \"icon_path?: String\",\n            i.created AS \"created!: i64\",\n            i.modified AS \"modified!: i64\",\n            i.last_played AS \"last_played?: i64\",\n            i.submitted_time_played AS \"submitted_time_played!: i64\",\n            i.recent_time_played AS \"recent_time_played!: i64\",\n            cs.id AS \"content_set_id?: String\",\n            cs.instance_id AS \"content_set_instance_id?: String\",\n            cs.name AS \"content_set_name?: String\",\n            cs.source_kind AS \"content_set_source_kind?: String\",\n            cs.status AS \"content_set_status?: String\",\n            cs.game_version AS \"content_set_game_version?: String\",\n            cs.protocol_version AS \"content_set_protocol_version?: i64\",\n            cs.loader AS \"content_set_loader?: String\",\n            cs.loader_version AS \"content_set_loader_version?: String\",\n            cs.created AS \"content_set_created?: i64\",\n            cs.modified AS \"content_set_modified?: i64\",\n            COALESCE(link.link_kind, 'unmanaged') AS \"link_kind!: String\",\n            link.modrinth_project_id AS \"modrinth_project_id?: String\",\n            link.modrinth_version_id AS \"modrinth_version_id?: String\",\n            link.server_project_id AS \"server_project_id?: String\",\n            link.content_project_id AS \"content_project_id?: String\",\n            link.content_version_id AS \"content_version_id?: String\",\n            link.hosting_server_id AS \"hosting_server_id?: String\",\n            json(link.hosting_instance_ids) AS \"hosting_instance_ids?: String\",\n            link.hosting_active_instance_id AS \"hosting_active_instance_id?: String\",\n            link.shared_instance_id AS \"shared_instance_id?: String\",\n            link.imported_name AS \"imported_name?: String\",\n            link.imported_version_number AS \"imported_version_number?: String\",\n            link.imported_filename AS \"imported_filename?: String\",\n            COALESCE((\n                SELECT json_group_array(group_name)\n                FROM (\n                    SELECT group_name\n                    FROM instance_groups\n                    WHERE instance_id = i.id\n                    ORDER BY group_name\n                )\n            ), '[]') AS \"groups!: String\",\n            json(overrides.overrides) AS \"launch_overrides?: String\"\n        FROM instances i\n        LEFT JOIN instance_content_sets cs\n            ON cs.id = i.applied_content_set_id\n            AND cs.instance_id = i.id\n        LEFT JOIN instance_links link\n            ON link.instance_id = i.id\n        LEFT JOIN instance_launch_overrides overrides\n            ON overrides.instance_id = i.id\n        WHERE i.id = ?\n        ",
-  "describe": {
-    "columns": [
-      {
-        "name": "id!: String",
-        "ordinal": 0,
-        "type_info": "Text"
-      },
-      {
-        "name": "path!: String",
-        "ordinal": 1,
-        "type_info": "Text"
-      },
-      {
-        "name": "applied_content_set_id?: String",
-        "ordinal": 2,
-        "type_info": "Text"
-      },
-      {
-        "name": "install_stage!: String",
-        "ordinal": 3,
-        "type_info": "Text"
-      },
-      {
-        "name": "launcher_feature_version!: String",
-        "ordinal": 4,
-        "type_info": "Text"
-      },
-      {
-        "name": "update_channel!: String",
-        "ordinal": 5,
-        "type_info": "Text"
-      },
-      {
-        "name": "name!: String",
-        "ordinal": 6,
-        "type_info": "Text"
-      },
-      {
-        "name": "icon_path?: String",
-        "ordinal": 7,
-        "type_info": "Text"
-      },
-      {
-        "name": "created!: i64",
-        "ordinal": 8,
-        "type_info": "Integer"
-      },
-      {
-        "name": "modified!: i64",
-        "ordinal": 9,
-        "type_info": "Integer"
-      },
-      {
-        "name": "last_played?: i64",
-        "ordinal": 10,
-        "type_info": "Integer"
-      },
-      {
-        "name": "submitted_time_played!: i64",
-        "ordinal": 11,
-        "type_info": "Integer"
-      },
-      {
-        "name": "recent_time_played!: i64",
-        "ordinal": 12,
-        "type_info": "Integer"
-      },
-      {
-        "name": "content_set_id?: String",
-        "ordinal": 13,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_set_instance_id?: String",
-        "ordinal": 14,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_set_name?: String",
-        "ordinal": 15,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_set_source_kind?: String",
-        "ordinal": 16,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_set_status?: String",
-        "ordinal": 17,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_set_game_version?: String",
-        "ordinal": 18,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_set_protocol_version?: i64",
-        "ordinal": 19,
-        "type_info": "Integer"
-      },
-      {
-        "name": "content_set_loader?: String",
-        "ordinal": 20,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_set_loader_version?: String",
-        "ordinal": 21,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_set_created?: i64",
-        "ordinal": 22,
-        "type_info": "Integer"
-      },
-      {
-        "name": "content_set_modified?: i64",
-        "ordinal": 23,
-        "type_info": "Integer"
-      },
-      {
-        "name": "link_kind!: String",
-        "ordinal": 24,
-        "type_info": "Null"
-      },
-      {
-        "name": "modrinth_project_id?: String",
-        "ordinal": 25,
-        "type_info": "Text"
-      },
-      {
-        "name": "modrinth_version_id?: String",
-        "ordinal": 26,
-        "type_info": "Text"
-      },
-      {
-        "name": "server_project_id?: String",
-        "ordinal": 27,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_project_id?: String",
-        "ordinal": 28,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_version_id?: String",
-        "ordinal": 29,
-        "type_info": "Text"
-      },
-      {
-        "name": "hosting_server_id?: String",
-        "ordinal": 30,
-        "type_info": "Text"
-      },
-      {
-        "name": "hosting_instance_ids?: String",
-        "ordinal": 31,
-        "type_info": "Null"
-      },
-      {
-        "name": "hosting_active_instance_id?: String",
-        "ordinal": 32,
-        "type_info": "Text"
-      },
-      {
-        "name": "shared_instance_id?: String",
-        "ordinal": 33,
-        "type_info": "Text"
-      },
-      {
-        "name": "imported_name?: String",
-        "ordinal": 34,
-        "type_info": "Text"
-      },
-      {
-        "name": "imported_version_number?: String",
-        "ordinal": 35,
-        "type_info": "Text"
-      },
-      {
-        "name": "imported_filename?: String",
-        "ordinal": 36,
-        "type_info": "Text"
-      },
-      {
-        "name": "groups!: String",
-        "ordinal": 37,
-        "type_info": "Null"
-      },
-      {
-        "name": "launch_overrides?: String",
-        "ordinal": 38,
-        "type_info": "Null"
-      }
-    ],
-    "parameters": {
-      "Right": 1
-    },
-    "nullable": [
-      false,
-      false,
-      true,
-      false,
-      false,
-      false,
-      false,
-      true,
-      false,
-      false,
-      true,
-      false,
-      false,
-      false,
-      false,
-      false,
-      false,
-      false,
-      false,
-      true,
-      false,
-      true,
-      false,
-      false,
-      null,
-      true,
-      true,
-      true,
-      true,
-      true,
-      true,
-      null,
-      true,
-      true,
-      true,
-      true,
-      true,
-      null,
-      null
-    ]
-  },
-  "hash": "bcc93c48dd3c9ccbe196cfbe27e36b774d1b506e6cf5f2ab38469e9e3e6c9b6d"
-}
diff --git a/packages/app-lib/.sqlx/query-becbba7c6dfb4b22520cc1887718af544c08d3e274a930a68daf3e94e3612243.json b/packages/app-lib/.sqlx/query-becbba7c6dfb4b22520cc1887718af544c08d3e274a930a68daf3e94e3612243.json
new file mode 100644
index 000000000..809392531
--- /dev/null
+++ b/packages/app-lib/.sqlx/query-becbba7c6dfb4b22520cc1887718af544c08d3e274a930a68daf3e94e3612243.json
@@ -0,0 +1,12 @@
+{
+  "db_name": "SQLite",
+  "query": "\n\t\tDELETE FROM instance_content_set_sync_state\n\t\tWHERE content_set_id = ?\n\t\t",
+  "describe": {
+    "columns": [],
+    "parameters": {
+      "Right": 1
+    },
+    "nullable": []
+  },
+  "hash": "becbba7c6dfb4b22520cc1887718af544c08d3e274a930a68daf3e94e3612243"
+}
diff --git a/packages/app-lib/.sqlx/query-bf813910a5b0db8563a689088eedf95c67b5ceda04aa1b0eb782b581e23ec06b.json b/packages/app-lib/.sqlx/query-bf813910a5b0db8563a689088eedf95c67b5ceda04aa1b0eb782b581e23ec06b.json
new file mode 100644
index 000000000..c26399515
--- /dev/null
+++ b/packages/app-lib/.sqlx/query-bf813910a5b0db8563a689088eedf95c67b5ceda04aa1b0eb782b581e23ec06b.json
@@ -0,0 +1,12 @@
+{
+  "db_name": "SQLite",
+  "query": "\n\t\tINSERT INTO instance_links (\n\t\t\tinstance_id,\n\t\t\tlink_kind,\n\t\t\tmodrinth_project_id,\n\t\t\tmodrinth_version_id,\n\t\t\tserver_project_id,\n\t\t\tcontent_project_id,\n\t\t\tcontent_version_id,\n\t\t\thosting_server_id,\n\t\t\thosting_instance_ids,\n\t\t\thosting_active_instance_id,\n\t\t\timported_name,\n\t\t\timported_version_number,\n\t\t\timported_filename\n\t\t)\n\t\tVALUES (?, ?, ?, ?, ?, ?, ?, ?, jsonb(?), ?, ?, ?, ?)\n\t\tON CONFLICT (instance_id) DO UPDATE SET\n\t\t\tlink_kind = excluded.link_kind,\n\t\t\tmodrinth_project_id = excluded.modrinth_project_id,\n\t\t\tmodrinth_version_id = excluded.modrinth_version_id,\n\t\t\tserver_project_id = excluded.server_project_id,\n\t\t\tcontent_project_id = excluded.content_project_id,\n\t\t\tcontent_version_id = excluded.content_version_id,\n\t\t\thosting_server_id = excluded.hosting_server_id,\n\t\t\thosting_instance_ids = excluded.hosting_instance_ids,\n\t\t\thosting_active_instance_id = excluded.hosting_active_instance_id,\n\t\t\timported_name = excluded.imported_name,\n\t\t\timported_version_number = excluded.imported_version_number,\n\t\t\timported_filename = excluded.imported_filename\n\t\t",
+  "describe": {
+    "columns": [],
+    "parameters": {
+      "Right": 13
+    },
+    "nullable": []
+  },
+  "hash": "bf813910a5b0db8563a689088eedf95c67b5ceda04aa1b0eb782b581e23ec06b"
+}
diff --git a/packages/app-lib/.sqlx/query-e53cd252e1e9eebcb3fb9714d7b5ee588e751fdc3f18c48bc4cfd94504c37306.json b/packages/app-lib/.sqlx/query-e53cd252e1e9eebcb3fb9714d7b5ee588e751fdc3f18c48bc4cfd94504c37306.json
deleted file mode 100644
index def78302d..000000000
--- a/packages/app-lib/.sqlx/query-e53cd252e1e9eebcb3fb9714d7b5ee588e751fdc3f18c48bc4cfd94504c37306.json
+++ /dev/null
@@ -1,248 +0,0 @@
-{
-  "db_name": "SQLite",
-  "query": "\n        WITH requested AS (\n            SELECT value AS id, key AS ord\n            FROM json_each(?)\n        )\n        SELECT\n            i.id AS \"id!: String\",\n            i.path AS \"path!: String\",\n            i.applied_content_set_id AS \"applied_content_set_id?: String\",\n            i.install_stage AS \"install_stage!: String\",\n            i.launcher_feature_version AS \"launcher_feature_version!: String\",\n            i.update_channel AS \"update_channel!: String\",\n            i.name AS \"name!: String\",\n            i.icon_path AS \"icon_path?: String\",\n            i.created AS \"created!: i64\",\n            i.modified AS \"modified!: i64\",\n            i.last_played AS \"last_played?: i64\",\n            i.submitted_time_played AS \"submitted_time_played!: i64\",\n            i.recent_time_played AS \"recent_time_played!: i64\",\n            cs.id AS \"content_set_id?: String\",\n            cs.instance_id AS \"content_set_instance_id?: String\",\n            cs.name AS \"content_set_name?: String\",\n            cs.source_kind AS \"content_set_source_kind?: String\",\n            cs.status AS \"content_set_status?: String\",\n            cs.game_version AS \"content_set_game_version?: String\",\n            cs.protocol_version AS \"content_set_protocol_version?: i64\",\n            cs.loader AS \"content_set_loader?: String\",\n            cs.loader_version AS \"content_set_loader_version?: String\",\n            cs.created AS \"content_set_created?: i64\",\n            cs.modified AS \"content_set_modified?: i64\",\n            COALESCE(link.link_kind, 'unmanaged') AS \"link_kind!: String\",\n            link.modrinth_project_id AS \"modrinth_project_id?: String\",\n            link.modrinth_version_id AS \"modrinth_version_id?: String\",\n            link.server_project_id AS \"server_project_id?: String\",\n            link.content_project_id AS \"content_project_id?: String\",\n            link.content_version_id AS \"content_version_id?: String\",\n            link.hosting_server_id AS \"hosting_server_id?: String\",\n            json(link.hosting_instance_ids) AS \"hosting_instance_ids?: String\",\n            link.hosting_active_instance_id AS \"hosting_active_instance_id?: String\",\n            link.shared_instance_id AS \"shared_instance_id?: String\",\n            link.imported_name AS \"imported_name?: String\",\n            link.imported_version_number AS \"imported_version_number?: String\",\n            link.imported_filename AS \"imported_filename?: String\",\n            COALESCE((\n                SELECT json_group_array(group_name)\n                FROM (\n                    SELECT group_name\n                    FROM instance_groups\n                    WHERE instance_id = i.id\n                    ORDER BY group_name\n                )\n            ), '[]') AS \"groups!: String\",\n            json(overrides.overrides) AS \"launch_overrides?: String\"\n        FROM requested\n        INNER JOIN instances i\n            ON i.id = requested.id\n        LEFT JOIN instance_content_sets cs\n            ON cs.id = i.applied_content_set_id\n            AND cs.instance_id = i.id\n        LEFT JOIN instance_links link\n            ON link.instance_id = i.id\n        LEFT JOIN instance_launch_overrides overrides\n            ON overrides.instance_id = i.id\n        ORDER BY requested.ord\n        ",
-  "describe": {
-    "columns": [
-      {
-        "name": "id!: String",
-        "ordinal": 0,
-        "type_info": "Text"
-      },
-      {
-        "name": "path!: String",
-        "ordinal": 1,
-        "type_info": "Text"
-      },
-      {
-        "name": "applied_content_set_id?: String",
-        "ordinal": 2,
-        "type_info": "Text"
-      },
-      {
-        "name": "install_stage!: String",
-        "ordinal": 3,
-        "type_info": "Text"
-      },
-      {
-        "name": "launcher_feature_version!: String",
-        "ordinal": 4,
-        "type_info": "Text"
-      },
-      {
-        "name": "update_channel!: String",
-        "ordinal": 5,
-        "type_info": "Text"
-      },
-      {
-        "name": "name!: String",
-        "ordinal": 6,
-        "type_info": "Text"
-      },
-      {
-        "name": "icon_path?: String",
-        "ordinal": 7,
-        "type_info": "Text"
-      },
-      {
-        "name": "created!: i64",
-        "ordinal": 8,
-        "type_info": "Integer"
-      },
-      {
-        "name": "modified!: i64",
-        "ordinal": 9,
-        "type_info": "Integer"
-      },
-      {
-        "name": "last_played?: i64",
-        "ordinal": 10,
-        "type_info": "Integer"
-      },
-      {
-        "name": "submitted_time_played!: i64",
-        "ordinal": 11,
-        "type_info": "Integer"
-      },
-      {
-        "name": "recent_time_played!: i64",
-        "ordinal": 12,
-        "type_info": "Integer"
-      },
-      {
-        "name": "content_set_id?: String",
-        "ordinal": 13,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_set_instance_id?: String",
-        "ordinal": 14,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_set_name?: String",
-        "ordinal": 15,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_set_source_kind?: String",
-        "ordinal": 16,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_set_status?: String",
-        "ordinal": 17,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_set_game_version?: String",
-        "ordinal": 18,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_set_protocol_version?: i64",
-        "ordinal": 19,
-        "type_info": "Integer"
-      },
-      {
-        "name": "content_set_loader?: String",
-        "ordinal": 20,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_set_loader_version?: String",
-        "ordinal": 21,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_set_created?: i64",
-        "ordinal": 22,
-        "type_info": "Integer"
-      },
-      {
-        "name": "content_set_modified?: i64",
-        "ordinal": 23,
-        "type_info": "Integer"
-      },
-      {
-        "name": "link_kind!: String",
-        "ordinal": 24,
-        "type_info": "Null"
-      },
-      {
-        "name": "modrinth_project_id?: String",
-        "ordinal": 25,
-        "type_info": "Text"
-      },
-      {
-        "name": "modrinth_version_id?: String",
-        "ordinal": 26,
-        "type_info": "Text"
-      },
-      {
-        "name": "server_project_id?: String",
-        "ordinal": 27,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_project_id?: String",
-        "ordinal": 28,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_version_id?: String",
-        "ordinal": 29,
-        "type_info": "Text"
-      },
-      {
-        "name": "hosting_server_id?: String",
-        "ordinal": 30,
-        "type_info": "Text"
-      },
-      {
-        "name": "hosting_instance_ids?: String",
-        "ordinal": 31,
-        "type_info": "Null"
-      },
-      {
-        "name": "hosting_active_instance_id?: String",
-        "ordinal": 32,
-        "type_info": "Text"
-      },
-      {
-        "name": "shared_instance_id?: String",
-        "ordinal": 33,
-        "type_info": "Text"
-      },
-      {
-        "name": "imported_name?: String",
-        "ordinal": 34,
-        "type_info": "Text"
-      },
-      {
-        "name": "imported_version_number?: String",
-        "ordinal": 35,
-        "type_info": "Text"
-      },
-      {
-        "name": "imported_filename?: String",
-        "ordinal": 36,
-        "type_info": "Text"
-      },
-      {
-        "name": "groups!: String",
-        "ordinal": 37,
-        "type_info": "Null"
-      },
-      {
-        "name": "launch_overrides?: String",
-        "ordinal": 38,
-        "type_info": "Null"
-      }
-    ],
-    "parameters": {
-      "Right": 1
-    },
-    "nullable": [
-      false,
-      false,
-      true,
-      false,
-      false,
-      false,
-      false,
-      true,
-      false,
-      false,
-      true,
-      false,
-      false,
-      false,
-      false,
-      false,
-      false,
-      false,
-      false,
-      true,
-      false,
-      true,
-      false,
-      false,
-      null,
-      true,
-      true,
-      true,
-      true,
-      true,
-      true,
-      null,
-      true,
-      true,
-      true,
-      true,
-      true,
-      null,
-      null
-    ]
-  },
-  "hash": "e53cd252e1e9eebcb3fb9714d7b5ee588e751fdc3f18c48bc4cfd94504c37306"
-}
diff --git a/packages/app-lib/.sqlx/query-eca3e44d4ba62e218289fa058dd563cebedb6b8add6c936c551a857783645ff8.json b/packages/app-lib/.sqlx/query-eca3e44d4ba62e218289fa058dd563cebedb6b8add6c936c551a857783645ff8.json
deleted file mode 100644
index 1086063a2..000000000
--- a/packages/app-lib/.sqlx/query-eca3e44d4ba62e218289fa058dd563cebedb6b8add6c936c551a857783645ff8.json
+++ /dev/null
@@ -1,12 +0,0 @@
-{
-  "db_name": "SQLite",
-  "query": "\n\t\tINSERT INTO instance_links (\n\t\t\tinstance_id,\n\t\t\tlink_kind,\n\t\t\tmodrinth_project_id,\n\t\t\tmodrinth_version_id,\n\t\t\tserver_project_id,\n\t\t\tcontent_project_id,\n\t\t\tcontent_version_id,\n\t\t\thosting_server_id,\n\t\t\thosting_instance_ids,\n\t\t\thosting_active_instance_id,\n\t\t\tshared_instance_id,\n\t\t\timported_name,\n\t\t\timported_version_number,\n\t\t\timported_filename\n\t\t)\n\t\tVALUES (?, ?, ?, ?, ?, ?, ?, ?, jsonb(?), ?, ?, ?, ?, ?)\n\t\tON CONFLICT (instance_id) DO UPDATE SET\n\t\t\tlink_kind = excluded.link_kind,\n\t\t\tmodrinth_project_id = excluded.modrinth_project_id,\n\t\t\tmodrinth_version_id = excluded.modrinth_version_id,\n\t\t\tserver_project_id = excluded.server_project_id,\n\t\t\tcontent_project_id = excluded.content_project_id,\n\t\t\tcontent_version_id = excluded.content_version_id,\n\t\t\thosting_server_id = excluded.hosting_server_id,\n\t\t\thosting_instance_ids = excluded.hosting_instance_ids,\n\t\t\thosting_active_instance_id = excluded.hosting_active_instance_id,\n\t\t\tshared_instance_id = excluded.shared_instance_id,\n\t\t\timported_name = excluded.imported_name,\n\t\t\timported_version_number = excluded.imported_version_number,\n\t\t\timported_filename = excluded.imported_filename\n\t\t",
-  "describe": {
-    "columns": [],
-    "parameters": {
-      "Right": 14
-    },
-    "nullable": []
-  },
-  "hash": "eca3e44d4ba62e218289fa058dd563cebedb6b8add6c936c551a857783645ff8"
-}
diff --git a/packages/app-lib/.sqlx/query-f0d8d4f98f7fdf3d656a7811f232d429a2cc73bc2c752594fcad7da19967ff7b.json b/packages/app-lib/.sqlx/query-f0d8d4f98f7fdf3d656a7811f232d429a2cc73bc2c752594fcad7da19967ff7b.json
deleted file mode 100644
index 4fcd16770..000000000
--- a/packages/app-lib/.sqlx/query-f0d8d4f98f7fdf3d656a7811f232d429a2cc73bc2c752594fcad7da19967ff7b.json
+++ /dev/null
@@ -1,248 +0,0 @@
-{
-  "db_name": "SQLite",
-  "query": "\n        SELECT\n            i.id AS \"id!: String\",\n            i.path AS \"path!: String\",\n            i.applied_content_set_id AS \"applied_content_set_id?: String\",\n            i.install_stage AS \"install_stage!: String\",\n            i.launcher_feature_version AS \"launcher_feature_version!: String\",\n            i.update_channel AS \"update_channel!: String\",\n            i.name AS \"name!: String\",\n            i.icon_path AS \"icon_path?: String\",\n            i.created AS \"created!: i64\",\n            i.modified AS \"modified!: i64\",\n            i.last_played AS \"last_played?: i64\",\n            i.submitted_time_played AS \"submitted_time_played!: i64\",\n            i.recent_time_played AS \"recent_time_played!: i64\",\n            cs.id AS \"content_set_id?: String\",\n            cs.instance_id AS \"content_set_instance_id?: String\",\n            cs.name AS \"content_set_name?: String\",\n            cs.source_kind AS \"content_set_source_kind?: String\",\n            cs.status AS \"content_set_status?: String\",\n            cs.game_version AS \"content_set_game_version?: String\",\n            cs.protocol_version AS \"content_set_protocol_version?: i64\",\n            cs.loader AS \"content_set_loader?: String\",\n            cs.loader_version AS \"content_set_loader_version?: String\",\n            cs.created AS \"content_set_created?: i64\",\n            cs.modified AS \"content_set_modified?: i64\",\n            COALESCE(link.link_kind, 'unmanaged') AS \"link_kind!: String\",\n            link.modrinth_project_id AS \"modrinth_project_id?: String\",\n            link.modrinth_version_id AS \"modrinth_version_id?: String\",\n            link.server_project_id AS \"server_project_id?: String\",\n            link.content_project_id AS \"content_project_id?: String\",\n            link.content_version_id AS \"content_version_id?: String\",\n            link.hosting_server_id AS \"hosting_server_id?: String\",\n            json(link.hosting_instance_ids) AS \"hosting_instance_ids?: String\",\n            link.hosting_active_instance_id AS \"hosting_active_instance_id?: String\",\n            link.shared_instance_id AS \"shared_instance_id?: String\",\n            link.imported_name AS \"imported_name?: String\",\n            link.imported_version_number AS \"imported_version_number?: String\",\n            link.imported_filename AS \"imported_filename?: String\",\n            COALESCE((\n                SELECT json_group_array(group_name)\n                FROM (\n                    SELECT group_name\n                    FROM instance_groups\n                    WHERE instance_id = i.id\n                    ORDER BY group_name\n                )\n            ), '[]') AS \"groups!: String\",\n            json(overrides.overrides) AS \"launch_overrides?: String\"\n        FROM instances i\n        LEFT JOIN instance_content_sets cs\n            ON cs.id = i.applied_content_set_id\n            AND cs.instance_id = i.id\n        LEFT JOIN instance_links link\n            ON link.instance_id = i.id\n        LEFT JOIN instance_launch_overrides overrides\n            ON overrides.instance_id = i.id\n        ",
-  "describe": {
-    "columns": [
-      {
-        "name": "id!: String",
-        "ordinal": 0,
-        "type_info": "Text"
-      },
-      {
-        "name": "path!: String",
-        "ordinal": 1,
-        "type_info": "Text"
-      },
-      {
-        "name": "applied_content_set_id?: String",
-        "ordinal": 2,
-        "type_info": "Text"
-      },
-      {
-        "name": "install_stage!: String",
-        "ordinal": 3,
-        "type_info": "Text"
-      },
-      {
-        "name": "launcher_feature_version!: String",
-        "ordinal": 4,
-        "type_info": "Text"
-      },
-      {
-        "name": "update_channel!: String",
-        "ordinal": 5,
-        "type_info": "Text"
-      },
-      {
-        "name": "name!: String",
-        "ordinal": 6,
-        "type_info": "Text"
-      },
-      {
-        "name": "icon_path?: String",
-        "ordinal": 7,
-        "type_info": "Text"
-      },
-      {
-        "name": "created!: i64",
-        "ordinal": 8,
-        "type_info": "Integer"
-      },
-      {
-        "name": "modified!: i64",
-        "ordinal": 9,
-        "type_info": "Integer"
-      },
-      {
-        "name": "last_played?: i64",
-        "ordinal": 10,
-        "type_info": "Integer"
-      },
-      {
-        "name": "submitted_time_played!: i64",
-        "ordinal": 11,
-        "type_info": "Integer"
-      },
-      {
-        "name": "recent_time_played!: i64",
-        "ordinal": 12,
-        "type_info": "Integer"
-      },
-      {
-        "name": "content_set_id?: String",
-        "ordinal": 13,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_set_instance_id?: String",
-        "ordinal": 14,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_set_name?: String",
-        "ordinal": 15,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_set_source_kind?: String",
-        "ordinal": 16,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_set_status?: String",
-        "ordinal": 17,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_set_game_version?: String",
-        "ordinal": 18,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_set_protocol_version?: i64",
-        "ordinal": 19,
-        "type_info": "Integer"
-      },
-      {
-        "name": "content_set_loader?: String",
-        "ordinal": 20,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_set_loader_version?: String",
-        "ordinal": 21,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_set_created?: i64",
-        "ordinal": 22,
-        "type_info": "Integer"
-      },
-      {
-        "name": "content_set_modified?: i64",
-        "ordinal": 23,
-        "type_info": "Integer"
-      },
-      {
-        "name": "link_kind!: String",
-        "ordinal": 24,
-        "type_info": "Text"
-      },
-      {
-        "name": "modrinth_project_id?: String",
-        "ordinal": 25,
-        "type_info": "Text"
-      },
-      {
-        "name": "modrinth_version_id?: String",
-        "ordinal": 26,
-        "type_info": "Text"
-      },
-      {
-        "name": "server_project_id?: String",
-        "ordinal": 27,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_project_id?: String",
-        "ordinal": 28,
-        "type_info": "Text"
-      },
-      {
-        "name": "content_version_id?: String",
-        "ordinal": 29,
-        "type_info": "Text"
-      },
-      {
-        "name": "hosting_server_id?: String",
-        "ordinal": 30,
-        "type_info": "Text"
-      },
-      {
-        "name": "hosting_instance_ids?: String",
-        "ordinal": 31,
-        "type_info": "Null"
-      },
-      {
-        "name": "hosting_active_instance_id?: String",
-        "ordinal": 32,
-        "type_info": "Text"
-      },
-      {
-        "name": "shared_instance_id?: String",
-        "ordinal": 33,
-        "type_info": "Text"
-      },
-      {
-        "name": "imported_name?: String",
-        "ordinal": 34,
-        "type_info": "Text"
-      },
-      {
-        "name": "imported_version_number?: String",
-        "ordinal": 35,
-        "type_info": "Text"
-      },
-      {
-        "name": "imported_filename?: String",
-        "ordinal": 36,
-        "type_info": "Text"
-      },
-      {
-        "name": "groups!: String",
-        "ordinal": 37,
-        "type_info": "Text"
-      },
-      {
-        "name": "launch_overrides?: String",
-        "ordinal": 38,
-        "type_info": "Null"
-      }
-    ],
-    "parameters": {
-      "Right": 0
-    },
-    "nullable": [
-      false,
-      false,
-      true,
-      false,
-      false,
-      false,
-      false,
-      true,
-      false,
-      false,
-      true,
-      false,
-      false,
-      true,
-      true,
-      true,
-      true,
-      true,
-      true,
-      true,
-      true,
-      true,
-      true,
-      true,
-      false,
-      true,
-      true,
-      true,
-      true,
-      true,
-      true,
-      null,
-      true,
-      true,
-      true,
-      true,
-      true,
-      false,
-      null
-    ]
-  },
-  "hash": "f0d8d4f98f7fdf3d656a7811f232d429a2cc73bc2c752594fcad7da19967ff7b"
-}
diff --git a/packages/app-lib/migrations/20260630120000_shared-instance-role.sql b/packages/app-lib/migrations/20260630120000_shared-instance-role.sql
new file mode 100644
index 000000000..0ee944c28
--- /dev/null
+++ b/packages/app-lib/migrations/20260630120000_shared-instance-role.sql
@@ -0,0 +1,2 @@
+ALTER TABLE instance_links
+	ADD COLUMN shared_instance_role TEXT NULL;
diff --git a/packages/app-lib/migrations/20260707103000_shared-instance-manager.sql b/packages/app-lib/migrations/20260707103000_shared-instance-manager.sql
new file mode 100644
index 000000000..beadec3d2
--- /dev/null
+++ b/packages/app-lib/migrations/20260707103000_shared-instance-manager.sql
@@ -0,0 +1,2 @@
+ALTER TABLE instance_links
+	ADD COLUMN shared_instance_manager_id TEXT NULL;
diff --git a/packages/app-lib/migrations/20260707110000_shared-instance-linked-user.sql b/packages/app-lib/migrations/20260707110000_shared-instance-linked-user.sql
new file mode 100644
index 000000000..b4fa60ab5
--- /dev/null
+++ b/packages/app-lib/migrations/20260707110000_shared-instance-linked-user.sql
@@ -0,0 +1,2 @@
+ALTER TABLE instance_links
+	ADD COLUMN shared_instance_linked_user_id TEXT NULL;
diff --git a/packages/app-lib/migrations/20260709190000_shared-instance-server-manager.sql b/packages/app-lib/migrations/20260709190000_shared-instance-server-manager.sql
new file mode 100644
index 000000000..066d18f2f
--- /dev/null
+++ b/packages/app-lib/migrations/20260709190000_shared-instance-server-manager.sql
@@ -0,0 +1,5 @@
+ALTER TABLE instance_links
+	ADD COLUMN shared_instance_server_manager_name TEXT NULL;
+
+ALTER TABLE instance_links
+	ADD COLUMN shared_instance_server_manager_icon_url TEXT NULL;
diff --git a/packages/app-lib/migrations/20260723120000_quarantined-instances.sql b/packages/app-lib/migrations/20260723120000_quarantined-instances.sql
new file mode 100644
index 000000000..0fa1e1103
--- /dev/null
+++ b/packages/app-lib/migrations/20260723120000_quarantined-instances.sql
@@ -0,0 +1,4 @@
+CREATE TABLE instance_quarantines (
+	instance_id TEXT PRIMARY KEY NOT NULL,
+	FOREIGN KEY (instance_id) REFERENCES instances(id) ON DELETE CASCADE
+);
diff --git a/packages/app-lib/src/api/handler.rs b/packages/app-lib/src/api/handler.rs
index 8a5351c03..b35a0bf2b 100644
--- a/packages/app-lib/src/api/handler.rs
+++ b/packages/app-lib/src/api/handler.rs
@@ -30,6 +30,26 @@ pub async fn handle_url(sublink: &str) -> crate::Result<CommandPayload> {
         Some(("server", id)) => {
             CommandPayload::InstallServer { id: id.to_string() }
         }
+        // /share/{invite_id}
+        Some(("share", raw)) => {
+            let (raw, _) = raw.split_once('?').unwrap_or((raw, ""));
+
+            match decode(raw) {
+                Ok(decoded) => CommandPayload::InstallSharedInstanceInvite {
+                    invite_id: decoded.to_string(),
+                },
+                Err(e) => {
+                    emit_warning(&format!(
+                        "Invalid UTF-8 in shared instance invite path: {e}"
+                    ))
+                    .await?;
+                    return Err(crate::ErrorKind::InputError(format!(
+                        "Invalid UTF-8 in shared instance invite path: {e}"
+                    ))
+                    .into());
+                }
+            }
+        }
         // /launch/instance/{id}   -    Launches an instance
         Some(("launch", rest)) if rest.starts_with("instance/") => {
             let raw = rest.trim_start_matches("instance/");
@@ -93,7 +113,7 @@ pub async fn handle_url(sublink: &str) -> crate::Result<CommandPayload> {
 pub async fn parse_command(
     command_string: &str,
 ) -> crate::Result<CommandPayload> {
-    tracing::debug!("Parsing command: {}", &command_string);
+    tracing::debug!("Parsing external command");
 
     // modrinth://some-command
     // This occurs when following a web redirect link
diff --git a/packages/app-lib/src/api/instance.rs b/packages/app-lib/src/api/instance.rs
index bcaf873f8..ad30a0780 100644
--- a/packages/app-lib/src/api/instance.rs
+++ b/packages/app-lib/src/api/instance.rs
@@ -1,6 +1,7 @@
 //! Theseus instance management interface
 
 mod content;
+mod content_set_diff;
 mod export_mrpack;
 mod get;
 mod install;
@@ -8,6 +9,7 @@ mod lifecycle;
 mod paths;
 mod projects;
 mod run;
+mod shared;
 
 pub use self::content::{
     get_content_items, get_dependencies_as_content_items,
@@ -33,3 +35,24 @@ pub use self::projects::{
 pub use self::run::{
     QuickPlayType, kill, run, try_update_playtime_by_instance_id,
 };
+pub(crate) use self::shared::{
+    CONFIG_BUNDLE_FILE_TYPE, CONFIG_DIRECTORY, CONFIG_FILE_EXTENSIONS,
+    CONFIG_SYNC_ENABLED, MAX_CONFIG_BUNDLE_ENTRIES,
+    read_bounded_config_bundle_entry,
+};
+pub use self::shared::{
+    SharedInstanceExternalFilePreview, SharedInstanceInstallPreview,
+    SharedInstanceInviteInstallPreview, SharedInstanceInviteLink,
+    SharedInstanceJoinType, SharedInstancePublishPreview,
+    SharedInstanceUpdateDiff, SharedInstanceUpdateDiffType,
+    SharedInstanceUpdatePreview, SharedInstanceUser, SharedInstanceUsers,
+    accept_pending_shared_instance_invite,
+    accept_shared_instance_invite_for_install,
+    can_active_user_use_shared_instances, create_shared_instance_invite_link,
+    decline_pending_shared_instance_invite,
+    get_shared_instance_install_preview, get_shared_instance_publish_preview,
+    get_shared_instance_update_preview, get_shared_instance_users,
+    install_shared_instance, invite_shared_instance_users,
+    publish_shared_instance, remove_shared_instance_users,
+    unlink_shared_instance, unpublish_shared_instance, update_shared_instance,
+};
diff --git a/packages/app-lib/src/api/instance/content_set_diff.rs b/packages/app-lib/src/api/instance/content_set_diff.rs
new file mode 100644
index 000000000..57d1e9c17
--- /dev/null
+++ b/packages/app-lib/src/api/instance/content_set_diff.rs
@@ -0,0 +1,152 @@
+use crate::state::Version;
+use std::collections::{HashMap, HashSet};
+
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+pub(crate) enum ContentSetDiffKind {
+    Added,
+    Removed,
+    Updated,
+}
+
+#[derive(Clone, Debug)]
+pub(crate) enum ContentSetDiffEntry {
+    Project {
+        kind: ContentSetDiffKind,
+        project_id: String,
+        current_version_name: Option<String>,
+        new_version_name: Option<String>,
+        disabled: bool,
+    },
+    ExternalFile {
+        kind: ContentSetDiffKind,
+        file_name: String,
+        disabled: bool,
+    },
+}
+
+#[derive(Clone, Debug, Default)]
+pub(crate) struct ContentSetDiffOptions {
+    pub removed_disabled_project_ids: HashSet<String>,
+    pub removed_disabled_external_files: HashSet<String>,
+    pub common_external_files_are_updated: bool,
+}
+
+#[derive(Clone, Debug, Default)]
+pub(crate) struct ContentSetSnapshot {
+    pub versions: Vec<ContentSetSnapshotVersion>,
+    pub external_files: HashSet<String>,
+}
+
+#[derive(Clone, Debug)]
+pub(crate) struct ContentSetSnapshotVersion {
+    pub project_id: String,
+    pub version_id: String,
+    pub version_name: String,
+}
+
+impl From<Version> for ContentSetSnapshotVersion {
+    fn from(version: Version) -> Self {
+        Self {
+            project_id: version.project_id,
+            version_id: version.id,
+            version_name: version.version_number,
+        }
+    }
+}
+
+pub(crate) fn diff_content_sets(
+    current: &ContentSetSnapshot,
+    latest: &ContentSetSnapshot,
+    options: &ContentSetDiffOptions,
+) -> Vec<ContentSetDiffEntry> {
+    let current_versions = versions_by_project(current);
+    let latest_versions = versions_by_project(latest);
+    let project_ids = current_versions
+        .keys()
+        .chain(latest_versions.keys())
+        .copied()
+        .collect::<HashSet<_>>();
+
+    let mut diffs = Vec::new();
+    for project_id in project_ids {
+        let current = current_versions.get(project_id);
+        let latest = latest_versions.get(project_id);
+
+        match (current, latest) {
+            (None, Some(latest)) => {
+                diffs.push(ContentSetDiffEntry::Project {
+                    kind: ContentSetDiffKind::Added,
+                    project_id: project_id.to_string(),
+                    current_version_name: None,
+                    new_version_name: Some(latest.version_name.clone()),
+                    disabled: false,
+                });
+            }
+            (Some(current), None) => {
+                diffs.push(ContentSetDiffEntry::Project {
+                    kind: ContentSetDiffKind::Removed,
+                    project_id: project_id.to_string(),
+                    current_version_name: Some(current.version_name.clone()),
+                    new_version_name: None,
+                    disabled: options
+                        .removed_disabled_project_ids
+                        .contains(project_id),
+                });
+            }
+            (Some(current), Some(latest))
+                if current.version_id != latest.version_id =>
+            {
+                diffs.push(ContentSetDiffEntry::Project {
+                    kind: ContentSetDiffKind::Updated,
+                    project_id: project_id.to_string(),
+                    current_version_name: Some(current.version_name.clone()),
+                    new_version_name: Some(latest.version_name.clone()),
+                    disabled: false,
+                });
+            }
+            _ => {}
+        }
+    }
+
+    for file_name in latest.external_files.difference(&current.external_files) {
+        diffs.push(ContentSetDiffEntry::ExternalFile {
+            kind: ContentSetDiffKind::Added,
+            file_name: file_name.clone(),
+            disabled: false,
+        });
+    }
+
+    if options.common_external_files_are_updated {
+        for file_name in
+            latest.external_files.intersection(&current.external_files)
+        {
+            diffs.push(ContentSetDiffEntry::ExternalFile {
+                kind: ContentSetDiffKind::Updated,
+                file_name: file_name.clone(),
+                disabled: false,
+            });
+        }
+    }
+
+    for file_name in current.external_files.difference(&latest.external_files) {
+        diffs.push(ContentSetDiffEntry::ExternalFile {
+            kind: ContentSetDiffKind::Removed,
+            file_name: file_name.clone(),
+            disabled: options
+                .removed_disabled_external_files
+                .contains(file_name),
+        });
+    }
+
+    diffs
+}
+
+fn versions_by_project(
+    snapshot: &ContentSetSnapshot,
+) -> HashMap<&str, &ContentSetSnapshotVersion> {
+    snapshot
+        .versions
+        .iter()
+        .map(|version| (version.project_id.as_str(), version))
+        .collect()
+}
diff --git a/packages/app-lib/src/api/instance/lifecycle.rs b/packages/app-lib/src/api/instance/lifecycle.rs
index 0139b6b5f..94b37e1f5 100644
--- a/packages/app-lib/src/api/instance/lifecycle.rs
+++ b/packages/app-lib/src/api/instance/lifecycle.rs
@@ -101,12 +101,27 @@ pub async fn edit_icon(
     crate::state::edit_instance(
         instance_id,
         EditInstance {
-            icon_path: Some(icon_path),
+            icon_path: Some(icon_path.clone()),
             ..EditInstance::default()
         },
         &state.pool,
     )
     .await?;
+
+    if let Err(error) = super::shared::sync_shared_instance_icon(
+        instance_id,
+        icon_path.as_deref(),
+        &state,
+    )
+    .await
+    {
+        tracing::warn!(
+            instance_id,
+            error = %error,
+            "Failed to sync shared instance icon"
+        );
+    }
+
     emit_instance(&instance.id, InstancePayloadType::Edited).await?;
 
     Ok(())
diff --git a/packages/app-lib/src/api/instance/projects.rs b/packages/app-lib/src/api/instance/projects.rs
index 18c3c98e8..d8dc5f0ee 100644
--- a/packages/app-lib/src/api/instance/projects.rs
+++ b/packages/app-lib/src/api/instance/projects.rs
@@ -1,7 +1,9 @@
 use crate::event::emit::{emit_instance, emit_loading, init_loading};
 use crate::event::{InstancePayloadType, LoadingBarType};
 use crate::state::instances::adapters::sqlite::instance_rows;
-use crate::state::{CacheBehaviour, CachedEntry, ProjectType, State};
+use crate::state::{
+    CacheBehaviour, CachedEntry, ContentSourceKind, ProjectType, State,
+};
 use crate::util::fetch;
 use modrinth_content_management::{
     ContentType, ResolutionPreferences, ResolveContentPlan,
@@ -23,6 +25,7 @@ pub async fn update_all_projects(
     instance_id: &str,
 ) -> crate::Result<HashMap<String, String>> {
     let state = State::get().await?;
+    ensure_instance_content_unlocked(instance_id, &state).await?;
     let instance = get_instance_display_info(instance_id, &state).await?;
     let loading_bar = init_loading(
         LoadingBarType::InstanceUpdate {
@@ -51,13 +54,18 @@ pub async fn update_project(
     skip_send_event: Option<bool>,
 ) -> crate::Result<String> {
     let state = State::get().await?;
+    ensure_shared_instance_can_modify_project(
+        instance_id,
+        project_path,
+        &state,
+    )
+    .await?;
     let path = crate::state::instances::commands::update_project(
         instance_id,
         project_path,
         &state,
     )
     .await?;
-
     if !skip_send_event.unwrap_or(false) {
         emit_instance(instance_id, InstancePayloadType::Edited).await?;
     }
@@ -73,6 +81,7 @@ pub async fn add_project_from_version(
     dependent_on_version_id: Option<String>,
 ) -> crate::Result<String> {
     let state = State::get().await?;
+    ensure_instance_content_unlocked(instance_id, &state).await?;
     let project_path =
         crate::state::instances::commands::add_project_from_version(
             instance_id,
@@ -97,6 +106,7 @@ pub async fn install_project_with_dependencies(
     let metadata = super::get::get(instance_id).await?.ok_or_else(|| {
         crate::ErrorKind::InputError("Unknown instance".to_string())
     })?;
+    ensure_metadata_content_unlocked(&metadata)?;
     let plan = crate::state::instances::commands::resolve_install_plan(
         instance_id,
         crate::state::instances::commands::InstanceInstallProjectRequest {
@@ -181,6 +191,12 @@ pub async fn switch_project_version_with_dependencies(
     version_id: &str,
 ) -> crate::Result<String> {
     let state = State::get().await?;
+    ensure_shared_instance_can_modify_project(
+        instance_id,
+        project_path,
+        &state,
+    )
+    .await?;
     let metadata = super::get::get(instance_id).await?.ok_or_else(|| {
         crate::ErrorKind::InputError("Unknown instance".to_string())
     })?;
@@ -204,13 +220,18 @@ pub async fn add_project_from_path(
     project_type: Option<ProjectType>,
 ) -> crate::Result<String> {
     let state = State::get().await?;
-    crate::state::instances::commands::add_project_from_path(
-        instance_id,
-        path,
-        project_type,
-        &state,
-    )
-    .await
+    ensure_instance_content_unlocked(instance_id, &state).await?;
+    let project_path =
+        crate::state::instances::commands::add_project_from_path(
+            instance_id,
+            path,
+            project_type,
+            &state,
+        )
+        .await?;
+    emit_instance(instance_id, InstancePayloadType::Edited).await?;
+
+    Ok(project_path)
 }
 
 #[tracing::instrument]
@@ -235,6 +256,8 @@ pub async fn toggle_disable_project(
     desired_enabled: Option<bool>,
 ) -> crate::Result<String> {
     let state = State::get().await?;
+    ensure_shared_instance_can_modify_project(instance_id, project, &state)
+        .await?;
     let res = crate::state::instances::commands::toggle_disable_project(
         instance_id,
         project,
@@ -253,6 +276,8 @@ pub async fn remove_project(
     project: &str,
 ) -> crate::Result<()> {
     let state = State::get().await?;
+    ensure_shared_instance_can_modify_project(instance_id, project, &state)
+        .await?;
     crate::state::instances::commands::remove_project(
         instance_id,
         project,
@@ -264,6 +289,45 @@ pub async fn remove_project(
     Ok(())
 }
 
+async fn ensure_shared_instance_can_modify_project(
+    instance_id: &str,
+    project_path: &str,
+    state: &State,
+) -> crate::Result<()> {
+    let metadata = crate::state::instances::commands::get_instance_metadata(
+        instance_id,
+        &state.pool,
+    )
+    .await?
+    .ok_or_else(|| {
+        crate::ErrorKind::InputError("Unknown instance".to_string())
+    })?;
+    ensure_metadata_content_unlocked(&metadata)?;
+    if !metadata
+        .shared_instance
+        .is_some_and(|attachment| attachment.role.is_member())
+    {
+        return Ok(());
+    }
+
+    let source_kind =
+        crate::state::instances::commands::content_source_kind_for_project_path(
+            instance_id,
+            project_path,
+            state,
+        )
+        .await?;
+    if source_kind.is_some_and(ContentSourceKind::is_shared_instance_managed) {
+        return Err(crate::ErrorKind::InputError(
+            "Shared instance managed content cannot be changed directly."
+                .to_string(),
+        )
+        .into());
+    }
+
+    Ok(())
+}
+
 #[tracing::instrument]
 pub async fn update_managed_modrinth_version(
     instance_id: &str,
@@ -278,6 +342,7 @@ pub async fn update_managed_modrinth_version(
     .ok_or_else(|| {
         crate::ErrorKind::InputError("Unknown instance".to_string())
     })?;
+    ensure_metadata_content_unlocked(&metadata)?;
 
     let post_install_edit = match &metadata.link {
         crate::state::InstanceLink::ServerProjectModpack {
@@ -335,6 +400,7 @@ pub async fn repair_managed_modrinth(
     .ok_or_else(|| {
         crate::ErrorKind::InputError("Unknown instance".to_string())
     })?;
+    ensure_metadata_content_unlocked(&metadata)?;
 
     let post_install_edit = match &metadata.link {
         crate::state::InstanceLink::ServerProjectModpack { .. } => {
@@ -381,6 +447,33 @@ fn unmanaged_pack_error(instance_id: &str) -> crate::ErrorKind {
     ))
 }
 
+async fn ensure_instance_content_unlocked(
+    instance_id: &str,
+    state: &State,
+) -> crate::Result<()> {
+    if instance_rows::is_instance_quarantined(instance_id, &state.pool).await? {
+        return Err(quarantined_content_error().into());
+    }
+
+    Ok(())
+}
+
+fn ensure_metadata_content_unlocked(
+    metadata: &crate::state::InstanceMetadata,
+) -> crate::Result<()> {
+    if metadata.quarantined {
+        return Err(quarantined_content_error().into());
+    }
+
+    Ok(())
+}
+
+fn quarantined_content_error() -> crate::ErrorKind {
+    crate::ErrorKind::InputError(
+        "Content in quarantined instances cannot be changed.".to_string(),
+    )
+}
+
 async fn get_instance_display_info(
     instance_id: &str,
     state: &State,
diff --git a/packages/app-lib/src/api/instance/run.rs b/packages/app-lib/src/api/instance/run.rs
index e4d1706de..e5615dded 100644
--- a/packages/app-lib/src/api/instance/run.rs
+++ b/packages/app-lib/src/api/instance/run.rs
@@ -24,6 +24,23 @@ pub async fn run(
     quick_play_type: QuickPlayType,
 ) -> crate::Result<ProcessMetadata> {
     let state = State::get().await?;
+    if crate::state::instances::adapters::sqlite::instance_rows::is_instance_quarantined(
+        instance_id,
+        &state.pool,
+    )
+    .await?
+    {
+        return Err(crate::ErrorKind::InputError(
+            "This instance has been quarantined".to_string(),
+        )
+        .into());
+    }
+    super::shared::check_shared_instance_availability_before_launch(
+        instance_id,
+        &state,
+    )
+    .await?;
+
     let default_account = Credentials::get_default_credential(&state.pool)
         .await?
         .ok_or_else(|| crate::ErrorKind::NoCredentialsError.as_error())?;
@@ -50,6 +67,17 @@ async fn run_credentials(
                 "Tried to run a nonexistent instance {instance_id}!"
             ))
         })?;
+    if crate::state::instances::adapters::sqlite::instance_rows::is_instance_quarantined(
+        instance_id,
+        &state.pool,
+    )
+    .await?
+    {
+        return Err(crate::ErrorKind::InputError(
+            "This instance has been quarantined".to_string(),
+        )
+        .into());
+    }
 
     let pre_launch_hooks = context
         .launch_overrides
diff --git a/packages/app-lib/src/api/instance/shared/client.rs b/packages/app-lib/src/api/instance/shared/client.rs
new file mode 100644
index 000000000..05e00a46b
--- /dev/null
+++ b/packages/app-lib/src/api/instance/shared/client.rs
@@ -0,0 +1,1014 @@
+use super::install::*;
+use super::*;
+
+#[derive(Clone, Copy, Debug)]
+pub(super) enum SharedInstancesRequestAuth {
+    ModrinthSession,
+    None,
+}
+
+impl SharedInstancesRequestAuth {
+    pub(super) fn label(self) -> &'static str {
+        match self {
+            Self::ModrinthSession => "modrinth_session",
+            Self::None => "none",
+        }
+    }
+}
+
+impl SharedInstanceUnavailableReason {
+    pub(super) fn from_status(status: StatusCode) -> Option<Self> {
+        match status {
+            StatusCode::NOT_FOUND => Some(Self::Deleted),
+            StatusCode::UNAUTHORIZED => Some(Self::AccessRevoked),
+            _ => None,
+        }
+    }
+}
+
+#[derive(Debug)]
+pub(super) enum SharedInstanceRemoteResponse<T> {
+    Available(T),
+    Unavailable(SharedInstanceUnavailableReason),
+}
+
+#[derive(Clone, Debug, Deserialize)]
+pub(super) struct RemoteInstanceResponse {
+    #[serde(default)]
+    pub(super) quarantine: bool,
+}
+
+#[derive(Clone, Debug)]
+pub(super) struct ExternalFileCandidate {
+    pub(super) file_name: String,
+    pub(super) file_type: String,
+    pub(super) source: ExternalFileSource,
+}
+
+#[derive(Clone, Debug)]
+pub(super) enum ExternalFileSource {
+    InstanceFile(String),
+    ConfigBundle(Vec<u8>),
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub(super) struct ConfigFile {
+    pub(super) path: String,
+}
+
+#[derive(Clone, Debug, Serialize)]
+pub(super) struct ExternalFileData {
+    pub(super) file_name: String,
+    pub(super) file_type: String,
+}
+
+#[derive(Clone, Debug, Deserialize)]
+pub(super) struct CreateInstanceResponse {
+    #[serde(alias = "instance_id")]
+    pub(super) id: String,
+}
+
+#[derive(Clone, Debug, Deserialize)]
+pub(super) struct CreateInstanceInviteResponse {
+    pub(super) id: String,
+}
+
+#[derive(Clone, Debug, Deserialize)]
+pub(super) struct BlacklistStatusResponse {
+    pub(super) blacklisted: bool,
+}
+
+#[derive(Clone, Debug, Deserialize)]
+pub(super) struct InstanceInviteInfoResponse {
+    pub(super) instance_id: String,
+    pub(super) instance_name: String,
+    #[serde(default)]
+    pub(super) instance_icon: Option<String>,
+    #[serde(default)]
+    pub(super) managers: Vec<InstanceInviteManagerResponse>,
+}
+
+#[derive(Clone, Debug, Deserialize)]
+#[serde(tag = "type", rename_all = "snake_case")]
+pub(super) enum InstanceInviteManagerResponse {
+    User { id: String },
+    Server { name: String, icon: Option<String> },
+}
+
+#[derive(Clone, Debug, Deserialize)]
+pub(super) struct InstanceVersionResponse {
+    pub(super) version: i32,
+    #[serde(default)]
+    pub(super) modrinth_ids: Vec<String>,
+    pub(super) ready: bool,
+    #[serde(default)]
+    pub(super) external_files: Vec<ExternalFileResponse>,
+    #[serde(default)]
+    pub(super) modpack_id: Option<String>,
+    pub(super) game_version: String,
+    pub(super) loader: ModLoader,
+    pub(super) loader_version: String,
+}
+
+#[derive(Clone, Debug, Deserialize)]
+pub(super) struct ExternalFileResponse {
+    pub(super) file_name: String,
+    pub(super) file_type: String,
+    pub(super) url: String,
+    #[serde(default)]
+    pub(super) file_size: Option<i64>,
+}
+
+#[derive(Clone, Debug, Deserialize)]
+pub(super) struct RemoteSharedInstanceUsers {
+    #[serde(default)]
+    pub(super) users: Vec<SharedInstanceUser>,
+    #[serde(default)]
+    pub(super) tokens: i32,
+}
+
+#[derive(Clone, Debug, Deserialize)]
+#[serde(untagged)]
+pub(super) enum RemoteSharedInstanceUsersResponse {
+    Current(RemoteSharedInstanceUsers),
+    Legacy(Vec<String>),
+}
+
+impl RemoteSharedInstanceUsersResponse {
+    pub(super) fn into_shared_users(self) -> SharedInstanceUsers {
+        match self {
+            Self::Current(response) => {
+                SharedInstanceUsers::from_users(response.users, response.tokens)
+            }
+            Self::Legacy(user_ids) => {
+                SharedInstanceUsers::from_user_ids(user_ids)
+            }
+        }
+    }
+}
+
+pub(super) async fn create_remote_instance(
+    name: String,
+    state: &State,
+) -> crate::Result<CreateInstanceResponse> {
+    request_json(
+        "create_instance",
+        Method::POST,
+        "/instances",
+        Some(json!({ "name": name })),
+        state,
+    )
+    .await
+}
+
+pub(super) async fn get_user_blacklist_status(
+    user_id: &str,
+    state: &State,
+) -> crate::Result<BlacklistStatusResponse> {
+    request_json(
+        "get_user_blacklist_status",
+        Method::GET,
+        &format!("/blacklist/{user_id}"),
+        None,
+        state,
+    )
+    .await
+}
+
+pub(super) async fn delete_remote_instance(
+    shared_instance_id: &str,
+    state: &State,
+) -> crate::Result<()> {
+    let operation = "delete_instance";
+    let method = Method::DELETE;
+    let path = format!("/instances/{shared_instance_id}");
+    let response =
+        send_request(operation, method.clone(), &path, None, state).await?;
+
+    if response.status().is_success()
+        || matches!(response.status(), StatusCode::NOT_FOUND | StatusCode::GONE)
+    {
+        return Ok(());
+    }
+
+    shared_instances_request_error(operation, method, &path, response).await
+}
+
+pub(super) async fn update_remote_instance(
+    shared_instance_id: &str,
+    name: String,
+    state: &State,
+) -> crate::Result<()> {
+    let operation = "update_instance";
+    let method = Method::PATCH;
+    let path = format!("/instances/{shared_instance_id}");
+    let response = send_request(
+        operation,
+        method.clone(),
+        &path,
+        Some(json!({ "name": name })),
+        state,
+    )
+    .await?;
+
+    if response.status().is_success() {
+        return Ok(());
+    }
+
+    if response.status() == StatusCode::METHOD_NOT_ALLOWED {
+        let request_id = response_request_id(&response);
+        tracing::warn!(
+            operation,
+            method = method.as_str(),
+            path,
+            status = StatusCode::METHOD_NOT_ALLOWED.as_u16(),
+            request_id = request_id.as_deref().unwrap_or("none"),
+            "Shared instances API does not support remote instance updates; skipping name sync"
+        );
+        return Ok(());
+    }
+
+    shared_instances_request_error(operation, method, &path, response).await
+}
+
+pub(super) async fn get_remote_instance_access(
+    shared_instance_id: &str,
+    state: &State,
+) -> crate::Result<SharedInstanceRemoteResponse<()>> {
+    let operation = "get_instance";
+    let method = Method::GET;
+    let path = format!("/instances/{shared_instance_id}");
+    let response =
+        send_request(operation, method.clone(), &path, None, state).await?;
+
+    if let Some(reason) =
+        SharedInstanceUnavailableReason::from_status(response.status())
+    {
+        if reason == SharedInstanceUnavailableReason::AccessRevoked
+            && !active_modrinth_session_is_valid(state).await?
+        {
+            return Err(crate::ErrorKind::NoCredentialsError.into());
+        }
+
+        return Ok(SharedInstanceRemoteResponse::Unavailable(reason));
+    }
+
+    if !response.status().is_success() {
+        return shared_instances_request_error(
+            operation, method, &path, response,
+        )
+        .await;
+    }
+
+    let instance = decode_json_response::<RemoteInstanceResponse>(
+        operation, method, &path, response,
+    )
+    .await?;
+    if instance.quarantine {
+        return Ok(SharedInstanceRemoteResponse::Unavailable(
+            SharedInstanceUnavailableReason::Quarantined,
+        ));
+    }
+
+    Ok(SharedInstanceRemoteResponse::Available(()))
+}
+
+pub(super) async fn update_remote_instance_icon(
+    shared_instance_id: &str,
+    icon_path: Option<&str>,
+    state: &State,
+) -> crate::Result<()> {
+    let path = format!("/instances/{shared_instance_id}/icon");
+    let Some(icon_path) = icon_path else {
+        return request_empty(
+            "delete_instance_icon",
+            Method::DELETE,
+            &path,
+            None,
+            state,
+        )
+        .await;
+    };
+
+    let bytes = crate::util::io::read(icon_path).await?;
+    let operation = "upload_instance_icon";
+    let method = Method::PUT;
+    let response =
+        send_bytes_request(operation, method.clone(), &path, bytes, state)
+            .await?;
+
+    if response.status().is_success() {
+        return Ok(());
+    }
+
+    shared_instances_request_error(operation, method, &path, response).await
+}
+
+pub(super) async fn get_remote_users(
+    shared_instance_id: &str,
+    state: &State,
+) -> crate::Result<SharedInstanceUsers> {
+    let users = request_json::<RemoteSharedInstanceUsersResponse>(
+        "get_instance_users",
+        Method::GET,
+        &format!("/instances/{shared_instance_id}/users"),
+        None,
+        state,
+    )
+    .await?;
+
+    Ok(users.into_shared_users())
+}
+
+pub(super) async fn get_latest_remote_version(
+    shared_instance_id: &str,
+    state: &State,
+) -> crate::Result<InstanceVersionResponse> {
+    match get_latest_remote_version_optional_unavailable(
+        shared_instance_id,
+        state,
+    )
+    .await?
+    {
+        SharedInstanceRemoteResponse::Available(version) => Ok(version),
+        SharedInstanceRemoteResponse::Unavailable(
+            reason @ SharedInstanceUnavailableReason::AccessRevoked,
+        ) => {
+            if !accept_pending_remote_invite(shared_instance_id, state).await? {
+                return Err(shared_instance_unavailable_error(reason));
+            }
+
+            match get_latest_remote_version_optional_unavailable(
+                shared_instance_id,
+                state,
+            )
+            .await?
+            {
+                SharedInstanceRemoteResponse::Available(version) => Ok(version),
+                SharedInstanceRemoteResponse::Unavailable(reason) => {
+                    Err(shared_instance_unavailable_error(reason))
+                }
+            }
+        }
+        SharedInstanceRemoteResponse::Unavailable(reason) => {
+            Err(shared_instance_unavailable_error(reason))
+        }
+    }
+}
+
+pub(super) async fn get_latest_remote_version_optional_unavailable(
+    shared_instance_id: &str,
+    state: &State,
+) -> crate::Result<SharedInstanceRemoteResponse<InstanceVersionResponse>> {
+    get_latest_remote_version_optional_unavailable_with_auth(
+        shared_instance_id,
+        state,
+        SharedInstancesRequestAuth::ModrinthSession,
+    )
+    .await
+}
+
+pub(super) async fn get_latest_remote_version_optional_unavailable_with_auth(
+    shared_instance_id: &str,
+    state: &State,
+    auth: SharedInstancesRequestAuth,
+) -> crate::Result<SharedInstanceRemoteResponse<InstanceVersionResponse>> {
+    request_json_optional_unavailable(
+        "get_latest_instance_version",
+        Method::GET,
+        &format!("/instances/{shared_instance_id}/versions"),
+        None,
+        state,
+        auth,
+    )
+    .await
+}
+
+pub(super) async fn add_remote_users(
+    shared_instance_id: &str,
+    user_ids: Vec<String>,
+    state: &State,
+) -> crate::Result<()> {
+    request_empty(
+        "add_instance_users",
+        Method::POST,
+        &format!("/instances/{shared_instance_id}/users"),
+        Some(json!({ "user_ids": user_ids })),
+        state,
+    )
+    .await
+}
+
+pub(super) async fn remove_remote_users(
+    shared_instance_id: &str,
+    user_ids: Vec<String>,
+    state: &State,
+) -> crate::Result<()> {
+    request_empty(
+        "remove_instance_users",
+        Method::DELETE,
+        &format!("/instances/{shared_instance_id}/users"),
+        Some(json!({ "user_ids": user_ids })),
+        state,
+    )
+    .await
+}
+
+pub(super) async fn accept_pending_remote_invite(
+    shared_instance_id: &str,
+    state: &State,
+) -> crate::Result<bool> {
+    let operation = "accept_pending_instance_invite";
+    let method = Method::POST;
+    let path = format!("/instances/{shared_instance_id}/invites/pending");
+    let response =
+        send_request(operation, method.clone(), &path, None, state).await?;
+
+    match response.status() {
+        StatusCode::OK | StatusCode::NO_CONTENT => Ok(true),
+        StatusCode::NOT_FOUND => Ok(false),
+        status if status.is_success() => Ok(true),
+        _ => {
+            shared_instances_request_error(operation, method, &path, response)
+                .await
+        }
+    }
+}
+
+pub(super) async fn accept_shared_instance_invite(
+    shared_instance_id: &str,
+    invite_id: &str,
+    state: &State,
+) -> crate::Result<()> {
+    let path = format!("/instances/{shared_instance_id}/invites/{invite_id}");
+    let log_path = "/instances/:instance_id/invites/:invite_id";
+    let operation = "accept_instance_invite";
+    let method = Method::POST;
+
+    let response = send_request_with_auth_and_log_path(
+        operation,
+        method.clone(),
+        &path,
+        log_path,
+        None,
+        state,
+        SharedInstancesRequestAuth::ModrinthSession,
+    )
+    .await?;
+    if response.status().is_success() {
+        return Ok(());
+    }
+
+    let status = response.status();
+    let request_id = response_request_id(&response);
+    let body = response
+        .text()
+        .await
+        .map_err(reqwest::Error::without_url)
+        .unwrap_or_default();
+    if status == StatusCode::BAD_REQUEST && body.contains("already has access")
+    {
+        return Ok(());
+    }
+
+    tracing::warn!(
+        operation,
+        method = method.as_str(),
+        path = log_path,
+        status = status.as_u16(),
+        request_id = request_id.as_deref().unwrap_or("none"),
+        "Shared instances API request failed"
+    );
+    Err(crate::ErrorKind::OtherError(format!(
+		"Shared instances API request {operation} {method} {log_path} failed with status {status}"
+	))
+	.into())
+}
+
+pub(super) async fn delete_remote_invite(
+    shared_instance_id: &str,
+    invite_id: &str,
+    state: &State,
+) -> crate::Result<()> {
+    let path = format!("/instances/{shared_instance_id}/invites/{invite_id}");
+    request_empty_with_log_path(
+        "delete_instance_invite",
+        Method::DELETE,
+        &path,
+        "/instances/:instance_id/invites/:invite_id",
+        None,
+        state,
+    )
+    .await
+}
+
+pub(super) async fn get_shared_instance_invite_info(
+    invite_id: &str,
+    state: &State,
+) -> crate::Result<InstanceInviteInfoResponse> {
+    let operation = "get_instance_invite";
+    let method = Method::GET;
+    let path = format!("/invites/{invite_id}");
+    let log_path = "/invites/:invite_id";
+    let response = send_request_with_auth_and_log_path(
+        operation,
+        method.clone(),
+        &path,
+        log_path,
+        None,
+        state,
+        SharedInstancesRequestAuth::None,
+    )
+    .await?;
+    if !response.status().is_success() {
+        return shared_instances_request_error(
+            operation, method, log_path, response,
+        )
+        .await;
+    }
+
+    decode_json_response_with_log_path(
+        operation, method, log_path, response, true,
+    )
+    .await
+}
+
+pub(super) async fn decline_pending_remote_invite(
+    shared_instance_id: &str,
+    state: &State,
+) -> crate::Result<()> {
+    request_empty(
+        "decline_pending_instance_invite",
+        Method::DELETE,
+        &format!("/instances/{shared_instance_id}/invites/pending"),
+        None,
+        state,
+    )
+    .await
+}
+
+pub(super) async fn request_json<T>(
+    operation: &'static str,
+    method: Method,
+    path: &str,
+    body: Option<serde_json::Value>,
+    state: &State,
+) -> crate::Result<T>
+where
+    T: DeserializeOwned,
+{
+    let response =
+        request(operation, method.clone(), path, body, state).await?;
+    decode_json_response(operation, method, path, response).await
+}
+
+pub(super) async fn request_json_optional_unavailable<T>(
+    operation: &'static str,
+    method: Method,
+    path: &str,
+    body: Option<serde_json::Value>,
+    state: &State,
+    auth: SharedInstancesRequestAuth,
+) -> crate::Result<SharedInstanceRemoteResponse<T>>
+where
+    T: DeserializeOwned,
+{
+    let response = send_request_with_auth(
+        operation,
+        method.clone(),
+        path,
+        body,
+        state,
+        auth,
+    )
+    .await?;
+    if let Some(reason) =
+        SharedInstanceUnavailableReason::from_status(response.status())
+    {
+        if reason == SharedInstanceUnavailableReason::AccessRevoked
+            && matches!(auth, SharedInstancesRequestAuth::ModrinthSession)
+            && !active_modrinth_session_is_valid(state).await?
+        {
+            tracing::warn!(
+                operation,
+                method = method.as_str(),
+                path,
+                status = response.status().as_u16(),
+                "Shared instances API returned unauthorized while Modrinth auth is unavailable"
+            );
+            return Err(crate::ErrorKind::NoCredentialsError.into());
+        }
+
+        tracing::warn!(
+            operation,
+            method = method.as_str(),
+            path,
+            status = response.status().as_u16(),
+            "Shared instances API resource is unavailable"
+        );
+        return Ok(SharedInstanceRemoteResponse::Unavailable(reason));
+    }
+
+    if !response.status().is_success() {
+        return shared_instances_request_error(
+            operation, method, path, response,
+        )
+        .await;
+    }
+
+    decode_json_response(operation, method, path, response)
+        .await
+        .map(SharedInstanceRemoteResponse::Available)
+}
+
+pub(super) async fn active_modrinth_session_is_valid(
+    state: &State,
+) -> crate::Result<bool> {
+    let Some(credentials) =
+        ModrinthCredentials::get_and_refresh(&state.pool, &state.api_semaphore)
+            .await?
+    else {
+        return Ok(false);
+    };
+
+    let _permit = state.api_semaphore.0.acquire().await?;
+    let response = INSECURE_REQWEST_CLIENT
+        .get(concat!(env!("MODRINTH_API_URL"), "user"))
+        .header("Authorization", &credentials.session)
+        .send()
+        .await?;
+
+    if response.status() == StatusCode::UNAUTHORIZED {
+        ModrinthCredentials::remove(&credentials.user_id, &state.pool).await?;
+        return Ok(false);
+    }
+
+    if response.status().is_success() {
+        return Ok(true);
+    }
+
+    let status = response.status();
+    let request_id = response_request_id(&response);
+    tracing::warn!(
+        operation = "validate_modrinth_session",
+        method = Method::GET.as_str(),
+        path = "/user",
+        status = status.as_u16(),
+        request_id = request_id.as_deref().unwrap_or("none"),
+        "Modrinth auth validation request failed"
+    );
+    Err(crate::ErrorKind::OtherError(format!(
+        "Modrinth auth validation failed with status {status}"
+    ))
+    .into())
+}
+
+pub(super) async fn decode_json_response<T>(
+    operation: &'static str,
+    method: Method,
+    path: &str,
+    response: reqwest::Response,
+) -> crate::Result<T>
+where
+    T: DeserializeOwned,
+{
+    decode_json_response_with_log_path(operation, method, path, response, false)
+        .await
+}
+
+async fn decode_json_response_with_log_path<T>(
+    operation: &'static str,
+    method: Method,
+    log_path: &str,
+    response: reqwest::Response,
+    strip_response_url: bool,
+) -> crate::Result<T>
+where
+    T: DeserializeOwned,
+{
+    let status = response.status();
+    let request_id = response_request_id(&response);
+    let body = match response.text().await {
+        Ok(body) => body,
+        Err(error) if strip_response_url => {
+            return Err(error.without_url().into());
+        }
+        Err(error) => return Err(error.into()),
+    };
+    serde_json::from_str::<T>(&body).map_err(|error| {
+		tracing::warn!(
+			operation,
+			method = method.as_str(),
+			path = log_path,
+			status = status.as_u16(),
+			request_id = request_id.as_deref().unwrap_or("none"),
+			error_category = ?error.classify(),
+            error_line = error.line(),
+            error_column = error.column(),
+            "Shared instances API returned an invalid JSON response"
+		);
+		crate::ErrorKind::OtherError(format!(
+			"Shared instances API request {operation} {method} {log_path} returned invalid JSON with status {status}"
+		))
+		.into()
+	})
+}
+
+pub(super) async fn request_empty(
+    operation: &'static str,
+    method: Method,
+    path: &str,
+    body: Option<serde_json::Value>,
+    state: &State,
+) -> crate::Result<()> {
+    request(operation, method, path, body, state).await?;
+    Ok(())
+}
+
+async fn request_empty_with_log_path(
+    operation: &'static str,
+    method: Method,
+    path: &str,
+    log_path: &str,
+    body: Option<serde_json::Value>,
+    state: &State,
+) -> crate::Result<()> {
+    let response = send_request_with_auth_and_log_path(
+        operation,
+        method.clone(),
+        path,
+        log_path,
+        body,
+        state,
+        SharedInstancesRequestAuth::ModrinthSession,
+    )
+    .await?;
+    if response.status().is_success() {
+        return Ok(());
+    }
+
+    shared_instances_request_error(operation, method, log_path, response).await
+}
+
+pub(super) async fn request(
+    operation: &'static str,
+    method: Method,
+    path: &str,
+    body: Option<serde_json::Value>,
+    state: &State,
+) -> crate::Result<reqwest::Response> {
+    let response =
+        send_request(operation, method.clone(), path, body, state).await?;
+    if response.status().is_success() {
+        return Ok(response);
+    }
+
+    shared_instances_request_error(operation, method, path, response).await
+}
+
+pub(super) async fn send_request(
+    operation: &'static str,
+    method: Method,
+    path: &str,
+    body: Option<serde_json::Value>,
+    state: &State,
+) -> crate::Result<reqwest::Response> {
+    send_request_with_auth(
+        operation,
+        method,
+        path,
+        body,
+        state,
+        SharedInstancesRequestAuth::ModrinthSession,
+    )
+    .await
+}
+
+pub(super) async fn send_bytes_request(
+    operation: &'static str,
+    method: Method,
+    path: &str,
+    body: Vec<u8>,
+    state: &State,
+) -> crate::Result<reqwest::Response> {
+    let base_url = service_base_url();
+    let url = service_url(base_url, path);
+    send_bytes_request_to_url(operation, method, path, &url, body, state).await
+}
+
+pub(super) async fn send_bytes_request_to_url(
+    operation: &'static str,
+    method: Method,
+    path: &str,
+    url: &str,
+    body: Vec<u8>,
+    state: &State,
+) -> crate::Result<reqwest::Response> {
+    let service_origin = url::Url::parse(service_base_url())
+        .map_err(|error| {
+            crate::ErrorKind::OtherError(format!(
+                "Invalid shared instances API base URL: {error}"
+            ))
+        })?
+        .origin();
+    let upload_origin = url::Url::parse(url)
+        .map_err(|error| {
+            crate::ErrorKind::OtherError(format!(
+                "Invalid shared instances upload URL: {error}"
+            ))
+        })?
+        .origin();
+    if service_origin != upload_origin {
+        return Err(crate::ErrorKind::OtherError(
+            "Shared instances upload URL has an unexpected origin".to_string(),
+        )
+        .into());
+    }
+
+    let credentials =
+        ModrinthCredentials::get_and_refresh(&state.pool, &state.api_semaphore)
+            .await?
+            .ok_or(crate::ErrorKind::NoCredentialsError)?;
+    let _permit = state.api_semaphore.0.acquire().await?;
+
+    tracing::debug!(
+        operation,
+        method = method.as_str(),
+        path,
+        url = %url,
+        user_id = credentials.user_id.as_str(),
+        auth = SharedInstancesRequestAuth::ModrinthSession.label(),
+        has_body = true,
+        "Sending shared instances API request"
+    );
+
+    let response = shared_instances_client(url)
+        .request(method.clone(), url)
+        .bearer_auth(credentials.session)
+        .header(reqwest::header::CONTENT_TYPE, "application/octet-stream")
+        .body(body)
+        .send()
+        .await?;
+
+    if response.status().is_success() {
+        let request_id = response_request_id(&response);
+        tracing::debug!(
+            operation,
+            method = method.as_str(),
+            path,
+            url = %url,
+            status = response.status().as_u16(),
+            request_id = request_id.as_deref().unwrap_or("none"),
+            "Shared instances API request succeeded"
+        );
+    }
+
+    Ok(response)
+}
+
+pub(super) async fn send_request_with_auth(
+    operation: &'static str,
+    method: Method,
+    path: &str,
+    body: Option<serde_json::Value>,
+    state: &State,
+    auth: SharedInstancesRequestAuth,
+) -> crate::Result<reqwest::Response> {
+    send_request_with_auth_and_log_path(
+        operation, method, path, path, body, state, auth,
+    )
+    .await
+}
+
+async fn send_request_with_auth_and_log_path(
+    operation: &'static str,
+    method: Method,
+    path: &str,
+    log_path: &str,
+    body: Option<serde_json::Value>,
+    state: &State,
+    auth: SharedInstancesRequestAuth,
+) -> crate::Result<reqwest::Response> {
+    let modrinth_credentials =
+        if matches!(auth, SharedInstancesRequestAuth::ModrinthSession) {
+            Some(
+                ModrinthCredentials::get_and_refresh(
+                    &state.pool,
+                    &state.api_semaphore,
+                )
+                .await?
+                .ok_or(crate::ErrorKind::NoCredentialsError)?,
+            )
+        } else {
+            None
+        };
+    let _permit = state.api_semaphore.0.acquire().await?;
+    let base_url = service_base_url();
+    let url = service_url(base_url, path);
+    let log_url = service_url(base_url, log_path);
+    let mut request =
+        shared_instances_client(base_url).request(method.clone(), &url);
+    let mut user_id = None;
+
+    match auth {
+        SharedInstancesRequestAuth::ModrinthSession => {
+            let credentials = modrinth_credentials
+                .expect("Modrinth session credentials were loaded");
+            user_id = Some(credentials.user_id);
+            request = request.bearer_auth(credentials.session);
+        }
+        SharedInstancesRequestAuth::None => {}
+    }
+
+    tracing::debug!(
+        operation,
+        method = method.as_str(),
+        path = log_path,
+        url = %log_url,
+        user_id = user_id.as_deref(),
+        auth = auth.label(),
+        has_body = body.is_some(),
+        "Sending shared instances API request"
+    );
+
+    if let Some(body) = body {
+        request = request.json(&body);
+    }
+
+    let response = match request.send().await {
+        Ok(response) => response,
+        Err(error) if path != log_path => {
+            return Err(error.without_url().into());
+        }
+        Err(error) => return Err(error.into()),
+    };
+    if response.status().is_success() {
+        let request_id = response_request_id(&response);
+        tracing::debug!(
+            operation,
+            method = method.as_str(),
+            path = log_path,
+            url = %log_url,
+            status = response.status().as_u16(),
+            request_id = request_id.as_deref().unwrap_or("none"),
+            "Shared instances API request succeeded"
+        );
+    }
+    Ok(response)
+}
+
+pub(super) async fn shared_instances_request_error<T>(
+    operation: &'static str,
+    method: Method,
+    path: &str,
+    response: reqwest::Response,
+) -> crate::Result<T> {
+    let status = response.status();
+    let request_id = response_request_id(&response);
+    tracing::warn!(
+        operation,
+        method = method.as_str(),
+        path,
+        status = status.as_u16(),
+        request_id = request_id.as_deref().unwrap_or("none"),
+        "Shared instances API request failed"
+    );
+    Err(crate::ErrorKind::OtherError(format!(
+        "Shared instances API request {operation} {method} {path} failed with status {status}"
+    ))
+    .into())
+}
+
+pub(super) fn response_request_id(
+    response: &reqwest::Response,
+) -> Option<String> {
+    let request_id = response.headers().get("x-request-id")?.to_str().ok()?;
+    if request_id.is_empty()
+        || request_id.len() > 128
+        || !request_id.chars().all(|character| {
+            character.is_ascii_alphanumeric() || "-_.:".contains(character)
+        })
+    {
+        return None;
+    }
+
+    Some(request_id.to_string())
+}
+
+pub(super) fn service_url(base_url: &str, path: &str) -> String {
+    format!("{base_url}/v1{path}")
+}
+
+pub(super) fn service_base_url() -> &'static str {
+    env!("SHARED_INSTANCES_API_BASE_URL").trim_end_matches('/')
+}
+
+pub(super) fn shared_instances_client(
+    base_url: &str,
+) -> &'static reqwest::Client {
+    if base_url.starts_with("https://") {
+        &REQWEST_CLIENT
+    } else {
+        &INSECURE_REQWEST_CLIENT
+    }
+}
diff --git a/packages/app-lib/src/api/instance/shared/diff.rs b/packages/app-lib/src/api/instance/shared/diff.rs
new file mode 100644
index 000000000..072c9cb66
--- /dev/null
+++ b/packages/app-lib/src/api/instance/shared/diff.rs
@@ -0,0 +1,432 @@
+use super::client::*;
+use super::publish::*;
+use super::types::*;
+use super::*;
+
+pub(super) async fn shared_instance_update_diffs(
+    metadata: &crate::state::InstanceMetadata,
+    version: &InstanceVersionResponse,
+    state: &State,
+) -> crate::Result<Vec<SharedInstanceUpdateDiff>> {
+    let remote_modpack_id =
+        version.modpack_id.as_deref().filter(|id| !id.is_empty());
+    let current_modpack_id = shared_modpack_id(&metadata.link);
+    let modpack_unlinked =
+        current_modpack_id.is_some() && remote_modpack_id.is_none();
+    let (current_version_ids, current_external_files) =
+        current_shared_content(metadata, modpack_unlinked, state).await?;
+    let (latest_version_ids, latest_external_files) =
+        remote_shared_content(version);
+    let removed_disabled_project_ids = HashSet::new();
+    let removed_disabled_external_files = HashSet::new();
+    let mut diffs = shared_content_diffs(
+        &current_version_ids,
+        &current_external_files,
+        &latest_version_ids,
+        &latest_external_files,
+        &removed_disabled_project_ids,
+        &removed_disabled_external_files,
+        true,
+        state,
+    )
+    .await?;
+    let mut configuration_diffs = shared_instance_configuration_diffs(
+        current_modpack_id.as_deref(),
+        remote_modpack_id,
+        &metadata.applied_content_set.game_version,
+        &version.game_version,
+        metadata.applied_content_set.loader,
+        version.loader,
+        metadata.applied_content_set.loader_version.as_deref(),
+        Some(version.loader_version.as_str()),
+        state,
+    )
+    .await?;
+    configuration_diffs.append(&mut diffs);
+
+    Ok(configuration_diffs)
+}
+
+pub(super) async fn shared_instance_publish_diffs(
+    metadata: &crate::state::InstanceMetadata,
+    version: &InstanceVersionResponse,
+    snapshot: &CurrentPublishSnapshot,
+    state: &State,
+) -> crate::Result<Vec<SharedInstanceUpdateDiff>> {
+    let remote_modpack_id =
+        version.modpack_id.as_deref().filter(|id| !id.is_empty());
+    let current_modpack_id = shared_modpack_id(&metadata.link);
+    let modpack_unlinked =
+        remote_modpack_id.is_some() && current_modpack_id.is_none();
+    let disabled_versions = async {
+        if snapshot.disabled_version_ids.is_empty() {
+            Ok(HashMap::new())
+        } else {
+            shared_versions_by_project(&snapshot.disabled_version_ids, state)
+                .await
+        }
+    };
+    let ((latest_version_ids, latest_external_files), disabled_versions) = tokio::try_join!(
+        remote_publish_content(version, modpack_unlinked, state),
+        disabled_versions,
+    )?;
+    let current_external_files = snapshot
+        .external_files
+        .iter()
+        .map(|file| file.file_name.clone())
+        .collect::<HashSet<_>>();
+    let current_version_ids = snapshot
+        .version_ids
+        .iter()
+        .filter(|id| current_modpack_id.as_deref() != Some(id.as_str()))
+        .cloned()
+        .collect::<Vec<_>>();
+    let mut removed_disabled_project_ids =
+        snapshot.disabled_project_ids.clone();
+    removed_disabled_project_ids.extend(disabled_versions.into_keys());
+    let mut diffs = shared_content_diffs(
+        &latest_version_ids,
+        &latest_external_files,
+        &current_version_ids,
+        &current_external_files,
+        &removed_disabled_project_ids,
+        &snapshot.disabled_external_files,
+        false,
+        state,
+    )
+    .await?;
+    let mut configuration_diffs = shared_instance_configuration_diffs(
+        remote_modpack_id,
+        current_modpack_id.as_deref(),
+        &version.game_version,
+        &metadata.applied_content_set.game_version,
+        version.loader,
+        metadata.applied_content_set.loader,
+        Some(version.loader_version.as_str()),
+        metadata.applied_content_set.loader_version.as_deref(),
+        state,
+    )
+    .await?;
+    configuration_diffs.append(&mut diffs);
+
+    Ok(configuration_diffs)
+}
+
+pub(super) async fn shared_instance_configuration_diffs(
+    current_modpack_id: Option<&str>,
+    new_modpack_id: Option<&str>,
+    current_game_version: &str,
+    new_game_version: &str,
+    current_loader: ModLoader,
+    new_loader: ModLoader,
+    current_loader_version: Option<&str>,
+    new_loader_version: Option<&str>,
+    state: &State,
+) -> crate::Result<Vec<SharedInstanceUpdateDiff>> {
+    let mut diffs = Vec::new();
+
+    if current_modpack_id != new_modpack_id {
+        match (current_modpack_id, new_modpack_id) {
+            (None, Some(_)) => diffs.push(configuration_diff(
+                SharedInstanceUpdateDiffType::ModpackLinked,
+                None,
+                shared_modpack_version_label(new_modpack_id, state).await,
+            )),
+            (Some(_), None) => diffs.push(configuration_diff(
+                SharedInstanceUpdateDiffType::ModpackUnlinked,
+                shared_modpack_version_label(current_modpack_id, state).await,
+                None,
+            )),
+            (Some(current_modpack_id), Some(new_modpack_id)) => {
+                let current =
+                    shared_modpack_version_details(current_modpack_id, state)
+                        .await;
+                let new =
+                    shared_modpack_version_details(new_modpack_id, state).await;
+                let project_name = new
+                    .as_ref()
+                    .and_then(|details| details.project_name.clone())
+                    .or_else(|| {
+                        current
+                            .as_ref()
+                            .and_then(|details| details.project_name.clone())
+                    });
+
+                diffs.push(SharedInstanceUpdateDiff {
+                    type_: SharedInstanceUpdateDiffType::ModpackUpdated,
+                    project_id: None,
+                    project_name,
+                    file_name: None,
+                    current_version_name: current
+                        .map(|details| details.version_name),
+                    new_version_name: new.map(|details| details.version_name),
+                    config_file_count: None,
+                    disabled: false,
+                });
+            }
+            (None, None) => unreachable!(),
+        }
+    }
+
+    if current_game_version != new_game_version {
+        diffs.push(configuration_diff(
+            SharedInstanceUpdateDiffType::GameVersionUpdated,
+            Some(current_game_version.to_string()),
+            Some(new_game_version.to_string()),
+        ));
+    }
+
+    let current_loader_version =
+        normalized_loader_version(current_loader_version);
+    let new_loader_version = normalized_loader_version(new_loader_version);
+    if current_loader != new_loader
+        || current_loader_version != new_loader_version
+    {
+        diffs.push(configuration_diff(
+            SharedInstanceUpdateDiffType::LoaderUpdated,
+            Some(shared_loader_label(current_loader, current_loader_version)),
+            Some(shared_loader_label(new_loader, new_loader_version)),
+        ));
+    }
+
+    Ok(diffs)
+}
+
+pub(super) fn configuration_diff(
+    type_: SharedInstanceUpdateDiffType,
+    current_version_name: Option<String>,
+    new_version_name: Option<String>,
+) -> SharedInstanceUpdateDiff {
+    SharedInstanceUpdateDiff {
+        type_,
+        project_id: None,
+        project_name: None,
+        file_name: None,
+        current_version_name,
+        new_version_name,
+        config_file_count: None,
+        disabled: false,
+    }
+}
+
+pub(super) async fn shared_modpack_version_label(
+    version_id: Option<&str>,
+    state: &State,
+) -> Option<String> {
+    let version_id = version_id?;
+    let details = shared_modpack_version_details(version_id, state).await?;
+
+    Some(match details.project_name {
+        Some(project_name) => {
+            format!("{project_name} {}", details.version_name)
+        }
+        None => details.version_name,
+    })
+}
+
+struct SharedModpackVersionDetails {
+    project_name: Option<String>,
+    version_name: String,
+}
+
+async fn shared_modpack_version_details(
+    version_id: &str,
+    state: &State,
+) -> Option<SharedModpackVersionDetails> {
+    let Some(version) = CachedEntry::get_version(
+        version_id,
+        Some(CacheBehaviour::Bypass),
+        &state.pool,
+        &state.api_semaphore,
+    )
+    .await
+    .ok()
+    .flatten() else {
+        return Some(SharedModpackVersionDetails {
+            project_name: None,
+            version_name: version_id.to_string(),
+        });
+    };
+    let project = CachedEntry::get_project(
+        &version.project_id,
+        Some(CacheBehaviour::Bypass),
+        &state.pool,
+        &state.api_semaphore,
+    )
+    .await
+    .ok()
+    .flatten();
+
+    Some(SharedModpackVersionDetails {
+        project_name: Some(
+            project.map(|project| project.title).unwrap_or(version.name),
+        ),
+        version_name: version.version_number,
+    })
+}
+
+pub(super) fn normalized_loader_version(
+    loader_version: Option<&str>,
+) -> Option<&str> {
+    loader_version.filter(|version| !version.is_empty())
+}
+
+pub(super) fn shared_loader_label(
+    loader: ModLoader,
+    loader_version: Option<&str>,
+) -> String {
+    let loader_name = match loader {
+        ModLoader::Vanilla => "Vanilla",
+        ModLoader::Forge => "Forge",
+        ModLoader::Fabric => "Fabric",
+        ModLoader::Quilt => "Quilt",
+        ModLoader::NeoForge => "NeoForge",
+    };
+
+    match loader_version {
+        Some(version) => format!("{loader_name} {version}"),
+        None => loader_name.to_string(),
+    }
+}
+
+pub(super) async fn shared_content_diffs(
+    current_version_ids: &[String],
+    current_external_files: &HashSet<String>,
+    latest_version_ids: &[String],
+    latest_external_files: &HashSet<String>,
+    removed_disabled_project_ids: &HashSet<String>,
+    removed_disabled_external_files: &HashSet<String>,
+    common_external_files_are_updated: bool,
+    state: &State,
+) -> crate::Result<Vec<SharedInstanceUpdateDiff>> {
+    let current = shared_content_snapshot(
+        current_version_ids,
+        current_external_files,
+        state,
+    )
+    .await?;
+    let latest = shared_content_snapshot(
+        latest_version_ids,
+        latest_external_files,
+        state,
+    )
+    .await?;
+    let options = ContentSetDiffOptions {
+        removed_disabled_project_ids: removed_disabled_project_ids.clone(),
+        removed_disabled_external_files: removed_disabled_external_files
+            .clone(),
+        common_external_files_are_updated,
+    };
+    let content_diffs = diff_content_sets(&current, &latest, &options);
+    let project_ids = content_diffs
+        .iter()
+        .filter_map(|diff| match diff {
+            ContentSetDiffEntry::Project { project_id, .. } => {
+                Some(project_id.clone())
+            }
+            ContentSetDiffEntry::ExternalFile { .. } => None,
+        })
+        .collect::<HashSet<_>>();
+    let project_names = shared_project_names(&project_ids, state).await?;
+
+    let mut diffs = Vec::new();
+    for diff in content_diffs {
+        match diff {
+            ContentSetDiffEntry::Project {
+                kind,
+                project_id,
+                current_version_name,
+                new_version_name,
+                disabled,
+            } => {
+                let project_name = Some(
+                    project_names
+                        .get(&project_id)
+                        .cloned()
+                        .unwrap_or_else(|| project_id.clone()),
+                );
+                diffs.push(SharedInstanceUpdateDiff {
+                    type_: shared_update_diff_type(kind),
+                    project_id: Some(project_id),
+                    project_name,
+                    file_name: None,
+                    current_version_name,
+                    new_version_name,
+                    config_file_count: None,
+                    disabled,
+                });
+            }
+            ContentSetDiffEntry::ExternalFile {
+                kind,
+                file_name,
+                disabled,
+            } => {
+                diffs.push(SharedInstanceUpdateDiff {
+                    type_: shared_update_diff_type(kind),
+                    project_id: None,
+                    project_name: None,
+                    file_name: Some(file_name),
+                    current_version_name: None,
+                    new_version_name: None,
+                    config_file_count: None,
+                    disabled,
+                });
+            }
+        }
+    }
+
+    diffs.sort_by(|a, b| {
+        a.project_name
+            .as_deref()
+            .or(a.file_name.as_deref())
+            .cmp(&b.project_name.as_deref().or(b.file_name.as_deref()))
+    });
+    Ok(diffs)
+}
+
+pub(super) fn shared_update_diff_type(
+    kind: ContentSetDiffKind,
+) -> SharedInstanceUpdateDiffType {
+    match kind {
+        ContentSetDiffKind::Added => SharedInstanceUpdateDiffType::Added,
+        ContentSetDiffKind::Removed => SharedInstanceUpdateDiffType::Removed,
+        ContentSetDiffKind::Updated => SharedInstanceUpdateDiffType::Updated,
+    }
+}
+
+pub(super) async fn shared_content_snapshot(
+    version_ids: &[String],
+    external_files: &HashSet<String>,
+    state: &State,
+) -> crate::Result<ContentSetSnapshot> {
+    let versions = shared_versions_by_project(version_ids, state)
+        .await?
+        .into_values()
+        .map(ContentSetSnapshotVersion::from)
+        .collect();
+
+    Ok(ContentSetSnapshot {
+        versions,
+        external_files: external_files.clone(),
+    })
+}
+
+pub(super) fn remote_shared_content(
+    version: &InstanceVersionResponse,
+) -> (Vec<String>, HashSet<String>) {
+    let mut version_ids = version.modrinth_ids.clone();
+    if let Some(modpack_id) = version.modpack_id.as_deref() {
+        version_ids.retain(|id| id != modpack_id);
+    }
+    dedupe_strings(&mut version_ids);
+
+    (
+        version_ids,
+        version
+            .external_files
+            .iter()
+            .filter(|file| file.file_type != CONFIG_BUNDLE_FILE_TYPE)
+            .map(|file| file.file_name.clone())
+            .collect(),
+    )
+}
diff --git a/packages/app-lib/src/api/instance/shared/install.rs b/packages/app-lib/src/api/instance/shared/install.rs
new file mode 100644
index 000000000..85a82a809
--- /dev/null
+++ b/packages/app-lib/src/api/instance/shared/install.rs
@@ -0,0 +1,574 @@
+use super::client::*;
+use super::diff::*;
+use super::publish::*;
+use super::types::*;
+use super::*;
+
+#[tracing::instrument]
+pub async fn install_shared_instance(
+    shared_instance_id: &str,
+    name: String,
+    manager_id: Option<String>,
+    server_manager_name: Option<String>,
+    server_manager_icon_url: Option<String>,
+    instance_icon_url: Option<String>,
+) -> crate::Result<InstallJobSnapshot> {
+    let state = State::get().await?;
+    let version = get_latest_remote_version(shared_instance_id, &state).await?;
+    let data = shared_instance_install_data(
+        shared_instance_id,
+        manager_id,
+        server_manager_name,
+        server_manager_icon_url,
+        instance_icon_url,
+        name,
+        version,
+        &state,
+    )
+    .await?;
+
+    crate::install::create_shared_instance(data).await
+}
+
+pub(super) fn shared_instance_invite_install_name(
+    shared_instance_id: &str,
+    name: String,
+) -> String {
+    let name = name.trim();
+    if name.is_empty() || name == "Shared instance" {
+        return format!("Shared instance {shared_instance_id}");
+    }
+
+    name.to_string()
+}
+
+#[tracing::instrument]
+pub async fn get_shared_instance_install_preview(
+    shared_instance_id: &str,
+    name: String,
+) -> crate::Result<SharedInstanceInstallPreview> {
+    let state = State::get().await?;
+    let version = get_latest_remote_version(shared_instance_id, &state).await?;
+    shared_instance_install_preview_from_version(
+        shared_instance_id.to_string(),
+        name,
+        version,
+        &state,
+    )
+    .await
+}
+
+#[tracing::instrument(skip(invite_id))]
+pub async fn accept_shared_instance_invite_for_install(
+    invite_id: &str,
+) -> crate::Result<SharedInstanceInviteInstallPreview> {
+    let state = State::get().await?;
+    let invite = get_shared_instance_invite_info(invite_id, &state).await?;
+    let shared_instance_id = invite.instance_id;
+    let instance_icon_url = invite.instance_icon;
+    let (manager_id, server_manager_name, server_manager_icon_url) =
+        shared_instance_invite_manager(invite.managers);
+    let name = shared_instance_invite_install_name(
+        &shared_instance_id,
+        invite.instance_name,
+    );
+    accept_shared_instance_invite(&shared_instance_id, invite_id, &state)
+        .await?;
+    let version =
+        get_latest_remote_version(&shared_instance_id, &state).await?;
+    let mut preview = shared_instance_install_preview_from_version(
+        shared_instance_id.clone(),
+        name,
+        version,
+        &state,
+    )
+    .await?;
+    if instance_icon_url.is_some() {
+        preview.icon_url.clone_from(&instance_icon_url);
+    }
+
+    Ok(SharedInstanceInviteInstallPreview {
+        shared_instance_id,
+        manager_id,
+        server_manager_name,
+        server_manager_icon_url,
+        instance_icon_url,
+        preview,
+    })
+}
+
+pub(super) fn shared_instance_invite_manager(
+    managers: Vec<InstanceInviteManagerResponse>,
+) -> (Option<String>, Option<String>, Option<String>) {
+    match managers.into_iter().next() {
+        Some(InstanceInviteManagerResponse::User { id }) => {
+            (Some(id), None, None)
+        }
+        Some(InstanceInviteManagerResponse::Server { name, icon }) => {
+            (None, Some(name), icon)
+        }
+        None => (None, None, None),
+    }
+}
+
+pub(super) async fn shared_instance_install_preview_from_version(
+    shared_instance_id: String,
+    name: String,
+    version: InstanceVersionResponse,
+    state: &State,
+) -> crate::Result<SharedInstanceInstallPreview> {
+    let name = match name.trim() {
+        "" => "Shared instance".to_string(),
+        name => name.to_string(),
+    };
+    let mut content_version_ids = version.modrinth_ids.clone();
+    let mut seen_content_version_ids = HashSet::new();
+    content_version_ids
+        .retain(|id| seen_content_version_ids.insert(id.clone()));
+    let modpack = shared_instance_install_modpack(&version, state).await?;
+    let modpack_dependency_count = modpack
+        .as_ref()
+        .map(|modpack| modpack.dependency_count)
+        .unwrap_or_default();
+    let modpack_version_id =
+        modpack.as_ref().map(|modpack| modpack.version_id.clone());
+    if let Some(modpack_version_id) = modpack_version_id.as_deref() {
+        content_version_ids.retain(|id| id != modpack_version_id);
+    }
+    let icon_url = modpack
+        .as_ref()
+        .and_then(|modpack| modpack.icon_url.clone());
+
+    let external_files = version
+        .external_files
+        .iter()
+        .filter(|file| file.file_type != CONFIG_BUNDLE_FILE_TYPE)
+        .map(|file| SharedInstanceExternalFilePreview {
+            file_name: file.file_name.clone(),
+            file_type: file.file_type.clone(),
+        })
+        .collect::<Vec<_>>();
+    let external_file_count = external_files.len();
+
+    Ok(SharedInstanceInstallPreview {
+        shared_instance_id,
+        version: version.version,
+        name,
+        icon_url,
+        game_version: version.game_version,
+        loader: version.loader,
+        mod_count: modpack_dependency_count
+            + content_version_ids.len()
+            + external_file_count,
+        external_file_count,
+        modpack_version_id,
+        content_version_ids,
+        external_files,
+    })
+}
+
+#[tracing::instrument]
+pub async fn get_shared_instance_update_preview(
+    instance_id: &str,
+) -> crate::Result<Option<SharedInstanceUpdatePreview>> {
+    let state = State::get().await?;
+    let metadata = crate::state::get_instance(instance_id, &state.pool)
+        .await?
+        .ok_or_else(|| {
+            crate::ErrorKind::InputError("Unknown instance".to_string())
+        })?;
+    let Some(attachment) = metadata.shared_instance.clone() else {
+        return Ok(None);
+    };
+    if !attachment.role.is_member() {
+        if let SharedInstanceRemoteResponse::Unavailable(reason) =
+            get_remote_instance_access(&attachment.id, &state).await?
+        {
+            handle_unavailable_shared_instance_if_current_user(
+                instance_id,
+                &attachment,
+                reason,
+                &state,
+            )
+            .await?;
+            return Err(shared_instance_unavailable_error(reason));
+        }
+
+        return Ok(None);
+    }
+
+    let version =
+        get_latest_remote_member_version(instance_id, &attachment, &state)
+            .await?;
+    if !version.ready {
+        return Ok(Some(SharedInstanceUpdatePreview {
+            shared_instance_id: attachment.id,
+            current_version: attachment.applied_version,
+            latest_version: version.version,
+            update_available: false,
+            diffs: Vec::new(),
+        }));
+    }
+
+    let update_available = attachment
+        .applied_version
+        .is_none_or(|current| current < version.version);
+    let diffs = if update_available {
+        shared_instance_update_diffs(&metadata, &version, &state).await?
+    } else {
+        Vec::new()
+    };
+
+    Ok(Some(SharedInstanceUpdatePreview {
+        shared_instance_id: attachment.id,
+        current_version: attachment.applied_version,
+        latest_version: version.version,
+        update_available,
+        diffs,
+    }))
+}
+
+pub(crate) async fn check_shared_instance_availability_before_launch(
+    instance_id: &str,
+    state: &State,
+) -> crate::Result<()> {
+    let metadata = crate::state::get_instance(instance_id, &state.pool)
+        .await?
+        .ok_or_else(|| {
+            crate::ErrorKind::InputError("Unknown instance".to_string())
+        })?;
+    let Some(attachment) = metadata.shared_instance else {
+        return Ok(());
+    };
+
+    let availability =
+        match get_remote_instance_access(&attachment.id, state).await {
+            Ok(availability) => availability,
+            Err(error)
+                if matches!(
+                    error.raw.as_ref(),
+                    crate::ErrorKind::NoCredentialsError
+                        | crate::ErrorKind::FetchError(_)
+                ) =>
+            {
+                tracing::warn!(
+                    instance_id,
+                    shared_instance_id = %attachment.id,
+                    error = %error,
+                    "Could not check shared instance availability before launch"
+                );
+                return Ok(());
+            }
+            Err(error) => return Err(error),
+        };
+
+    if let SharedInstanceRemoteResponse::Unavailable(reason) = availability {
+        handle_unavailable_shared_instance_if_current_user(
+            instance_id,
+            &attachment,
+            reason,
+            state,
+        )
+        .await?;
+        return Err(shared_instance_unavailable_error(reason));
+    }
+
+    Ok(())
+}
+
+#[tracing::instrument]
+pub async fn update_shared_instance(
+    instance_id: &str,
+) -> crate::Result<InstallJobSnapshot> {
+    let state = State::get().await?;
+    let metadata = crate::state::get_instance(instance_id, &state.pool)
+        .await?
+        .ok_or_else(|| {
+            crate::ErrorKind::InputError("Unknown instance".to_string())
+        })?;
+    let attachment = metadata.shared_instance.clone().ok_or_else(|| {
+        crate::ErrorKind::InputError(
+            "Instance is not attached to a shared instance".to_string(),
+        )
+    })?;
+    if !attachment.role.is_member() {
+        return Err(crate::ErrorKind::InputError(
+            "Only shared instance members can update from shared instances"
+                .to_string(),
+        )
+        .into());
+    }
+
+    let version =
+        get_latest_remote_member_version(instance_id, &attachment, &state)
+            .await?;
+    let data = shared_instance_install_data(
+        &attachment.id,
+        attachment.manager_id.clone(),
+        attachment.server_manager_name.clone(),
+        attachment.server_manager_icon_url.clone(),
+        None,
+        metadata.instance.name,
+        version,
+        &state,
+    )
+    .await?;
+    crate::install::update_shared_instance(instance_id.to_string(), data).await
+}
+
+pub(super) async fn ensure_ready_remote_version_for_invite(
+    instance_id: &str,
+    attachment: &SharedInstanceAttachment,
+    state: &State,
+) -> crate::Result<()> {
+    match get_latest_remote_version_optional_unavailable(&attachment.id, state)
+        .await?
+    {
+        SharedInstanceRemoteResponse::Available(_) => Ok(()),
+        SharedInstanceRemoteResponse::Unavailable(
+            SharedInstanceUnavailableReason::Deleted,
+        ) => {
+            tracing::info!(
+                instance_id,
+                shared_instance_id = %attachment.id,
+                "Shared instance has no ready version before invite; publishing current content"
+            );
+            publish_shared_instance_inner(instance_id, &[], state).await
+        }
+        SharedInstanceRemoteResponse::Unavailable(reason) => {
+            handle_unavailable_shared_instance_if_current_user(
+                instance_id,
+                attachment,
+                reason,
+                state,
+            )
+            .await?;
+            Err(shared_instance_unavailable_error(reason))
+        }
+    }
+}
+
+pub(super) async fn get_latest_remote_member_version(
+    instance_id: &str,
+    attachment: &SharedInstanceAttachment,
+    state: &State,
+) -> crate::Result<InstanceVersionResponse> {
+    if let SharedInstanceRemoteResponse::Unavailable(reason) =
+        get_remote_instance_access(&attachment.id, state).await?
+    {
+        if shared_attachment_matches_current_user(attachment, state).await? {
+            handle_unavailable_shared_instance_if_current_user(
+                instance_id,
+                attachment,
+                reason,
+                state,
+            )
+            .await?;
+            return Err(shared_instance_unavailable_error(reason));
+        }
+
+        return Err(crate::ErrorKind::OtherError(format!(
+            "{}: {}",
+            shared_instance_unavailable_message(reason),
+            attachment.id
+        ))
+        .into());
+    }
+
+    let version = match get_latest_remote_version_optional_unavailable(
+        &attachment.id,
+        state,
+    )
+    .await?
+    {
+        SharedInstanceRemoteResponse::Available(version) => version,
+        SharedInstanceRemoteResponse::Unavailable(reason) => {
+            if shared_attachment_matches_current_user(attachment, state).await?
+            {
+                handle_unavailable_shared_instance_if_current_user(
+                    instance_id,
+                    attachment,
+                    reason,
+                    state,
+                )
+                .await?;
+                return Err(shared_instance_unavailable_error(reason));
+            }
+
+            return Err(crate::ErrorKind::OtherError(format!(
+                "{}: {}",
+                shared_instance_unavailable_message(reason),
+                attachment.id
+            ))
+            .into());
+        }
+    };
+
+    Ok(version)
+}
+
+pub(super) async fn shared_attachment_matches_current_user(
+    attachment: &SharedInstanceAttachment,
+    state: &State,
+) -> crate::Result<bool> {
+    let Some(linked_user_id) = attachment.linked_user_id.as_deref() else {
+        return Ok(false);
+    };
+
+    Ok(linked_modrinth_user_id(state)
+        .await?
+        .as_deref()
+        .is_some_and(|current_user_id| current_user_id == linked_user_id))
+}
+
+pub(super) async fn has_shared_instance_recipients(
+    users: &SharedInstanceUsers,
+    attachment: &SharedInstanceAttachment,
+    has_pending_recipients: bool,
+    state: &State,
+) -> crate::Result<bool> {
+    if has_pending_recipients || users.tokens > 0 {
+        return Ok(true);
+    }
+
+    let current_user_id = linked_modrinth_user_id(state).await?;
+
+    Ok(users.user_ids.iter().any(|user_id| {
+        Some(user_id.as_str()) != attachment.linked_user_id.as_deref()
+            && Some(user_id.as_str()) != attachment.manager_id.as_deref()
+            && Some(user_id.as_str()) != current_user_id.as_deref()
+    }))
+}
+
+pub(super) async fn handle_unavailable_shared_instance_if_current_user(
+    instance_id: &str,
+    attachment: &SharedInstanceAttachment,
+    reason: SharedInstanceUnavailableReason,
+    state: &State,
+) -> crate::Result<()> {
+    if reason != SharedInstanceUnavailableReason::Quarantined
+        && !shared_attachment_matches_current_user(attachment, state).await?
+    {
+        return Ok(());
+    }
+
+    match reason {
+        SharedInstanceUnavailableReason::Quarantined => {
+            crate::state::quarantine_shared_instance(instance_id, &state.pool)
+                .await?;
+        }
+        _ => {
+            crate::state::clear_shared_instance(instance_id, &state.pool)
+                .await?;
+        }
+    }
+    emit_instance(instance_id, InstancePayloadType::Edited).await?;
+
+    Ok(())
+}
+
+pub(super) fn shared_instance_unavailable_error(
+    reason: SharedInstanceUnavailableReason,
+) -> crate::Error {
+    crate::ErrorKind::SharedInstanceUnavailable(reason).into()
+}
+
+pub(super) fn shared_instance_unavailable_message(
+    reason: SharedInstanceUnavailableReason,
+) -> &'static str {
+    match reason {
+        SharedInstanceUnavailableReason::Deleted => {
+            "Shared instance was deleted"
+        }
+        SharedInstanceUnavailableReason::AccessRevoked => {
+            "Shared instance access was revoked"
+        }
+        SharedInstanceUnavailableReason::Quarantined => {
+            "Shared instance was quarantined"
+        }
+    }
+}
+
+fn shared_instance_external_file_data(
+    file: ExternalFileResponse,
+) -> crate::Result<SharedInstanceExternalFileData> {
+    let file_size = file.file_size.ok_or_else(|| {
+        crate::ErrorKind::InputError(format!(
+            "Shared instance external file {} is missing its size",
+            file.file_name
+        ))
+    })?;
+    let file_size = u64::try_from(file_size).map_err(|_| {
+        crate::ErrorKind::InputError(format!(
+            "Shared instance external file {} has an invalid size",
+            file.file_name
+        ))
+    })?;
+
+    Ok(SharedInstanceExternalFileData {
+        file_name: file.file_name,
+        file_type: file.file_type,
+        url: file.url,
+        file_size,
+    })
+}
+
+pub(super) async fn shared_instance_install_data(
+    shared_instance_id: &str,
+    manager_id: Option<String>,
+    server_manager_name: Option<String>,
+    server_manager_icon_url: Option<String>,
+    instance_icon_url: Option<String>,
+    name: String,
+    version: InstanceVersionResponse,
+    state: &State,
+) -> crate::Result<SharedInstanceInstallData> {
+    if !version.ready {
+        return Err(crate::ErrorKind::InputError(
+            "Shared instance version is not ready to install".to_string(),
+        )
+        .into());
+    }
+
+    let name = shared_instance_name(name);
+    let linked_user_id = linked_modrinth_user_id(state).await?;
+    let modpack = shared_instance_install_modpack(&version, state).await?;
+    let modpack_version_id =
+        modpack.as_ref().map(|modpack| modpack.version_id.as_str());
+    let modrinth_ids = version
+        .modrinth_ids
+        .into_iter()
+        .filter(|id| Some(id.as_str()) != modpack_version_id)
+        .collect();
+
+    Ok(SharedInstanceInstallData {
+        shared_instance_id: shared_instance_id.to_string(),
+        manager_id,
+        server_manager_name,
+        server_manager_icon_url,
+        instance_icon_url,
+        linked_user_id,
+        name,
+        version: version.version,
+        modrinth_ids,
+        external_files: version
+            .external_files
+            .into_iter()
+            .map(shared_instance_external_file_data)
+            .collect::<crate::Result<Vec<_>>>()?,
+        modpack,
+        game_version: version.game_version,
+        loader: version.loader,
+        loader_version: shared_instance_loader_version(version.loader_version),
+    })
+}
+
+pub(super) async fn linked_modrinth_user_id(
+    state: &State,
+) -> crate::Result<Option<String>> {
+    Ok(
+        ModrinthCredentials::get_and_refresh(&state.pool, &state.api_semaphore)
+            .await?
+            .map(|credentials| credentials.user_id),
+    )
+}
diff --git a/packages/app-lib/src/api/instance/shared/invites.rs b/packages/app-lib/src/api/instance/shared/invites.rs
new file mode 100644
index 000000000..d70f68901
--- /dev/null
+++ b/packages/app-lib/src/api/instance/shared/invites.rs
@@ -0,0 +1,184 @@
+const SHARED_INSTANCE_INVITE_MAX_AGE_SECONDS: i32 = 604800;
+const SHARED_INSTANCE_INVITE_MAX_USES: i32 = 10;
+
+use super::client::*;
+use super::install::*;
+use super::publish::*;
+use super::types::*;
+use super::*;
+
+#[tracing::instrument]
+pub async fn get_shared_instance_users(
+    instance_id: &str,
+) -> crate::Result<SharedInstanceUsers> {
+    let state = State::get().await?;
+    let Some(attachment) = shared_attachment(instance_id, &state).await? else {
+        return Ok(SharedInstanceUsers::empty());
+    };
+
+    get_remote_users(&attachment.id, &state).await
+}
+
+#[tracing::instrument]
+pub async fn invite_shared_instance_users(
+    instance_id: &str,
+    user_ids: Vec<String>,
+) -> crate::Result<SharedInstanceUsers> {
+    let state = State::get().await?;
+    let (metadata, attachment) =
+        shared_instance_for_invites(instance_id, user_ids.len(), &state)
+            .await?;
+
+    ensure_owner(&attachment)?;
+    if !user_ids.is_empty() {
+        ensure_ready_remote_version_for_invite(
+            instance_id,
+            &attachment,
+            &state,
+        )
+        .await?;
+        update_remote_instance(
+            &attachment.id,
+            shared_instance_name(metadata.instance.name.clone()),
+            &state,
+        )
+        .await?;
+        tracing::info!(
+            instance_id,
+            shared_instance_id = %attachment.id,
+            user_count = user_ids.len(),
+            "Adding users to shared instance"
+        );
+        add_remote_users(&attachment.id, user_ids.clone(), &state).await?;
+    }
+    emit_instance(instance_id, InstancePayloadType::Edited).await?;
+
+    get_remote_users(&attachment.id, &state).await
+}
+
+#[tracing::instrument(skip(replace_invite_id))]
+pub async fn create_shared_instance_invite_link(
+    instance_id: &str,
+    max_age_seconds: Option<i32>,
+    max_uses: Option<i32>,
+    replace_invite_id: Option<String>,
+) -> crate::Result<SharedInstanceInviteLink> {
+    let state = State::get().await?;
+    let (metadata, attachment) =
+        shared_instance_for_invites(instance_id, 0, &state).await?;
+    ensure_owner(&attachment)?;
+    ensure_ready_remote_version_for_invite(instance_id, &attachment, &state)
+        .await?;
+    update_remote_instance(
+        &attachment.id,
+        shared_instance_name(metadata.instance.name),
+        &state,
+    )
+    .await?;
+
+    let max_age_seconds =
+        max_age_seconds.unwrap_or(SHARED_INSTANCE_INVITE_MAX_AGE_SECONDS);
+    let max_uses = max_uses.unwrap_or(SHARED_INSTANCE_INVITE_MAX_USES);
+    if max_age_seconds <= 0
+        || max_age_seconds > SHARED_INSTANCE_INVITE_MAX_AGE_SECONDS
+    {
+        return Err(crate::ErrorKind::InputError(
+            "Invite expiry must be between now and seven days".to_string(),
+        )
+        .into());
+    }
+    if max_uses <= 0 {
+        return Err(crate::ErrorKind::InputError(
+            "Invite max uses must be greater than zero".to_string(),
+        )
+        .into());
+    }
+
+    if let Some(invite_id) = replace_invite_id {
+        delete_remote_invite(&attachment.id, &invite_id, &state).await?;
+    }
+
+    let created_at = Utc::now();
+
+    let response = request_json::<CreateInstanceInviteResponse>(
+        "create_instance_invite",
+        Method::POST,
+        &format!("/instances/{}/invites", attachment.id),
+        Some(json!({
+            "max_age": max_age_seconds,
+            "max_uses": max_uses,
+        })),
+        &state,
+    )
+    .await?;
+
+    emit_instance(instance_id, InstancePayloadType::Edited).await?;
+
+    Ok(SharedInstanceInviteLink {
+        invite_id: response.id,
+        expires_at: created_at
+            + chrono::Duration::seconds(i64::from(max_age_seconds)),
+        max_uses,
+    })
+}
+
+#[tracing::instrument]
+pub async fn remove_shared_instance_users(
+    instance_id: &str,
+    user_ids: Vec<String>,
+    has_pending_recipients: bool,
+) -> crate::Result<SharedInstanceUsers> {
+    let state = State::get().await?;
+    let Some(attachment) = shared_attachment(instance_id, &state).await? else {
+        return Ok(SharedInstanceUsers::empty());
+    };
+    ensure_owner(&attachment)?;
+
+    if !user_ids.is_empty() {
+        remove_remote_users(&attachment.id, user_ids, &state).await?;
+    }
+
+    let remaining_users = get_remote_users(&attachment.id, &state).await?;
+    if !has_shared_instance_recipients(
+        &remaining_users,
+        &attachment,
+        has_pending_recipients,
+        &state,
+    )
+    .await?
+    {
+        delete_remote_instance(&attachment.id, &state).await?;
+        crate::state::clear_shared_instance(instance_id, &state.pool).await?;
+        emit_instance(instance_id, InstancePayloadType::Edited).await?;
+
+        return Ok(SharedInstanceUsers::empty());
+    }
+
+    emit_instance(instance_id, InstancePayloadType::Edited).await?;
+
+    Ok(remaining_users)
+}
+
+#[tracing::instrument]
+pub async fn accept_pending_shared_instance_invite(
+    shared_instance_id: &str,
+) -> crate::Result<()> {
+    let state = State::get().await?;
+
+    if accept_pending_remote_invite(shared_instance_id, &state).await? {
+        return Ok(());
+    }
+
+    Err(crate::ErrorKind::InputError(
+        "No pending invite found for shared instance".to_string(),
+    )
+    .into())
+}
+
+#[tracing::instrument]
+pub async fn decline_pending_shared_instance_invite(
+    shared_instance_id: &str,
+) -> crate::Result<()> {
+    let state = State::get().await?;
+    decline_pending_remote_invite(shared_instance_id, &state).await
+}
diff --git a/packages/app-lib/src/api/instance/shared/mod.rs b/packages/app-lib/src/api/instance/shared/mod.rs
new file mode 100644
index 000000000..5ebb1a13d
--- /dev/null
+++ b/packages/app-lib/src/api/instance/shared/mod.rs
@@ -0,0 +1,140 @@
+use super::content_set_diff::{
+    ContentSetDiffEntry, ContentSetDiffKind, ContentSetDiffOptions,
+    ContentSetSnapshot, ContentSetSnapshotVersion, diff_content_sets,
+};
+use crate::SharedInstanceUnavailableReason;
+use crate::event::InstancePayloadType;
+use crate::event::emit::emit_instance;
+use crate::install::{
+    InstallJobSnapshot, SharedInstanceExternalFileData,
+    SharedInstanceInstallData,
+};
+use crate::state::instances::{InstanceLink, SharedInstanceAttachment};
+use crate::state::{
+    AppliedContentSetPatch, CacheBehaviour, CachedEntry, ContentSetSyncStatus,
+    ContentSourceKind, EditInstance, ModLoader, ModrinthCredentials,
+    ProjectType, SharedInstanceRole, State,
+};
+use crate::util::fetch::{INSECURE_REQWEST_CLIENT, REQWEST_CLIENT};
+use chrono::{DateTime, Utc};
+use reqwest::{Method, StatusCode};
+use serde::de::DeserializeOwned;
+use serde::{Deserialize, Serialize};
+use serde_json::json;
+use std::collections::{HashMap, HashSet};
+use std::io::Read;
+
+pub(crate) const CONFIG_BUNDLE_FILE_NAME: &str = "configs.zip";
+pub(crate) const CONFIG_BUNDLE_FILE_TYPE: &str = "configs";
+pub(crate) const CONFIG_SYNC_ENABLED: bool = true;
+pub(crate) const CONFIG_DIRECTORY: &str = "config";
+pub(crate) const MAX_CONFIG_BUNDLE_ENTRIES: usize = 4096;
+pub(crate) const MAX_CONFIG_BUNDLE_FILE_SIZE: u64 = 16 * 1024 * 1024;
+pub(crate) const MAX_CONFIG_BUNDLE_TOTAL_SIZE: u64 = 128 * 1024 * 1024;
+pub(crate) const CONFIG_FILE_EXTENSIONS: [&str; 13] = [
+    "json",
+    "json5",
+    "jsonc",
+    "yml",
+    "yaml",
+    "css",
+    "toml",
+    "txt",
+    "ini",
+    "cfg",
+    "conf",
+    "properties",
+    "xml",
+];
+
+pub(crate) fn read_bounded_config_bundle_entry(
+    reader: impl Read,
+    declared_size: u64,
+    total_size: &mut u64,
+) -> crate::Result<Vec<u8>> {
+    let remaining = MAX_CONFIG_BUNDLE_TOTAL_SIZE.saturating_sub(*total_size);
+    let entry_limit = MAX_CONFIG_BUNDLE_FILE_SIZE.min(remaining);
+    if declared_size > entry_limit {
+        return Err(crate::ErrorKind::InputError(
+            "Shared instance config bundle exceeds the uncompressed size limit"
+                .to_string(),
+        )
+        .into());
+    }
+
+    let capacity = usize::try_from(declared_size).map_err(|_| {
+        crate::ErrorKind::InputError(
+            "Shared instance config bundle entry is too large".to_string(),
+        )
+    })?;
+    let mut bytes = Vec::with_capacity(capacity);
+    reader
+        .take(entry_limit.saturating_add(1))
+        .read_to_end(&mut bytes)
+        .map_err(|error| {
+            crate::ErrorKind::OtherError(format!(
+                "Failed to read shared instance config bundle: {error}"
+            ))
+        })?;
+    let actual_size = bytes.len() as u64;
+    if actual_size > entry_limit {
+        return Err(crate::ErrorKind::InputError(
+            "Shared instance config bundle exceeds the uncompressed size limit"
+                .to_string(),
+        )
+        .into());
+    }
+    *total_size = total_size.checked_add(actual_size).ok_or_else(|| {
+        crate::ErrorKind::InputError(
+            "Shared instance config bundle size overflowed".to_string(),
+        )
+    })?;
+
+    Ok(bytes)
+}
+
+mod client;
+mod diff;
+mod install;
+mod invites;
+mod publish;
+mod types;
+
+pub(crate) use self::install::check_shared_instance_availability_before_launch;
+pub(crate) use self::publish::sync_shared_instance_icon;
+
+pub use self::install::{
+    accept_shared_instance_invite_for_install,
+    get_shared_instance_install_preview, get_shared_instance_update_preview,
+    install_shared_instance, update_shared_instance,
+};
+pub use self::invites::{
+    accept_pending_shared_instance_invite, create_shared_instance_invite_link,
+    decline_pending_shared_instance_invite, get_shared_instance_users,
+    invite_shared_instance_users, remove_shared_instance_users,
+};
+pub use self::publish::{
+    get_shared_instance_publish_preview, publish_shared_instance,
+    unlink_shared_instance, unpublish_shared_instance,
+};
+pub use self::types::{
+    SharedInstanceExternalFilePreview, SharedInstanceInstallPreview,
+    SharedInstanceInviteInstallPreview, SharedInstanceInviteLink,
+    SharedInstanceJoinType, SharedInstancePublishPreview,
+    SharedInstanceUpdateDiff, SharedInstanceUpdateDiffType,
+    SharedInstanceUpdatePreview, SharedInstanceUser, SharedInstanceUsers,
+};
+
+pub async fn can_active_user_use_shared_instances() -> crate::Result<bool> {
+    let state = State::get().await?;
+    let Some(credentials) =
+        ModrinthCredentials::get_and_refresh(&state.pool, &state.api_semaphore)
+            .await?
+    else {
+        return Ok(true);
+    };
+
+    let status =
+        client::get_user_blacklist_status(&credentials.user_id, &state).await?;
+    Ok(!status.blacklisted)
+}
diff --git a/packages/app-lib/src/api/instance/shared/publish.rs b/packages/app-lib/src/api/instance/shared/publish.rs
new file mode 100644
index 000000000..b3af7666b
--- /dev/null
+++ b/packages/app-lib/src/api/instance/shared/publish.rs
@@ -0,0 +1,1163 @@
+use super::client::*;
+use super::diff::*;
+use super::install::*;
+use super::types::*;
+use super::*;
+use async_walkdir::WalkDir;
+use async_zip::{Compression, ZipEntryBuilder};
+use futures::StreamExt;
+use std::collections::BTreeMap;
+
+#[tracing::instrument]
+pub async fn unpublish_shared_instance(instance_id: &str) -> crate::Result<()> {
+    let state = State::get().await?;
+    let metadata = crate::state::get_instance(instance_id, &state.pool)
+        .await?
+        .ok_or_else(|| {
+            crate::ErrorKind::InputError("Unknown instance".to_string())
+        })?;
+    let Some(attachment) = metadata.shared_instance.clone() else {
+        return Ok(());
+    };
+    ensure_owner(&attachment)?;
+
+    delete_remote_instance(&attachment.id, &state).await?;
+    detach_local_shared_instance(instance_id, metadata.link, &state).await?;
+    emit_instance(instance_id, InstancePayloadType::Edited).await?;
+
+    Ok(())
+}
+
+#[tracing::instrument]
+pub async fn unlink_shared_instance(instance_id: &str) -> crate::Result<()> {
+    let state = State::get().await?;
+    let metadata = crate::state::get_instance(instance_id, &state.pool)
+        .await?
+        .ok_or_else(|| {
+            crate::ErrorKind::InputError("Unknown instance".to_string())
+        })?;
+    let Some(attachment) = metadata.shared_instance.clone() else {
+        return Ok(());
+    };
+    ensure_member(&attachment)?;
+
+    detach_local_shared_instance(instance_id, metadata.link, &state).await?;
+    emit_instance(instance_id, InstancePayloadType::Edited).await?;
+
+    Ok(())
+}
+
+pub(super) async fn detach_local_shared_instance(
+    instance_id: &str,
+    link: InstanceLink,
+    state: &State,
+) -> crate::Result<()> {
+    let link_patch = match link {
+        InstanceLink::SharedInstance {
+            modpack_project_id: Some(project_id),
+            modpack_version_id: Some(version_id),
+        } => Some((
+            InstanceLink::ModrinthModpack {
+                project_id,
+                version_id,
+            },
+            ContentSourceKind::ModrinthModpack,
+        )),
+        InstanceLink::SharedInstance { .. } => {
+            Some((InstanceLink::Unmanaged, ContentSourceKind::Local))
+        }
+        _ => None,
+    };
+
+    if let Some((link, source_kind)) = link_patch {
+        crate::state::edit_instance(
+            instance_id,
+            EditInstance {
+                link: Some(link),
+                content_set_patch: Some(AppliedContentSetPatch {
+                    source_kind: Some(source_kind),
+                    ..Default::default()
+                }),
+                ..Default::default()
+            },
+            &state.pool,
+        )
+        .await?;
+    }
+
+    crate::state::clear_shared_instance(instance_id, &state.pool).await?;
+
+    Ok(())
+}
+
+#[tracing::instrument]
+pub async fn publish_shared_instance(
+    instance_id: &str,
+    config_paths: Vec<String>,
+) -> crate::Result<SharedInstanceAttachment> {
+    let state = State::get().await?;
+    publish_shared_instance_inner(instance_id, &config_paths, &state).await?;
+    emit_instance(instance_id, InstancePayloadType::Edited).await?;
+
+    shared_attachment(instance_id, &state)
+        .await?
+        .ok_or_else(|| {
+            crate::ErrorKind::InputError(
+                "Shared instance attachment was not persisted".to_string(),
+            )
+            .into()
+        })
+}
+
+#[tracing::instrument]
+pub async fn get_shared_instance_publish_preview(
+    instance_id: &str,
+) -> crate::Result<Option<SharedInstancePublishPreview>> {
+    let state = State::get().await?;
+    let metadata = crate::state::get_instance(instance_id, &state.pool)
+        .await?
+        .ok_or_else(|| {
+            crate::ErrorKind::InputError("Unknown instance".to_string())
+        })?;
+    let Some(attachment) = metadata.shared_instance.clone() else {
+        return Ok(None);
+    };
+    ensure_owner(&attachment)?;
+
+    let (version, snapshot) = tokio::try_join!(
+        get_latest_remote_version_optional_unavailable(&attachment.id, &state,),
+        collect_publish_snapshot(&metadata, &state),
+    )?;
+    let version = match version {
+        SharedInstanceRemoteResponse::Available(version) => version,
+        SharedInstanceRemoteResponse::Unavailable(reason) => {
+            handle_unavailable_shared_instance_if_current_user(
+                instance_id,
+                &attachment,
+                reason,
+                &state,
+            )
+            .await?;
+            return Err(shared_instance_unavailable_error(reason));
+        }
+    };
+    let diffs =
+        shared_instance_publish_diffs(&metadata, &version, &snapshot, &state)
+            .await?;
+    set_shared_instance_publish_status(
+        instance_id,
+        &attachment,
+        version.version,
+        !diffs.is_empty(),
+        &state,
+    )
+    .await?;
+    emit_instance(instance_id, InstancePayloadType::Edited).await?;
+
+    Ok(Some(SharedInstancePublishPreview {
+        shared_instance_id: attachment.id,
+        latest_version: version.version,
+        diffs,
+        config_files: snapshot
+            .config_files
+            .into_iter()
+            .map(|file| file.path)
+            .collect(),
+    }))
+}
+
+pub(super) async fn remote_publish_content(
+    version: &InstanceVersionResponse,
+    include_modpack_dependencies: bool,
+    state: &State,
+) -> crate::Result<(Vec<String>, HashSet<String>)> {
+    let mut version_ids = version.modrinth_ids.clone();
+    if let Some(modpack_id) =
+        version.modpack_id.as_deref().filter(|id| !id.is_empty())
+    {
+        version_ids.retain(|id| id != modpack_id);
+
+        if include_modpack_dependencies {
+            version_ids.extend(
+                modpack_dependency_version_ids(modpack_id, state).await?,
+            );
+        }
+    }
+    dedupe_strings(&mut version_ids);
+
+    Ok((
+        version_ids,
+        version
+            .external_files
+            .iter()
+            .filter(|file| file.file_type != CONFIG_BUNDLE_FILE_TYPE)
+            .map(|file| file.file_name.clone())
+            .collect(),
+    ))
+}
+
+pub(super) async fn modpack_dependency_version_ids(
+    modpack_id: &str,
+    state: &State,
+) -> crate::Result<Vec<String>> {
+    let modpack_version = CachedEntry::get_version(
+        modpack_id,
+        Some(CacheBehaviour::Bypass),
+        &state.pool,
+        &state.api_semaphore,
+    )
+    .await?
+    .ok_or_else(|| {
+        crate::ErrorKind::InputError(
+            "Shared instance modpack version was not found".to_string(),
+        )
+    })?;
+
+    Ok(modpack_version
+        .dependencies
+        .into_iter()
+        .filter_map(|dependency| dependency.version_id)
+        .collect())
+}
+
+pub(super) async fn shared_instance_install_modpack(
+    version: &InstanceVersionResponse,
+    state: &State,
+) -> crate::Result<Option<crate::install::SharedInstanceInstallModpack>> {
+    let Some(modpack_id) =
+        version.modpack_id.as_deref().filter(|id| !id.is_empty())
+    else {
+        return Ok(None);
+    };
+    let modpack_version = CachedEntry::get_version(
+        modpack_id,
+        Some(CacheBehaviour::MustRevalidate),
+        &state.pool,
+        &state.api_semaphore,
+    )
+    .await?
+    .ok_or_else(|| {
+        crate::ErrorKind::InputError(
+            "Shared instance modpack version was not found".to_string(),
+        )
+    })?;
+    let project = CachedEntry::get_project(
+        &modpack_version.project_id,
+        Some(CacheBehaviour::MustRevalidate),
+        &state.pool,
+        &state.api_semaphore,
+    )
+    .await?;
+
+    Ok(Some(crate::install::SharedInstanceInstallModpack {
+        project_id: modpack_version.project_id,
+        version_id: modpack_version.id,
+        dependency_count: modpack_version.dependencies.len(),
+        title: project
+            .as_ref()
+            .map(|project| project.title.clone())
+            .unwrap_or(modpack_version.name),
+        icon_url: project.and_then(|project| project.icon_url),
+    }))
+}
+
+pub(super) fn shared_instance_loader_version(
+    loader_version: String,
+) -> Option<String> {
+    (!loader_version.is_empty()).then_some(loader_version)
+}
+
+pub(super) async fn current_shared_content(
+    metadata: &crate::state::InstanceMetadata,
+    include_linked_modpack_content: bool,
+    state: &State,
+) -> crate::Result<(Vec<String>, HashSet<String>)> {
+    let entries =
+        crate::state::instances::adapters::sqlite::content_rows::get_content_entries(
+            &metadata.applied_content_set.id,
+            &state.pool,
+        )
+        .await?;
+    let files = crate::state::instances::adapters::sqlite::content_rows::get_instance_files(
+        &metadata.instance.id,
+        &state.pool,
+    )
+    .await?
+    .into_iter()
+    .map(|file| (file.id.clone(), file))
+    .collect::<HashMap<_, _>>();
+    let mut version_ids = Vec::new();
+    let mut external_files = HashSet::new();
+
+    for entry in entries {
+        let include_entry = entry.source_kind
+            == crate::state::ContentSourceKind::SharedInstance
+            || (include_linked_modpack_content
+                && entry.source_kind
+                    == crate::state::ContentSourceKind::ModrinthModpack);
+        if !include_entry {
+            continue;
+        }
+
+        if let Some(version_id) = entry.version_id {
+            version_ids.push(version_id);
+            continue;
+        }
+
+        let Some(file_id) = entry.file_id else {
+            continue;
+        };
+        if let Some(file) = files.get(&file_id) {
+            external_files.insert(file.file_name.clone());
+        }
+    }
+    if include_linked_modpack_content
+        && let Some(modpack_id) = shared_modpack_id(&metadata.link)
+    {
+        version_ids
+            .extend(modpack_dependency_version_ids(&modpack_id, state).await?);
+    }
+    dedupe_strings(&mut version_ids);
+
+    Ok((version_ids, external_files))
+}
+
+pub(super) struct CurrentPublishSnapshot {
+    pub(super) version_ids: Vec<String>,
+    pub(super) external_files: Vec<ExternalFileCandidate>,
+    pub(super) disabled_project_ids: HashSet<String>,
+    pub(super) disabled_version_ids: Vec<String>,
+    pub(super) disabled_external_files: HashSet<String>,
+    pub(super) config_files: Vec<ConfigFile>,
+}
+
+pub(super) async fn collect_publish_snapshot(
+    metadata: &crate::state::InstanceMetadata,
+    state: &State,
+) -> crate::Result<CurrentPublishSnapshot> {
+    let instance_path = state
+        .directories
+        .instances_dir()
+        .join(&metadata.instance.path);
+    let (items, config_files) = if CONFIG_SYNC_ENABLED {
+        tokio::try_join!(
+            crate::state::list_content(
+                &metadata.instance.id,
+                None,
+                None,
+                state,
+            ),
+            collect_config_files(&instance_path),
+        )?
+    } else {
+        (
+            crate::state::list_content(
+                &metadata.instance.id,
+                None,
+                None,
+                state,
+            )
+            .await?,
+            Vec::new(),
+        )
+    };
+    let modpack_id = shared_modpack_id(&metadata.link);
+    let mut version_ids = Vec::new();
+    let mut seen_version_ids = HashSet::new();
+    let mut external_files = Vec::new();
+    let mut seen_external_files = HashSet::new();
+    let mut disabled_project_ids = HashSet::new();
+    let mut disabled_version_ids = Vec::new();
+    let mut seen_disabled_version_ids = HashSet::new();
+    let mut disabled_external_files = HashSet::new();
+
+    for item in items {
+        if item.enabled {
+            if let Some(version) = item.version {
+                if seen_version_ids.insert(version.id.clone()) {
+                    version_ids.push(version.id);
+                }
+                continue;
+            }
+
+            if item.file_path.is_empty() {
+                continue;
+            }
+
+            let file_type = file_type(item.project_type);
+            let external_key = format!("{}:{file_type}", item.file_path);
+            if seen_external_files.insert(external_key) {
+                external_files.push(ExternalFileCandidate {
+                    file_name: item.file_name,
+                    file_type,
+                    source: ExternalFileSource::InstanceFile(item.file_path),
+                });
+            }
+            continue;
+        }
+
+        let is_modpack = item.version.as_ref().is_some_and(|version| {
+            modpack_id.as_deref() == Some(version.id.as_str())
+        });
+        if is_modpack {
+            continue;
+        }
+
+        if let Some(project) = item.project.as_ref() {
+            disabled_project_ids.insert(project.id.clone());
+        }
+
+        if let Some(version) = item.version {
+            if seen_disabled_version_ids.insert(version.id.clone()) {
+                disabled_version_ids.push(version.id);
+            }
+            continue;
+        }
+
+        if item.file_path.is_empty() {
+            continue;
+        }
+
+        disabled_external_files.insert(enabled_file_name(&item.file_name));
+    }
+
+    Ok(CurrentPublishSnapshot {
+        version_ids,
+        external_files,
+        disabled_project_ids,
+        disabled_version_ids,
+        disabled_external_files,
+        config_files,
+    })
+}
+
+pub(super) async fn shared_versions_by_project(
+    version_ids: &[String],
+    state: &State,
+) -> crate::Result<HashMap<String, crate::state::Version>> {
+    let version_id_refs =
+        version_ids.iter().map(String::as_str).collect::<Vec<_>>();
+    let versions = CachedEntry::get_version_many(
+        &version_id_refs,
+        Some(CacheBehaviour::Bypass),
+        &state.pool,
+        &state.api_semaphore,
+    )
+    .await?;
+
+    Ok(versions
+        .into_iter()
+        .map(|version| (version.project_id.clone(), version))
+        .collect())
+}
+
+pub(super) async fn shared_project_names(
+    project_ids: &HashSet<String>,
+    state: &State,
+) -> crate::Result<HashMap<String, String>> {
+    let project_id_refs =
+        project_ids.iter().map(String::as_str).collect::<Vec<_>>();
+    let projects = CachedEntry::get_project_many(
+        &project_id_refs,
+        Some(CacheBehaviour::Bypass),
+        &state.pool,
+        &state.api_semaphore,
+    )
+    .await?;
+
+    Ok(projects
+        .into_iter()
+        .map(|project| (project.id, project.title))
+        .collect())
+}
+
+pub(super) fn dedupe_strings(values: &mut Vec<String>) {
+    let mut seen = HashSet::new();
+    values.retain(|value| seen.insert(value.clone()));
+}
+
+pub(super) fn enabled_file_name(file_name: &str) -> String {
+    file_name
+        .strip_suffix(".disabled")
+        .unwrap_or(file_name)
+        .to_string()
+}
+
+pub(super) fn shared_instance_name(name: String) -> String {
+    match name.trim() {
+        "" => "Shared instance".to_string(),
+        name => name.to_string(),
+    }
+}
+
+pub(super) async fn set_shared_instance_publish_status(
+    instance_id: &str,
+    attachment: &SharedInstanceAttachment,
+    latest_version: i32,
+    has_changes: bool,
+    state: &State,
+) -> crate::Result<()> {
+    let (status, applied_version) = if has_changes {
+        (ContentSetSyncStatus::Stale, attachment.applied_version)
+    } else {
+        (ContentSetSyncStatus::UpToDate, Some(latest_version))
+    };
+
+    crate::state::set_shared_instance_sync_status(
+        instance_id,
+        status,
+        applied_version,
+        Some(latest_version),
+        &state.pool,
+    )
+    .await
+}
+
+pub(super) async fn publish_shared_instance_inner(
+    instance_id: &str,
+    config_paths: &[String],
+    state: &State,
+) -> crate::Result<()> {
+    let attachment =
+        shared_attachment(instance_id, state)
+            .await?
+            .ok_or_else(|| {
+                crate::ErrorKind::InputError(
+                    "Instance is not attached to a shared instance".to_string(),
+                )
+            })?;
+    ensure_owner(&attachment)?;
+    tracing::info!(
+        instance_id,
+        shared_instance_id = %attachment.id,
+        applied_version = attachment.applied_version,
+        latest_version = attachment.latest_version,
+        "Publishing shared instance content"
+    );
+
+    crate::state::set_shared_instance_sync_status(
+        instance_id,
+        ContentSetSyncStatus::Applying,
+        attachment.applied_version,
+        attachment.latest_version,
+        &state.pool,
+    )
+    .await?;
+
+    let result = publish_current_content(
+        instance_id,
+        &attachment.id,
+        config_paths,
+        state,
+    )
+    .await;
+
+    match result {
+        Ok(version) => {
+            tracing::info!(
+                instance_id,
+                shared_instance_id = %attachment.id,
+                version,
+                "Published shared instance content"
+            );
+            crate::state::set_shared_instance_sync_status(
+                instance_id,
+                ContentSetSyncStatus::UpToDate,
+                Some(version),
+                Some(version),
+                &state.pool,
+            )
+            .await?;
+            Ok(())
+        }
+        Err(error) => {
+            tracing::warn!(
+                instance_id,
+                shared_instance_id = %attachment.id,
+                error = %error,
+                "Failed to publish shared instance content"
+            );
+            crate::state::set_shared_instance_sync_status(
+                instance_id,
+                ContentSetSyncStatus::Error,
+                attachment.applied_version,
+                attachment.latest_version,
+                &state.pool,
+            )
+            .await?;
+            Err(error)
+        }
+    }
+}
+
+pub(super) async fn publish_current_content(
+    instance_id: &str,
+    shared_instance_id: &str,
+    config_paths: &[String],
+    state: &State,
+) -> crate::Result<i32> {
+    let metadata = crate::state::get_instance(instance_id, &state.pool)
+        .await?
+        .ok_or_else(|| {
+            crate::ErrorKind::InputError("Unknown instance".to_string())
+        })?;
+    ensure_shareable_link(&metadata.link)?;
+    update_remote_instance(
+        shared_instance_id,
+        shared_instance_name(metadata.instance.name.clone()),
+        state,
+    )
+    .await?;
+    let modpack_id = shared_modpack_id(&metadata.link);
+    let snapshot = collect_publish_snapshot(&metadata, state).await?;
+    let previous_version = if CONFIG_SYNC_ENABLED
+        && metadata
+            .shared_instance
+            .as_ref()
+            .and_then(|attachment| attachment.applied_version)
+            .is_some()
+    {
+        match get_latest_remote_version_optional_unavailable(
+            shared_instance_id,
+            state,
+        )
+        .await?
+        {
+            SharedInstanceRemoteResponse::Available(version) => Some(version),
+            SharedInstanceRemoteResponse::Unavailable(_) => None,
+        }
+    } else {
+        None
+    };
+    let config_bundle = if CONFIG_SYNC_ENABLED {
+        build_config_bundle_candidate(
+            &metadata.instance.path,
+            &snapshot.config_files,
+            config_paths,
+            previous_version.as_ref(),
+            state,
+        )
+        .await?
+    } else {
+        None
+    };
+    let modrinth_ids = snapshot.version_ids;
+    let mut external_files = snapshot.external_files;
+    if let Some(config_bundle) = config_bundle {
+        external_files.push(config_bundle);
+    }
+    tracing::debug!(
+        instance_id,
+        shared_instance_id,
+        modpack_id = modpack_id.as_deref().unwrap_or("none"),
+        modrinth_id_count = modrinth_ids.len(),
+        external_file_count = external_files.len(),
+        "Creating shared instance version"
+    );
+    let external_file_data = external_files
+        .iter()
+        .map(|file| ExternalFileData {
+            file_name: file.file_name.clone(),
+            file_type: file.file_type.clone(),
+        })
+        .collect::<Vec<_>>();
+    let response = request_json_optional_unavailable::<InstanceVersionResponse>(
+        "create_instance_version",
+        Method::POST,
+        &format!("/instances/{shared_instance_id}/versions"),
+        Some(json!({
+            "modrinth_ids": modrinth_ids,
+            "external_files": external_file_data,
+            "modpack_id": modpack_id,
+            "game_version": metadata.applied_content_set.game_version.clone(),
+            "loader": metadata.applied_content_set.loader.as_str(),
+            "loader_version": metadata
+                .applied_content_set
+                .loader_version
+                .clone()
+                .unwrap_or_default(),
+        })),
+        state,
+        SharedInstancesRequestAuth::ModrinthSession,
+    )
+    .await?;
+    let response = match response {
+        SharedInstanceRemoteResponse::Available(response) => response,
+        SharedInstanceRemoteResponse::Unavailable(reason) => {
+            if let Some(attachment) = metadata.shared_instance.as_ref() {
+                handle_unavailable_shared_instance_if_current_user(
+                    instance_id,
+                    attachment,
+                    reason,
+                    state,
+                )
+                .await?;
+            }
+
+            return Err(shared_instance_unavailable_error(reason));
+        }
+    };
+
+    if !response.external_files.is_empty() {
+        upload_external_files(
+            &metadata.instance.path,
+            &external_files,
+            &response.external_files,
+            state,
+        )
+        .await?;
+    } else if !response.ready {
+        tracing::debug!(
+            "Shared instance version {} was not ready but had no external files",
+            response.version
+        );
+    }
+
+    Ok(response.version)
+}
+
+pub(super) async fn collect_config_files(
+    instance_path: &std::path::Path,
+) -> crate::Result<Vec<ConfigFile>> {
+    let config_path = instance_path.join(CONFIG_DIRECTORY);
+    crate::util::io::create_dir_all(&config_path).await?;
+    let mut files = Vec::new();
+    let mut walker = WalkDir::new(&config_path);
+
+    while let Some(entry) = walker.next().await {
+        let entry = entry.map_err(|error| {
+            crate::ErrorKind::OtherError(format!(
+                "Failed to read config directory: {error}"
+            ))
+        })?;
+        if !entry.file_type().await?.is_file()
+            || !is_supported_config_file(&entry.path())
+        {
+            continue;
+        }
+
+        let entry_path = entry.path();
+        let relative_path = entry_path.strip_prefix(&config_path)?;
+        let path = relative_path.to_string_lossy().replace('\\', "/");
+        files.push(ConfigFile { path });
+    }
+
+    files.sort_by(|left, right| left.path.cmp(&right.path));
+    Ok(files)
+}
+
+fn is_supported_config_file(path: &std::path::Path) -> bool {
+    path.extension()
+        .and_then(|extension| extension.to_str())
+        .is_some_and(|extension| {
+            CONFIG_FILE_EXTENSIONS
+                .iter()
+                .any(|candidate| extension.eq_ignore_ascii_case(candidate))
+        })
+}
+
+async fn build_config_bundle_candidate(
+    instance_path: &str,
+    local_files: &[ConfigFile],
+    selected_paths: &[String],
+    previous_version: Option<&InstanceVersionResponse>,
+    state: &State,
+) -> crate::Result<Option<ExternalFileCandidate>> {
+    let selected_paths = selected_paths
+        .iter()
+        .map(String::as_str)
+        .collect::<HashSet<_>>();
+    let local_files_by_path = local_files
+        .iter()
+        .map(|file| (file.path.as_str(), file))
+        .collect::<HashMap<_, _>>();
+    for selected_path in &selected_paths {
+        if !local_files_by_path.contains_key(selected_path) {
+            return Err(crate::ErrorKind::InputError(format!(
+                "Config file is unavailable for sharing: {selected_path}"
+            ))
+            .into());
+        }
+    }
+
+    let previous_bundle = previous_version.and_then(|version| {
+        version
+            .external_files
+            .iter()
+            .find(|file| file.file_type == CONFIG_BUNDLE_FILE_TYPE)
+    });
+    if previous_bundle.is_none() && selected_paths.is_empty() {
+        return Ok(None);
+    }
+
+    let mut entries = BTreeMap::new();
+    if let (Some(_), Some(previous_bundle)) =
+        (previous_version, previous_bundle)
+    {
+        let response = REQWEST_CLIENT.get(&previous_bundle.url).send().await?;
+        if !response.status().is_success() {
+            return Err(crate::ErrorKind::OtherError(format!(
+                "Previous config bundle download failed with status {}",
+                response.status()
+            ))
+            .into());
+        }
+        let bytes = response.bytes().await?;
+        let archived_entries = tokio::task::spawn_blocking(move || {
+            read_config_bundle(bytes.as_ref())
+        })
+        .await??;
+        entries.extend(archived_entries);
+    }
+
+    let config_path = state
+        .directories
+        .instances_dir()
+        .join(instance_path)
+        .join(CONFIG_DIRECTORY);
+    for selected_path in selected_paths {
+        let file = local_files_by_path
+            .get(selected_path)
+            .expect("selected config paths were validated");
+        let bytes = crate::util::io::read(config_path.join(&file.path)).await?;
+        entries.insert(file.path.clone(), bytes);
+    }
+
+    let bytes = config_bundle_bytes(&entries).await?;
+
+    Ok(Some(ExternalFileCandidate {
+        file_name: CONFIG_BUNDLE_FILE_NAME.to_string(),
+        file_type: CONFIG_BUNDLE_FILE_TYPE.to_string(),
+        source: ExternalFileSource::ConfigBundle(bytes),
+    }))
+}
+
+async fn config_bundle_bytes(
+    entries: &BTreeMap<String, Vec<u8>>,
+) -> crate::Result<Vec<u8>> {
+    if entries.len() > MAX_CONFIG_BUNDLE_ENTRIES {
+        return Err(crate::ErrorKind::InputError(
+            "Shared instance config bundle contains too many entries"
+                .to_string(),
+        )
+        .into());
+    }
+    let mut total_size = 0_u64;
+    for bytes in entries.values() {
+        let size = bytes.len() as u64;
+        if size > MAX_CONFIG_BUNDLE_FILE_SIZE {
+            return Err(crate::ErrorKind::InputError(
+                "Shared instance config bundle contains a file that is too large"
+                    .to_string(),
+            )
+            .into());
+        }
+        total_size = total_size.checked_add(size).ok_or_else(|| {
+            crate::ErrorKind::InputError(
+                "Shared instance config bundle size overflowed".to_string(),
+            )
+        })?;
+        if total_size > MAX_CONFIG_BUNDLE_TOTAL_SIZE {
+            return Err(crate::ErrorKind::InputError(
+                "Shared instance config bundle exceeds the uncompressed size limit"
+                    .to_string(),
+            )
+            .into());
+        }
+    }
+
+    let mut writer = async_zip::base::write::ZipFileWriter::new(Vec::new());
+    for (path, bytes) in entries {
+        writer
+            .write_entry_whole(
+                ZipEntryBuilder::new(path.clone().into(), Compression::Deflate),
+                bytes,
+            )
+            .await?;
+    }
+
+    Ok(writer.close().await?)
+}
+
+fn read_config_bundle(
+    bytes: &[u8],
+) -> crate::Result<BTreeMap<String, Vec<u8>>> {
+    let mut archive = zip::ZipArchive::new(std::io::Cursor::new(bytes))
+        .map_err(|error| {
+            crate::ErrorKind::InputError(format!(
+                "Invalid shared instance config bundle: {error}"
+            ))
+        })?;
+    if archive.len() > MAX_CONFIG_BUNDLE_ENTRIES {
+        return Err(crate::ErrorKind::InputError(
+            "Shared instance config bundle contains too many entries"
+                .to_string(),
+        )
+        .into());
+    }
+    let mut entries = BTreeMap::new();
+    let mut total_size = 0;
+
+    for index in 0..archive.len() {
+        let file = archive.by_index(index).map_err(|error| {
+            crate::ErrorKind::InputError(format!(
+                "Invalid shared instance config bundle entry: {error}"
+            ))
+        })?;
+        if file.is_dir() {
+            continue;
+        }
+        let path = file.enclosed_name().ok_or_else(|| {
+            crate::ErrorKind::InputError(
+                "Shared instance config bundle contains an unsafe path"
+                    .to_string(),
+            )
+        })?;
+        if !is_supported_config_file(&path) {
+            return Err(crate::ErrorKind::InputError(format!(
+                "Shared instance config bundle contains unsupported file {}",
+                path.display()
+            ))
+            .into());
+        }
+        let path = path.to_string_lossy().replace('\\', "/");
+        let declared_size = file.size();
+        let bytes = read_bounded_config_bundle_entry(
+            file,
+            declared_size,
+            &mut total_size,
+        )?;
+        if entries.insert(path.clone(), bytes).is_some() {
+            return Err(crate::ErrorKind::InputError(format!(
+                "Shared instance config bundle contains duplicate file {path}"
+            ))
+            .into());
+        }
+    }
+
+    Ok(entries)
+}
+
+pub(super) fn shared_modpack_id(link: &InstanceLink) -> Option<String> {
+    match link {
+        InstanceLink::ModrinthModpack { version_id, .. } => {
+            Some(version_id.clone())
+        }
+        InstanceLink::ServerProjectModpack {
+            content_version_id, ..
+        } => Some(content_version_id.clone()),
+        InstanceLink::SharedInstance {
+            modpack_version_id: Some(version_id),
+            ..
+        } => Some(version_id.clone()),
+        _ => None,
+    }
+}
+
+pub(super) fn ensure_shareable_link(link: &InstanceLink) -> crate::Result<()> {
+    if matches!(link, InstanceLink::ImportedModpack { .. }) {
+        return Err(crate::ErrorKind::InputError(
+            "You must unlink this modpack to share your instance".to_string(),
+        )
+        .into());
+    }
+
+    Ok(())
+}
+
+pub(super) async fn upload_external_files(
+    instance_path: &str,
+    candidates: &[ExternalFileCandidate],
+    uploads: &[ExternalFileResponse],
+    state: &State,
+) -> crate::Result<()> {
+    for upload in uploads {
+        let candidate = candidates
+            .iter()
+            .find(|candidate| {
+                candidate.file_name == upload.file_name
+                    && candidate.file_type == upload.file_type
+            })
+            .ok_or_else(|| {
+                crate::ErrorKind::InputError(format!(
+                    "Shared instance service requested unknown external file {}",
+                    upload.file_name
+                ))
+            })?;
+        let bytes = match &candidate.source {
+            ExternalFileSource::InstanceFile(file_path) => {
+                let path = state
+                    .directories
+                    .instances_dir()
+                    .join(instance_path)
+                    .join(file_path);
+                crate::util::io::read(path).await?
+            }
+            ExternalFileSource::ConfigBundle(bytes) => bytes.clone(),
+        };
+        let upload_url = url::Url::parse(&upload.url).map_err(|error| {
+            crate::ErrorKind::OtherError(format!(
+                "Invalid shared instance external file upload URL: {error}"
+            ))
+        })?;
+        let response = send_bytes_request_to_url(
+            "upload_external_file",
+            Method::PUT,
+            upload_url.path(),
+            &upload.url,
+            bytes,
+            state,
+        )
+        .await?;
+
+        if !response.status().is_success() {
+            return shared_instances_request_error(
+                "upload_external_file",
+                Method::PUT,
+                upload_url.path(),
+                response,
+            )
+            .await;
+        }
+    }
+
+    Ok(())
+}
+
+pub(super) async fn shared_attachment(
+    instance_id: &str,
+    state: &State,
+) -> crate::Result<Option<SharedInstanceAttachment>> {
+    Ok(crate::state::get_instance(instance_id, &state.pool)
+        .await?
+        .and_then(|metadata| metadata.shared_instance))
+}
+
+pub(crate) async fn sync_shared_instance_icon(
+    instance_id: &str,
+    icon_path: Option<&str>,
+    state: &State,
+) -> crate::Result<()> {
+    let Some(attachment) = shared_attachment(instance_id, state).await? else {
+        return Ok(());
+    };
+    if attachment.role != SharedInstanceRole::Owner {
+        return Ok(());
+    }
+
+    update_remote_instance_icon(&attachment.id, icon_path, state).await
+}
+
+pub(super) async fn shared_instance_for_invites(
+    instance_id: &str,
+    user_count: usize,
+    state: &State,
+) -> crate::Result<(crate::state::InstanceMetadata, SharedInstanceAttachment)> {
+    let metadata = crate::state::get_instance(instance_id, &state.pool)
+        .await?
+        .ok_or_else(|| {
+            crate::ErrorKind::InputError("Unknown instance".to_string())
+        })?;
+    let attachment = match metadata.shared_instance.clone() {
+        Some(attachment) => {
+            tracing::debug!(
+                instance_id,
+                shared_instance_id = %attachment.id,
+                role = attachment.role.as_str(),
+                user_count,
+                "Using existing shared instance attachment for invite"
+            );
+            attachment
+        }
+        None => {
+            ensure_shareable_link(&metadata.link)?;
+            tracing::info!(
+                instance_id,
+                user_count,
+                "Creating shared instance before first invite"
+            );
+            let remote = create_remote_instance(
+                shared_instance_name(metadata.instance.name.clone()),
+                state,
+            )
+            .await?;
+            let linked_user_id = linked_modrinth_user_id(state).await?;
+            tracing::info!(
+                instance_id,
+                shared_instance_id = %remote.id,
+                "Created remote shared instance"
+            );
+            crate::state::attach_shared_instance(
+                instance_id,
+                crate::state::SharedInstanceAttachmentInput {
+                    id: remote.id.clone(),
+                    role: SharedInstanceRole::Owner,
+                    manager_id: None,
+                    server_manager_name: None,
+                    server_manager_icon_url: None,
+                    linked_user_id,
+                    status: ContentSetSyncStatus::Unknown,
+                    applied_version: None,
+                    latest_version: None,
+                },
+                &state.pool,
+            )
+            .await?;
+            tracing::debug!(
+                instance_id,
+                shared_instance_id = %remote.id,
+                "Attached local instance as shared instance owner"
+            );
+            publish_shared_instance_inner(instance_id, &[], state).await?;
+            shared_attachment(instance_id, state)
+                .await?
+                .ok_or_else(|| {
+                    crate::ErrorKind::InputError(
+                        "Shared instance attachment was not persisted"
+                            .to_string(),
+                    )
+                })?
+        }
+    };
+
+    ensure_owner(&attachment)?;
+    update_remote_instance_icon(
+        &attachment.id,
+        metadata.instance.icon_path.as_deref(),
+        state,
+    )
+    .await?;
+
+    Ok((metadata, attachment))
+}
+
+pub(super) fn ensure_owner(
+    attachment: &SharedInstanceAttachment,
+) -> crate::Result<()> {
+    if attachment.role == SharedInstanceRole::Owner {
+        return Ok(());
+    }
+
+    Err(crate::ErrorKind::InputError(
+        "Only the owner instance can manage shared instance users".to_string(),
+    )
+    .into())
+}
+
+pub(super) fn ensure_member(
+    attachment: &SharedInstanceAttachment,
+) -> crate::Result<()> {
+    if attachment.role.is_member() {
+        return Ok(());
+    }
+
+    Err(crate::ErrorKind::InputError(
+        "Only shared instance members can unlink from shared instances"
+            .to_string(),
+    )
+    .into())
+}
+
+pub(super) fn file_type(project_type: ProjectType) -> String {
+    project_type.get_name().to_string()
+}
diff --git a/packages/app-lib/src/api/instance/shared/types.rs b/packages/app-lib/src/api/instance/shared/types.rs
new file mode 100644
index 000000000..05a98d788
--- /dev/null
+++ b/packages/app-lib/src/api/instance/shared/types.rs
@@ -0,0 +1,162 @@
+use super::*;
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct SharedInstanceUsers {
+    pub user_ids: Vec<String>,
+    #[serde(default)]
+    pub users: Vec<SharedInstanceUser>,
+    #[serde(default)]
+    pub tokens: i32,
+}
+
+impl SharedInstanceUsers {
+    pub(super) fn empty() -> Self {
+        Self {
+            user_ids: Vec::new(),
+            users: Vec::new(),
+            tokens: 0,
+        }
+    }
+
+    pub(super) fn from_users(
+        users: Vec<SharedInstanceUser>,
+        tokens: i32,
+    ) -> Self {
+        let user_ids = users.iter().map(|user| user.id.clone()).collect();
+
+        Self {
+            user_ids,
+            users,
+            tokens,
+        }
+    }
+
+    pub(super) fn from_user_ids(user_ids: Vec<String>) -> Self {
+        let users = user_ids
+            .iter()
+            .map(|user_id| SharedInstanceUser {
+                id: user_id.clone(),
+                joined_at: None,
+                join_type: SharedInstanceJoinType::Invite,
+                last_played: None,
+            })
+            .collect();
+
+        Self {
+            user_ids,
+            users,
+            tokens: 0,
+        }
+    }
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct SharedInstanceUser {
+    pub id: String,
+    pub joined_at: Option<DateTime<Utc>>,
+    pub join_type: SharedInstanceJoinType,
+    pub last_played: Option<DateTime<Utc>>,
+}
+
+#[derive(Clone, Copy, Debug, Eq, PartialEq, Serialize, Deserialize)]
+#[serde(rename_all = "lowercase")]
+pub enum SharedInstanceJoinType {
+    Owner,
+    Invite,
+    Link,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct SharedInstanceInstallPreview {
+    pub shared_instance_id: String,
+    pub version: i32,
+    pub name: String,
+    pub icon_url: Option<String>,
+    pub game_version: String,
+    pub loader: ModLoader,
+    pub mod_count: usize,
+    pub external_file_count: usize,
+    pub modpack_version_id: Option<String>,
+    pub content_version_ids: Vec<String>,
+    pub external_files: Vec<SharedInstanceExternalFilePreview>,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct SharedInstanceExternalFilePreview {
+    pub file_name: String,
+    pub file_type: String,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct SharedInstanceUpdatePreview {
+    pub shared_instance_id: String,
+    pub current_version: Option<i32>,
+    pub latest_version: i32,
+    pub update_available: bool,
+    pub diffs: Vec<SharedInstanceUpdateDiff>,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct SharedInstancePublishPreview {
+    pub shared_instance_id: String,
+    pub latest_version: i32,
+    pub diffs: Vec<SharedInstanceUpdateDiff>,
+    pub config_files: Vec<String>,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct SharedInstanceInviteLink {
+    pub invite_id: String,
+    pub expires_at: DateTime<Utc>,
+    pub max_uses: i32,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct SharedInstanceInviteInstallPreview {
+    pub shared_instance_id: String,
+    pub manager_id: Option<String>,
+    pub server_manager_name: Option<String>,
+    pub server_manager_icon_url: Option<String>,
+    pub instance_icon_url: Option<String>,
+    pub preview: SharedInstanceInstallPreview,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct SharedInstanceUpdateDiff {
+    #[serde(rename = "type")]
+    pub type_: SharedInstanceUpdateDiffType,
+    pub project_id: Option<String>,
+    pub project_name: Option<String>,
+    pub file_name: Option<String>,
+    pub current_version_name: Option<String>,
+    pub new_version_name: Option<String>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub config_file_count: Option<usize>,
+    #[serde(default, skip_serializing_if = "is_false")]
+    pub disabled: bool,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub enum SharedInstanceUpdateDiffType {
+    Added,
+    Removed,
+    Updated,
+    ModpackLinked,
+    ModpackUpdated,
+    ModpackUnlinked,
+    GameVersionUpdated,
+    LoaderUpdated,
+    ConfigFilesUpdated,
+}
+
+pub(super) fn is_false(value: &bool) -> bool {
+    !*value
+}
diff --git a/packages/app-lib/src/api/mod.rs b/packages/app-lib/src/api/mod.rs
index 927a666aa..96d5928ed 100644
--- a/packages/app-lib/src/api/mod.rs
+++ b/packages/app-lib/src/api/mod.rs
@@ -11,9 +11,11 @@ pub mod minecraft_skins;
 pub mod mr_auth;
 pub mod pack;
 pub mod process;
+pub mod reports;
 pub mod server_address;
 pub mod settings;
 pub mod tags;
+pub mod users;
 pub mod worlds;
 
 pub mod data {
@@ -26,7 +28,8 @@ pub mod data {
         JavaVersion, LinkedModpackInfo, MemorySettings, ModLoader,
         ModrinthCredentials, Organization, OwnerType, ProcessMetadata, Project,
         ProjectType, ProjectV3, SearchResult, SearchResults, SearchResultsV3,
-        Settings, TeamMember, Theme, User, UserFriend, Version, WindowSize,
+        Settings, SharedInstanceAttachment, SharedInstanceRole, TeamMember,
+        Theme, User, UserFriend, Version, WindowSize,
     };
     pub use ariadne::users::UserStatus;
     pub use modrinth_content_management::{
diff --git a/packages/app-lib/src/api/mr_auth.rs b/packages/app-lib/src/api/mr_auth.rs
index 42ce41fe5..428a63a65 100644
--- a/packages/app-lib/src/api/mr_auth.rs
+++ b/packages/app-lib/src/api/mr_auth.rs
@@ -1,8 +1,19 @@
 use crate::state::ModrinthCredentials;
+use serde::Deserialize;
+
+#[derive(Clone, Copy, Debug, Deserialize)]
+#[serde(rename_all = "kebab-case")]
+pub enum ModrinthAuthFlow {
+    SignIn,
+    SignUp,
+}
 
 #[tracing::instrument]
-pub fn authenticate_begin_flow() -> &'static str {
-    crate::state::get_login_url()
+pub fn authenticate_begin_flow(flow: ModrinthAuthFlow) -> &'static str {
+    match flow {
+        ModrinthAuthFlow::SignIn => crate::state::get_login_url(),
+        ModrinthAuthFlow::SignUp => crate::state::get_signup_url(),
+    }
 }
 
 #[tracing::instrument]
diff --git a/packages/app-lib/src/api/reports.rs b/packages/app-lib/src/api/reports.rs
new file mode 100644
index 000000000..75e13cb28
--- /dev/null
+++ b/packages/app-lib/src/api/reports.rs
@@ -0,0 +1,46 @@
+use crate::State;
+use crate::util::fetch::fetch_json;
+use reqwest::Method;
+use serde::{Deserialize, Serialize};
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+#[serde(rename_all = "kebab-case")]
+pub enum ReportItemType {
+    Project,
+    Version,
+    User,
+    SharedInstance,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct CreateReportRequest {
+    pub report_type: String,
+    pub item_id: String,
+    pub item_type: ReportItemType,
+    pub body: String,
+    #[serde(default, skip_serializing_if = "Vec::is_empty")]
+    pub uploaded_images: Vec<String>,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct CreateReportResponse {
+    pub id: String,
+}
+
+#[tracing::instrument(skip(request))]
+pub async fn create_report(
+    request: CreateReportRequest,
+) -> crate::Result<CreateReportResponse> {
+    let state = State::get().await?;
+
+    fetch_json(
+        Method::POST,
+        &format!("{}report", env!("MODRINTH_API_URL_V3")),
+        None,
+        Some(serde_json::to_value(request)?),
+        Some("/v3/report"),
+        &state.api_semaphore,
+        &state.pool,
+    )
+    .await
+}
diff --git a/packages/app-lib/src/api/users.rs b/packages/app-lib/src/api/users.rs
new file mode 100644
index 000000000..6d5f4019f
--- /dev/null
+++ b/packages/app-lib/src/api/users.rs
@@ -0,0 +1,32 @@
+use crate::State;
+use crate::util::fetch::fetch_json;
+use reqwest::Method;
+use serde::{Deserialize, Serialize};
+
+#[derive(Serialize, Deserialize, Clone, Debug)]
+pub struct SearchUser {
+    pub id: String,
+    pub username: String,
+    pub avatar_url: Option<String>,
+}
+
+#[tracing::instrument]
+pub async fn search_user(query: &str) -> crate::Result<Vec<SearchUser>> {
+    let state = State::get().await?;
+    let query = urlencoding::encode(query);
+
+    fetch_json(
+        Method::GET,
+        &format!(
+            "{}users/search?query={}",
+            env!("MODRINTH_API_URL_V3"),
+            query
+        ),
+        None,
+        None,
+        Some("/v3/users/search"),
+        &state.api_semaphore,
+        &state.pool,
+    )
+    .await
+}
diff --git a/packages/app-lib/src/error.rs b/packages/app-lib/src/error.rs
index 4ab04cea1..ad7dca9e5 100644
--- a/packages/app-lib/src/error.rs
+++ b/packages/app-lib/src/error.rs
@@ -22,6 +22,24 @@ pub struct LabrinthError {
     pub route: Option<String>,
 }
 
+#[derive(Clone, Copy, Debug, Deserialize, Eq, PartialEq, Serialize)]
+#[serde(rename_all = "snake_case")]
+pub enum SharedInstanceUnavailableReason {
+    Deleted,
+    AccessRevoked,
+    Quarantined,
+}
+
+impl std::fmt::Display for SharedInstanceUnavailableReason {
+    fn fmt(&self, fmt: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Self::Deleted => write!(fmt, "deleted"),
+            Self::AccessRevoked => write!(fmt, "access_revoked"),
+            Self::Quarantined => write!(fmt, "quarantined"),
+        }
+    }
+}
+
 #[derive(thiserror::Error, Debug)]
 pub enum ErrorKind {
     #[error("{0:?}")]
@@ -103,6 +121,9 @@ pub enum ErrorKind {
     #[error("Invalid input: {0}")]
     InputError(String),
 
+    #[error("Shared instance unavailable: {0}")]
+    SharedInstanceUnavailable(SharedInstanceUnavailableReason),
+
     #[error("Join handle error: {0}")]
     JoinError(#[from] tokio::task::JoinError),
 
diff --git a/packages/app-lib/src/event/mod.rs b/packages/app-lib/src/event/mod.rs
index e61dded89..3a1dabb95 100644
--- a/packages/app-lib/src/event/mod.rs
+++ b/packages/app-lib/src/event/mod.rs
@@ -234,6 +234,9 @@ pub enum CommandPayload {
         server: Option<String>,
         singleplayer_world: Option<String>,
     },
+    InstallSharedInstanceInvite {
+        invite_id: String,
+    },
     RunMRPack {
         // run or install .mrpack
         path: PathBuf,
diff --git a/packages/app-lib/src/install/mod.rs b/packages/app-lib/src/install/mod.rs
index bc8ba02f8..ec6844bda 100644
--- a/packages/app-lib/src/install/mod.rs
+++ b/packages/app-lib/src/install/mod.rs
@@ -3,6 +3,7 @@ pub mod events;
 pub mod model;
 pub mod recovery;
 pub mod runner;
+mod shared_instance;
 pub mod store;
 
 pub use events::InstallProgressReporter;
@@ -11,11 +12,13 @@ pub use model::{
     InstallJobEventKind, InstallJobKind, InstallJobSnapshot, InstallJobStatus,
     InstallModpackPreview, InstallPhaseDetails, InstallPhaseId,
     InstallPostInstallEdit, InstallProgress, InstallProgressSecondary,
-    InstallRequest,
+    InstallRequest, SharedInstanceExternalFileData, SharedInstanceInstallData,
+    SharedInstanceInstallModpack,
 };
 pub use runner::{
-    cancel_job, create_instance, create_modpack_instance, dismiss_job,
-    duplicate_instance, get_job, import_instance, install_existing_instance,
+    cancel_job, create_instance, create_modpack_instance,
+    create_shared_instance, dismiss_job, duplicate_instance, get_job,
+    import_instance, install_existing_instance,
     install_pack_to_existing_instance, job_support_details, list_jobs,
-    retry_job,
+    retry_job, update_shared_instance,
 };
diff --git a/packages/app-lib/src/install/model.rs b/packages/app-lib/src/install/model.rs
index 434654214..4f49c1db9 100644
--- a/packages/app-lib/src/install/model.rs
+++ b/packages/app-lib/src/install/model.rs
@@ -169,6 +169,9 @@ pub enum InstallRequest {
         #[serde(default)]
         post_install_edit: Option<InstallPostInstallEdit>,
     },
+    CreateSharedInstance {
+        data: SharedInstanceInstallData,
+    },
     ImportInstance {
         launcher_type: ImportLauncherType,
         base_path: PathBuf,
@@ -187,6 +190,10 @@ pub enum InstallRequest {
         #[serde(default)]
         post_install_edit: Option<InstallPostInstallEdit>,
     },
+    UpdateSharedInstance {
+        instance_id: String,
+        data: SharedInstanceInstallData,
+    },
 }
 
 #[derive(Serialize, Deserialize, Clone, Debug, Default)]
@@ -201,6 +208,46 @@ pub struct InstallPostInstallEdit {
     pub link: Option<InstanceLink>,
 }
 
+#[derive(Serialize, Deserialize, Clone, Debug)]
+pub struct SharedInstanceInstallData {
+    pub shared_instance_id: String,
+    pub manager_id: Option<String>,
+    #[serde(default)]
+    pub server_manager_name: Option<String>,
+    #[serde(default)]
+    pub server_manager_icon_url: Option<String>,
+    #[serde(default)]
+    pub instance_icon_url: Option<String>,
+    #[serde(default)]
+    pub linked_user_id: Option<String>,
+    pub name: String,
+    pub version: i32,
+    pub modrinth_ids: Vec<String>,
+    #[serde(default)]
+    pub external_files: Vec<SharedInstanceExternalFileData>,
+    pub modpack: Option<SharedInstanceInstallModpack>,
+    pub game_version: String,
+    pub loader: ModLoader,
+    pub loader_version: Option<String>,
+}
+
+#[derive(Serialize, Deserialize, Clone, Debug)]
+pub struct SharedInstanceExternalFileData {
+    pub file_name: String,
+    pub file_type: String,
+    pub url: String,
+    pub file_size: u64,
+}
+
+#[derive(Serialize, Deserialize, Clone, Debug)]
+pub struct SharedInstanceInstallModpack {
+    pub project_id: String,
+    pub version_id: String,
+    pub title: String,
+    pub icon_url: Option<String>,
+    pub dependency_count: usize,
+}
+
 impl InstallRequest {
     pub fn kind(&self) -> InstallJobKind {
         match self {
@@ -208,6 +255,9 @@ impl InstallRequest {
             Self::CreateModpackInstance { .. } => {
                 InstallJobKind::CreateModpackInstance
             }
+            Self::CreateSharedInstance { .. } => {
+                InstallJobKind::CreateSharedInstance
+            }
             Self::ImportInstance { .. } => InstallJobKind::ImportInstance,
             Self::DuplicateInstance { .. } => InstallJobKind::DuplicateInstance,
             Self::InstallExistingInstance { .. } => {
@@ -216,13 +266,17 @@ impl InstallRequest {
             Self::InstallPackToExistingInstance { .. } => {
                 InstallJobKind::InstallPackToExistingInstance
             }
+            Self::UpdateSharedInstance { .. } => {
+                InstallJobKind::UpdateSharedInstance
+            }
         }
     }
 
     pub fn target(&self) -> InstallTarget {
         match self {
             Self::InstallExistingInstance { instance_id, .. }
-            | Self::InstallPackToExistingInstance { instance_id, .. } => {
+            | Self::InstallPackToExistingInstance { instance_id, .. }
+            | Self::UpdateSharedInstance { instance_id, .. } => {
                 InstallTarget::ExistingInstance {
                     instance_id: instance_id.clone(),
                 }
@@ -234,7 +288,8 @@ impl InstallRequest {
     pub fn cleanup(&self) -> InstallCleanup {
         match self {
             Self::InstallExistingInstance { instance_id, .. }
-            | Self::InstallPackToExistingInstance { instance_id, .. } => {
+            | Self::InstallPackToExistingInstance { instance_id, .. }
+            | Self::UpdateSharedInstance { instance_id, .. } => {
                 InstallCleanup::RestoreExistingInstance {
                     instance_id: instance_id.clone(),
                 }
@@ -249,10 +304,12 @@ impl InstallRequest {
 pub enum InstallJobKind {
     CreateInstance,
     CreateModpackInstance,
+    CreateSharedInstance,
     ImportInstance,
     DuplicateInstance,
     InstallExistingInstance,
     InstallPackToExistingInstance,
+    UpdateSharedInstance,
 }
 
 impl InstallJobKind {
@@ -260,24 +317,28 @@ impl InstallJobKind {
         match self {
             Self::CreateInstance => "create_instance",
             Self::CreateModpackInstance => "create_modpack_instance",
+            Self::CreateSharedInstance => "create_shared_instance",
             Self::ImportInstance => "import_instance",
             Self::DuplicateInstance => "duplicate_instance",
             Self::InstallExistingInstance => "install_existing_instance",
             Self::InstallPackToExistingInstance => {
                 "install_pack_to_existing_instance"
             }
+            Self::UpdateSharedInstance => "update_shared_instance",
         }
     }
 
     pub fn from_stored_str(value: &str) -> Self {
         match value {
             "create_modpack_instance" => Self::CreateModpackInstance,
+            "create_shared_instance" => Self::CreateSharedInstance,
             "import_instance" => Self::ImportInstance,
             "duplicate_instance" => Self::DuplicateInstance,
             "install_existing_instance" => Self::InstallExistingInstance,
             "install_pack_to_existing_instance" => {
                 Self::InstallPackToExistingInstance
             }
+            "update_shared_instance" => Self::UpdateSharedInstance,
             _ => Self::CreateInstance,
         }
     }
@@ -484,6 +545,8 @@ pub struct InstallErrorView {
     pub phase: Option<InstallPhaseId>,
     pub message: String,
     #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub reason: Option<crate::SharedInstanceUnavailableReason>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
     pub api: Option<InstallApiErrorDetails>,
     #[serde(default, skip_serializing_if = "Option::is_none")]
     pub context: Option<InstallErrorContext>,
@@ -513,6 +576,7 @@ impl InstallErrorView {
             code: code.to_string(),
             phase: Some(phase),
             message: error.to_string(),
+            reason: None,
             api: match error.raw.as_ref() {
                 crate::ErrorKind::LabrinthError(error) => {
                     Some(InstallApiErrorDetails {
@@ -538,6 +602,7 @@ impl InstallErrorView {
             code: code.to_string(),
             phase: Some(phase),
             message: message.into(),
+            reason: None,
             api: None,
             context: None,
         }
diff --git a/packages/app-lib/src/install/recovery.rs b/packages/app-lib/src/install/recovery.rs
index e74feb323..db56f2e2b 100644
--- a/packages/app-lib/src/install/recovery.rs
+++ b/packages/app-lib/src/install/recovery.rs
@@ -7,7 +7,257 @@ use super::model::{
 use super::store;
 use crate::event::InstancePayloadType;
 use crate::event::emit::emit_instance;
-use crate::state::State;
+use crate::state::instances::adapters::sqlite::{content_rows, instance_rows};
+use crate::state::{
+    ContentEntry, ContentSetRemoteRef, ContentSetRemoteRefType,
+    ContentSetSyncProvider, ContentSetSyncState, InstanceFile,
+    InstanceMetadata, State,
+};
+use async_walkdir::WalkDir;
+use chrono::Utc;
+use futures::StreamExt;
+use serde::{Deserialize, Serialize};
+use std::path::{Path, PathBuf};
+use uuid::Uuid;
+
+const SHARED_INSTANCE_ROLLBACK_FILE: &str = "rollback.json";
+const SHARED_INSTANCE_ROLLBACK_INSTANCE_DIR: &str = "instance";
+
+#[derive(Deserialize, Serialize)]
+struct SharedInstanceUpdateRollback {
+    files: Vec<InstanceFile>,
+    entries: Vec<ContentEntry>,
+}
+
+pub(super) async fn prepare_shared_instance_update_backup(
+    job_id: Uuid,
+    metadata: &InstanceMetadata,
+    state: &State,
+) -> crate::Result<PathBuf> {
+    let staging_dir = state
+        .directories
+        .metadata_dir()
+        .join("install_job_backups")
+        .join(job_id.to_string());
+    if tokio::fs::try_exists(&staging_dir).await? {
+        crate::util::io::remove_dir_all(&staging_dir).await?;
+    }
+    crate::util::io::create_dir_all(&staging_dir).await?;
+
+    let result = async {
+        let files = content_rows::get_instance_files(
+            &metadata.instance.id,
+            &state.pool,
+        )
+        .await?;
+        let entries = content_rows::get_content_entries(
+            &metadata.applied_content_set.id,
+            &state.pool,
+        )
+        .await?;
+        let snapshot = SharedInstanceUpdateRollback { files, entries };
+        let instance_path = state
+            .directories
+            .instances_dir()
+            .join(&metadata.instance.path);
+        copy_directory(
+            &instance_path,
+            &staging_dir.join(SHARED_INSTANCE_ROLLBACK_INSTANCE_DIR),
+            state,
+        )
+        .await?;
+        crate::util::io::write(
+            staging_dir.join(SHARED_INSTANCE_ROLLBACK_FILE),
+            serde_json::to_vec(&snapshot)?,
+        )
+        .await?;
+
+        Ok::<(), crate::Error>(())
+    }
+    .await;
+
+    if result.is_err() {
+        let _ = crate::util::io::remove_dir_all(&staging_dir).await;
+    }
+    result?;
+    Ok(staging_dir)
+}
+
+pub(super) async fn clear_staging_dir(job_state: &InstallJobState) {
+    let Some(staging_dir) = &job_state.paths.staging_dir else {
+        return;
+    };
+    if let Err(error) = crate::util::io::remove_dir_all(staging_dir).await
+        && error.kind() != std::io::ErrorKind::NotFound
+    {
+        tracing::warn!(
+            path = %staging_dir.display(),
+            "Failed to remove install rollback backup: {error}"
+        );
+    }
+}
+
+async fn restore_shared_instance_update(
+    staging_dir: &Path,
+    rollback: &super::model::InstallRollbackState,
+    state: &State,
+) -> crate::Result<()> {
+    let snapshot = serde_json::from_slice::<SharedInstanceUpdateRollback>(
+        &crate::util::io::read(staging_dir.join(SHARED_INSTANCE_ROLLBACK_FILE))
+            .await?,
+    )?;
+    let instance_path = state
+        .directories
+        .instances_dir()
+        .join(&rollback.instance.instance.path);
+    if tokio::fs::try_exists(&instance_path).await? {
+        crate::util::io::remove_dir_all(&instance_path).await?;
+    }
+    copy_directory(
+        &staging_dir.join(SHARED_INSTANCE_ROLLBACK_INSTANCE_DIR),
+        &instance_path,
+        state,
+    )
+    .await?;
+    content_rows::restore_instance_content_snapshot(
+        &rollback.instance.instance.id,
+        &snapshot.files,
+        &snapshot.entries,
+        &state.pool,
+    )
+    .await?;
+    restore_instance_metadata(&rollback.instance, state).await?;
+
+    Ok(())
+}
+
+async fn restore_instance_metadata(
+    metadata: &InstanceMetadata,
+    state: &State,
+) -> crate::Result<()> {
+    let content_set_id = metadata.applied_content_set.id.as_str();
+    let mut tx = state.pool.begin().await?;
+    instance_rows::update_instance(&metadata.instance, &mut tx).await?;
+    content_rows::update_content_set(&metadata.applied_content_set, &mut tx)
+        .await?;
+    instance_rows::upsert_instance_link(
+        &metadata.instance.id,
+        &metadata.link,
+        &mut tx,
+    )
+    .await?;
+    instance_rows::set_shared_instance_attachment(
+        &metadata.instance.id,
+        metadata.shared_instance.as_ref(),
+        &mut tx,
+    )
+    .await?;
+    instance_rows::replace_instance_groups(
+        &metadata.instance.id,
+        &metadata.groups,
+        &mut tx,
+    )
+    .await?;
+    instance_rows::upsert_instance_launch_overrides(
+        &metadata.launch_overrides,
+        &mut tx,
+    )
+    .await?;
+    content_rows::delete_content_set_remote_ref(
+        content_set_id,
+        ContentSetRemoteRefType::SharedContentSet,
+        &mut tx,
+    )
+    .await?;
+    content_rows::delete_content_set_sync_state(content_set_id, &mut tx)
+        .await?;
+    if let Some(attachment) = &metadata.shared_instance {
+        content_rows::upsert_content_set_remote_ref(
+            &ContentSetRemoteRef {
+                content_set_id: content_set_id.to_string(),
+                ref_type: ContentSetRemoteRefType::SharedContentSet,
+                ref_id: attachment.id.clone(),
+            },
+            &mut tx,
+        )
+        .await?;
+        content_rows::upsert_content_set_sync_state(
+            &ContentSetSyncState {
+                content_set_id: content_set_id.to_string(),
+                provider: ContentSetSyncProvider::SharedInstance,
+                applied_update_id: attachment
+                    .applied_version
+                    .map(|value| value.to_string()),
+                latest_available_update_id: attachment
+                    .latest_version
+                    .map(|value| value.to_string()),
+                checked_at: Some(Utc::now()),
+                status: attachment.status,
+            },
+            &mut tx,
+        )
+        .await?;
+    }
+    tx.commit().await?;
+
+    Ok(())
+}
+
+async fn copy_directory(
+    source: &Path,
+    target: &Path,
+    state: &State,
+) -> crate::Result<()> {
+    crate::util::io::create_dir_all(target).await?;
+    let mut walker = WalkDir::new(source);
+    while let Some(entry) = walker.next().await {
+        let entry = entry.map_err(|error| {
+            crate::ErrorKind::FSError(format!(
+                "Failed to read instance backup path: {error}"
+            ))
+        })?;
+        let entry_path = entry.path();
+        let relative_path = entry_path.strip_prefix(source)?;
+        let target_path = target.join(relative_path);
+        let file_type = entry.file_type().await?;
+        if file_type.is_dir() {
+            crate::util::io::create_dir_all(&target_path).await?;
+        } else if file_type.is_file() {
+            crate::util::fetch::copy(
+                &entry_path,
+                &target_path,
+                &state.io_semaphore,
+            )
+            .await?;
+        } else if file_type.is_symlink() {
+            copy_symlink(&entry_path, &target_path).await?;
+        }
+    }
+
+    Ok(())
+}
+
+async fn copy_symlink(source: &Path, target: &Path) -> crate::Result<()> {
+    if let Some(parent) = target.parent() {
+        crate::util::io::create_dir_all(parent).await?;
+    }
+    let link_target = tokio::fs::read_link(source).await?;
+
+    #[cfg(unix)]
+    tokio::fs::symlink(link_target, target).await?;
+
+    #[cfg(windows)]
+    {
+        let metadata = tokio::fs::metadata(source).await?;
+        if metadata.is_dir() {
+            tokio::fs::symlink_dir(link_target, target).await?;
+        } else {
+            tokio::fs::symlink_file(link_target, target).await?;
+        }
+    }
+
+    Ok(())
+}
 
 pub async fn recover_interrupted_jobs(state: &State) -> crate::Result<()> {
     let jobs = store::list_interrupted_candidates(state).await?;
@@ -61,6 +311,9 @@ pub async fn recover_interrupted_jobs(state: &State) -> crate::Result<()> {
             state,
         )
         .await?;
+        if job.state.rollback_error.is_none() {
+            clear_staging_dir(&job.state).await;
+        }
         emit_install_job(&record.snapshot()).await?;
     }
 
@@ -96,6 +349,15 @@ fn display_from_request(state: &InstallJobState) -> Option<InstallJobDisplay> {
                 ..
             } => None,
         },
+        InstallRequest::CreateSharedInstance { data } => {
+            Some(InstallJobDisplay {
+                title: data.name.clone(),
+                icon: data
+                    .modpack
+                    .as_ref()
+                    .and_then(|modpack| modpack.icon_url.clone()),
+            })
+        }
         InstallRequest::ImportInstance {
             instance_folder, ..
         } => Some(InstallJobDisplay {
@@ -104,7 +366,8 @@ fn display_from_request(state: &InstallJobState) -> Option<InstallJobDisplay> {
         }),
         InstallRequest::DuplicateInstance { .. }
         | InstallRequest::InstallExistingInstance { .. }
-        | InstallRequest::InstallPackToExistingInstance { .. } => {
+        | InstallRequest::InstallPackToExistingInstance { .. }
+        | InstallRequest::UpdateSharedInstance { .. } => {
             state.rollback.as_ref().map(|rollback| InstallJobDisplay {
                 title: rollback.instance.instance.name.clone(),
                 icon: rollback.instance.instance.icon_path.clone(),
@@ -128,12 +391,25 @@ pub async fn apply_cleanup(
         }
         InstallCleanup::RestoreExistingInstance { instance_id } => {
             if let Some(rollback) = &job_state.rollback {
-                crate::state::instances::commands::set_instance_install_stage(
-                    instance_id,
-                    rollback.install_stage,
-                    &state.pool,
-                )
-                .await?;
+                if matches!(
+                    &job_state.request,
+                    InstallRequest::UpdateSharedInstance { .. }
+                ) && let Some(staging_dir) = &job_state.paths.staging_dir
+                {
+                    restore_shared_instance_update(
+                        staging_dir,
+                        rollback,
+                        state,
+                    )
+                    .await?;
+                } else {
+                    crate::state::instances::commands::set_instance_install_stage(
+                        instance_id,
+                        rollback.install_stage,
+                        &state.pool,
+                    )
+                    .await?;
+                }
                 emit_instance(instance_id, InstancePayloadType::Edited).await?;
             }
         }
diff --git a/packages/app-lib/src/install/runner.rs b/packages/app-lib/src/install/runner.rs
index 36515a053..ac08df288 100644
--- a/packages/app-lib/src/install/runner.rs
+++ b/packages/app-lib/src/install/runner.rs
@@ -3,7 +3,13 @@ use super::model::{
     InstallCleanup, InstallErrorContext, InstallErrorView, InstallJobDisplay,
     InstallJobEventKind, InstallJobSnapshot, InstallJobState, InstallJobStatus,
     InstallPhaseDetails, InstallPhaseId, InstallPostInstallEdit,
-    InstallRequest, InstallRollbackState, InstallTarget,
+    InstallProgress, InstallRequest, InstallRollbackState, InstallTarget,
+    SharedInstanceInstallData,
+};
+use super::shared_instance::{
+    apply_shared_instance_content, apply_shared_instance_update,
+    attach_pending_shared_instance, finalize_shared_instance_attachment,
+    shared_instance_link, shared_instance_pack_location,
 };
 use super::{diagnostics, recovery, store};
 use crate::ErrorKind;
@@ -53,6 +59,19 @@ pub async fn create_modpack_instance(
     .await
 }
 
+pub async fn create_shared_instance(
+    data: SharedInstanceInstallData,
+) -> crate::Result<InstallJobSnapshot> {
+    start(InstallRequest::CreateSharedInstance { data }).await
+}
+
+pub async fn update_shared_instance(
+    instance_id: String,
+    data: SharedInstanceInstallData,
+) -> crate::Result<InstallJobSnapshot> {
+    start(InstallRequest::UpdateSharedInstance { instance_id, data }).await
+}
+
 pub async fn import_instance(
     launcher_type: crate::api::pack::import::ImportLauncherType,
     base_path: PathBuf,
@@ -129,9 +148,15 @@ pub async fn retry_job(job_id: Uuid) -> crate::Result<InstallJobSnapshot> {
         .into());
     }
 
+    if job.state.rollback_error.is_some() {
+        recovery::apply_cleanup(&job.state, &state).await?;
+        recovery::clear_staging_dir(&job.state).await;
+    }
+
     job.state.target = job.state.request.target();
     job.state.cleanup = job.state.request.cleanup();
     job.state.rollback = None;
+    job.state.paths.staging_dir = None;
     job.state.error = None;
     job.state.rollback_error = None;
     job.state.context = None;
@@ -150,6 +175,7 @@ pub async fn retry_job(job_id: Uuid) -> crate::Result<InstallJobSnapshot> {
         &state,
     )
     .await?;
+    lock_existing_instance_if_needed(&job.state, &state).await?;
     emit_install_job(&record.snapshot()).await?;
     spawn_job(job_id);
 
@@ -204,6 +230,9 @@ pub async fn cancel_job(job_id: Uuid) -> crate::Result<InstallJobSnapshot> {
         &state,
     )
     .await?;
+    if job.state.rollback_error.is_none() {
+        recovery::clear_staging_dir(&job.state).await;
+    }
     emit_install_job(&record.snapshot()).await?;
 
     Ok(record.snapshot())
@@ -221,6 +250,7 @@ async fn start(request: InstallRequest) -> crate::Result<InstallJobSnapshot> {
     prepare_initial_instance(&mut job_state, &state).await?;
     let record =
         store::insert(id, &job_state, InstallJobStatus::Queued, &state).await?;
+    lock_existing_instance_if_needed(&job_state, &state).await?;
     emit_install_job(&record.snapshot()).await?;
     spawn_job(id);
     Ok(record.snapshot())
@@ -296,6 +326,54 @@ async fn prepare_initial_instance(
             );
             set_instance_id(job_state, metadata.instance.id);
         }
+        InstallRequest::CreateSharedInstance { data } => {
+            let shared_link = shared_instance_link(data.modpack.as_ref());
+            let (game_version, loader, loader_version, icon_path) =
+                if let Some(modpack) = data.modpack.clone() {
+                    let preview = get_instance_from_pack(
+                        shared_instance_pack_location(modpack),
+                    )
+                    .await?;
+                    (
+                        preview.game_version,
+                        preview.modloader,
+                        preview.loader_version,
+                        data.instance_icon_url
+                            .clone()
+                            .or_else(|| {
+                                preview.icon.as_ref().map(|path| {
+                                    path.to_string_lossy().to_string()
+                                })
+                            })
+                            .or_else(|| preview.icon_url.clone()),
+                    )
+                } else {
+                    (
+                        data.game_version.clone(),
+                        data.loader,
+                        data.loader_version.clone(),
+                        data.instance_icon_url.clone(),
+                    )
+                };
+            let metadata = crate::api::instance::create(
+                data.name.clone(),
+                game_version,
+                loader,
+                loader_version,
+                icon_path,
+                shared_link,
+            )
+            .await?;
+            set_display(
+                job_state,
+                metadata.instance.name,
+                metadata.instance.icon_path,
+            );
+            let instance_id = metadata.instance.id;
+            attach_pending_shared_instance(&instance_id, &data, state).await?;
+            emit_instance(&instance_id, InstancePayloadType::Edited).await?;
+            set_instance_id(job_state, instance_id);
+        }
         InstallRequest::ImportInstance {
             instance_folder, ..
         } => {
@@ -343,7 +421,8 @@ async fn prepare_initial_instance(
         InstallRequest::InstallExistingInstance { instance_id, .. }
         | InstallRequest::InstallPackToExistingInstance {
             instance_id, ..
-        } => {
+        }
+        | InstallRequest::UpdateSharedInstance { instance_id, .. } => {
             prepare_existing_rollback(job_state, state, &instance_id).await?;
         }
     }
@@ -353,7 +432,7 @@ async fn prepare_initial_instance(
 
 fn spawn_job(job_id: Uuid) {
     tokio::spawn(async move {
-        if let Err(error) = run_job(job_id).await {
+        if let Err(error) = Box::pin(run_job(job_id)).await {
             tracing::error!(
                 "Install job {job_id} failed to update state: {error}"
             );
@@ -387,16 +466,23 @@ async fn run_job(job_id: Uuid) -> crate::Result<()> {
     .await?;
     emit_install_job(&record.snapshot()).await?;
 
-    let result = run_request(job_id, &mut job_state, &state).await;
+    let result = Box::pin(run_request(job_id, &mut job_state, &state)).await;
     if let Ok(record) = store::get_required(job_id, &state).await {
         job_state = record.state;
     }
 
-    match result {
+    let result = match result {
         Ok(instance_id) => {
             if let Some(instance_id) = instance_id {
                 set_instance_id(&mut job_state, instance_id);
             }
+            finalize_existing_instance_success(&job_state, &state).await
+        }
+        Err(error) => Err(error),
+    };
+
+    match result {
+        Ok(()) => {
             job_state.record_event(InstallJobEventKind::JobSucceeded {
                 instance_id: current_instance_id(&job_state),
             });
@@ -413,6 +499,7 @@ async fn run_job(job_id: Uuid) -> crate::Result<()> {
                 &state,
             )
             .await?;
+            recovery::clear_staging_dir(&job_state).await;
             emit_install_job(&record.snapshot()).await?;
         }
         Err(error) => {
@@ -459,6 +546,9 @@ async fn run_job(job_id: Uuid) -> crate::Result<()> {
                 &state,
             )
             .await?;
+            if job_state.rollback_error.is_none() {
+                recovery::clear_staging_dir(&job_state).await;
+            }
             emit_install_job(&record.snapshot()).await?;
             return Err(error);
         }
@@ -541,17 +631,39 @@ async fn run_request(
                 modpack_details(&location),
             )
             .await?;
-            install_pack(
+            Box::pin(install_pack(
                 job_id,
                 job_state,
                 location,
                 instance_id.clone(),
                 DownloadReason::Modpack,
-            )
+            ))
             .await?;
             apply_post_install_edit(&instance_id, post_install_edit).await?;
             Ok(Some(instance_id))
         }
+        InstallRequest::CreateSharedInstance { data } => {
+            let Some(instance_id) = current_instance_id(job_state) else {
+                return Err(crate::ErrorKind::InputError(
+                    "Install job is missing its instance id".to_string(),
+                )
+                .into());
+            };
+            Box::pin(apply_shared_instance_content(
+                job_id,
+                job_state,
+                state,
+                &instance_id,
+                &data,
+            ))
+            .await?;
+
+            finalize_shared_instance_attachment(&instance_id, &data, state)
+                .await?;
+            emit_instance(&instance_id, InstancePayloadType::Edited).await?;
+
+            Ok(Some(instance_id))
+        }
         InstallRequest::ImportInstance {
             launcher_type,
             base_path,
@@ -629,6 +741,7 @@ async fn run_request(
         }
         InstallRequest::InstallExistingInstance { instance_id, force } => {
             prepare_existing_rollback(job_state, state, &instance_id).await?;
+            lock_existing_instance(&instance_id, state).await?;
             update_progress(
                 job_id,
                 job_state,
@@ -660,6 +773,7 @@ async fn run_request(
             post_install_edit,
         } => {
             prepare_existing_rollback(job_state, state, &instance_id).await?;
+            lock_existing_instance(&instance_id, state).await?;
             let disabled_project_ids = remove_existing_pack_content(
                 job_id,
                 job_state,
@@ -667,13 +781,13 @@ async fn run_request(
                 &instance_id,
             )
             .await?;
-            install_pack(
+            Box::pin(install_pack(
                 job_id,
                 job_state,
                 location,
                 instance_id.clone(),
                 DownloadReason::Modpack,
-            )
+            ))
             .await?;
             restore_disabled_projects(
                 &instance_id,
@@ -684,6 +798,49 @@ async fn run_request(
             apply_post_install_edit(&instance_id, post_install_edit).await?;
             Ok(Some(instance_id))
         }
+        InstallRequest::UpdateSharedInstance { instance_id, data } => {
+            prepare_existing_rollback(job_state, state, &instance_id).await?;
+            lock_existing_instance(&instance_id, state).await?;
+            let rollback_instance = job_state
+                .rollback
+                .as_ref()
+                .map(|rollback| rollback.instance.clone())
+                .ok_or_else(|| {
+                    crate::ErrorKind::OtherError(
+                        "Shared instance update rollback state is missing"
+                            .to_string(),
+                    )
+                })?;
+            let staging_dir = recovery::prepare_shared_instance_update_backup(
+                job_id,
+                &rollback_instance,
+                state,
+            )
+            .await?;
+            job_state.paths.staging_dir = Some(staging_dir);
+            let record = store::update_state(job_id, job_state, state).await?;
+            emit_install_job(&record.snapshot()).await?;
+            let disabled_project_ids =
+                disabled_project_ids(&instance_id, state).await?;
+            Box::pin(apply_shared_instance_update(
+                job_id,
+                job_state,
+                state,
+                &instance_id,
+                &data,
+            ))
+            .await?;
+            restore_disabled_projects(
+                &instance_id,
+                disabled_project_ids,
+                state,
+            )
+            .await?;
+            finalize_shared_instance_attachment(&instance_id, &data, state)
+                .await?;
+            emit_instance(&instance_id, InstancePayloadType::Edited).await?;
+            Ok(Some(instance_id))
+        }
     }
 }
 
@@ -714,6 +871,20 @@ async fn apply_post_install_edit(
     Ok(())
 }
 
+async fn disabled_project_ids(
+    instance_id: &str,
+    state: &State,
+) -> crate::Result<HashSet<String>> {
+    Ok(crate::state::instances::commands::list_project_files(
+        instance_id,
+        state,
+    )
+    .await?
+    .into_iter()
+    .filter_map(|file| (!file.enabled).then_some(file.project_id?))
+    .collect())
+}
+
 async fn remove_existing_pack_content(
     job_id: Uuid,
     job_state: &InstallJobState,
@@ -873,7 +1044,7 @@ async fn restore_disabled_projects(
     Ok(())
 }
 
-async fn install_pack(
+pub(super) async fn install_pack(
     job_id: Uuid,
     job_state: &mut InstallJobState,
     location: CreatePackLocation,
@@ -927,12 +1098,12 @@ async fn install_pack(
         }
     };
 
-    install_zipped_mrpack_files_with_reporter(
+    Box::pin(install_zipped_mrpack_files_with_reporter(
         create_pack,
         false,
         reason,
         reporter,
-    )
+    ))
     .await?;
 
     Ok(())
@@ -954,6 +1125,12 @@ async fn prepare_existing_rollback(
                 "Unknown instance {instance_id}"
             ))
         })?;
+    if instance.quarantined {
+        return Err(crate::ErrorKind::InputError(
+            "Content in quarantined instances cannot be changed.".to_string(),
+        )
+        .into());
+    }
     let install_stage = instance.instance.install_stage;
     set_display(
         job_state,
@@ -968,6 +1145,26 @@ async fn prepare_existing_rollback(
         instance_id: instance_id.to_string(),
     };
 
+    Ok(())
+}
+
+async fn lock_existing_instance_if_needed(
+    job_state: &InstallJobState,
+    state: &State,
+) -> crate::Result<()> {
+    if let InstallCleanup::RestoreExistingInstance { instance_id } =
+        &job_state.cleanup
+    {
+        lock_existing_instance(instance_id, state).await?;
+    }
+
+    Ok(())
+}
+
+async fn lock_existing_instance(
+    instance_id: &str,
+    state: &State,
+) -> crate::Result<()> {
     crate::state::instances::commands::set_instance_install_stage(
         instance_id,
         InstanceInstallStage::MinecraftInstalling,
@@ -979,7 +1176,26 @@ async fn prepare_existing_rollback(
     Ok(())
 }
 
-async fn update_progress(
+async fn finalize_existing_instance_success(
+    job_state: &InstallJobState,
+    state: &State,
+) -> crate::Result<()> {
+    if let InstallCleanup::RestoreExistingInstance { instance_id } =
+        &job_state.cleanup
+    {
+        crate::state::instances::commands::set_instance_install_stage(
+            instance_id,
+            InstanceInstallStage::Installed,
+            &state.pool,
+        )
+        .await?;
+        emit_instance(instance_id, InstancePayloadType::Edited).await?;
+    }
+
+    Ok(())
+}
+
+pub(super) async fn update_progress(
     job_id: Uuid,
     job_state: &mut InstallJobState,
     state: &State,
@@ -992,6 +1208,25 @@ async fn update_progress(
     Ok(())
 }
 
+pub(super) async fn update_content_progress(
+    job_id: Uuid,
+    job_state: &mut InstallJobState,
+    state: &State,
+    current: u64,
+    total: u64,
+) -> crate::Result<()> {
+    job_state.progress.phase = InstallPhaseId::DownloadingContent;
+    job_state.progress.progress = Some(InstallProgress {
+        current,
+        total,
+        secondary: None,
+    });
+    job_state.progress.details = InstallPhaseDetails::Empty;
+    let record = store::update_state(job_id, job_state, state).await?;
+    emit_install_job(&record.snapshot()).await?;
+    Ok(())
+}
+
 fn set_instance_id(job_state: &mut InstallJobState, instance_id: String) {
     job_state.target = match &job_state.target {
         InstallTarget::ExistingInstance { .. } => {
@@ -1036,12 +1271,16 @@ fn install_error_view(
     error: &crate::Error,
     context: Option<InstallErrorContext>,
 ) -> InstallErrorView {
-    InstallErrorView::from_error(
+    let mut view = InstallErrorView::from_error(
         install_error_code(phase, error),
         phase,
         error,
         context,
-    )
+    );
+    if let ErrorKind::SharedInstanceUnavailable(reason) = error.raw.as_ref() {
+        view.reason = Some(*reason);
+    }
+    view
 }
 
 fn install_error_code(
@@ -1051,6 +1290,9 @@ fn install_error_code(
     use InstallPhaseId::*;
 
     match error.raw.as_ref() {
+        ErrorKind::SharedInstanceUnavailable(_) => {
+            "shared_instance_unavailable"
+        }
         ErrorKind::InputError(_) => match phase {
             PreparingInstance | Finalizing => "instance_error",
             ResolvingPack | DownloadingPackFile | ReadingPackManifest => {
@@ -1079,6 +1321,8 @@ fn install_error_code(
         },
         ErrorKind::FetchError(_)
         | ErrorKind::ApiIsDownError(_)
+        | ErrorKind::WSError(_)
+        | ErrorKind::WSClosedError(_)
         | ErrorKind::Ratelimited { .. } => "network_error",
         ErrorKind::Any(_)
             if matches!(
@@ -1123,7 +1367,9 @@ fn current_instance_id(job_state: &InstallJobState) -> Option<String> {
     }
 }
 
-fn modpack_details(location: &CreatePackLocation) -> InstallPhaseDetails {
+pub(super) fn modpack_details(
+    location: &CreatePackLocation,
+) -> InstallPhaseDetails {
     match location {
         CreatePackLocation::FromVersionId {
             project_id,
diff --git a/packages/app-lib/src/install/shared_instance.rs b/packages/app-lib/src/install/shared_instance.rs
new file mode 100644
index 000000000..36cbbc157
--- /dev/null
+++ b/packages/app-lib/src/install/shared_instance.rs
@@ -0,0 +1,1016 @@
+use super::events::InstallProgressReporter;
+use super::model::{
+    InstallJobState, InstallPhaseDetails, InstallPhaseId,
+    SharedInstanceExternalFileData, SharedInstanceInstallData,
+    SharedInstanceInstallModpack,
+};
+use super::runner::{
+    install_pack, modpack_details, update_content_progress, update_progress,
+};
+use crate::api::instance::{
+    CONFIG_BUNDLE_FILE_TYPE, CONFIG_DIRECTORY, CONFIG_FILE_EXTENSIONS,
+    CONFIG_SYNC_ENABLED, MAX_CONFIG_BUNDLE_ENTRIES,
+    read_bounded_config_bundle_entry,
+};
+use crate::api::pack::install_from::CreatePackLocation;
+use crate::state::instances::adapters::sqlite::content_rows;
+use crate::state::{
+    CachedEntry, ContentSetSyncStatus, ContentSourceKind, InstanceLink,
+    ProjectType, SharedInstanceAttachmentInput, SharedInstanceRole, State,
+};
+use crate::util::fetch::{DownloadReason, REQWEST_CLIENT};
+use futures::StreamExt;
+use path_util::SafeRelativeUtf8UnixPathBuf;
+use std::collections::{HashMap, HashSet};
+use std::path::PathBuf;
+use uuid::Uuid;
+
+const MAX_SHARED_INSTANCE_EXTERNAL_FILE_SIZE: u64 = 500 * 1024 * 1024;
+const MAX_SHARED_INSTANCE_INITIAL_BUFFER_SIZE: u64 = 8 * 1024 * 1024;
+
+pub(super) async fn attach_pending_shared_instance(
+    instance_id: &str,
+    data: &SharedInstanceInstallData,
+    state: &State,
+) -> crate::Result<()> {
+    crate::state::attach_shared_instance(
+        instance_id,
+        SharedInstanceAttachmentInput {
+            id: data.shared_instance_id.clone(),
+            role: SharedInstanceRole::Member,
+            manager_id: data.manager_id.clone(),
+            server_manager_name: data.server_manager_name.clone(),
+            server_manager_icon_url: data.server_manager_icon_url.clone(),
+            linked_user_id: data.linked_user_id.clone(),
+            status: ContentSetSyncStatus::NotReady,
+            applied_version: None,
+            latest_version: Some(data.version),
+        },
+        &state.pool,
+    )
+    .await
+}
+
+pub(super) async fn finalize_shared_instance_attachment(
+    instance_id: &str,
+    data: &SharedInstanceInstallData,
+    state: &State,
+) -> crate::Result<()> {
+    crate::state::attach_shared_instance(
+        instance_id,
+        SharedInstanceAttachmentInput {
+            id: data.shared_instance_id.clone(),
+            role: SharedInstanceRole::Member,
+            manager_id: data.manager_id.clone(),
+            server_manager_name: data.server_manager_name.clone(),
+            server_manager_icon_url: data.server_manager_icon_url.clone(),
+            linked_user_id: data.linked_user_id.clone(),
+            status: ContentSetSyncStatus::UpToDate,
+            applied_version: Some(data.version),
+            latest_version: Some(data.version),
+        },
+        &state.pool,
+    )
+    .await
+}
+
+#[derive(Clone, Debug)]
+struct CurrentSharedInstanceProject {
+    project_id: String,
+    version_id: String,
+    relative_path: String,
+}
+
+#[derive(Clone, Debug)]
+struct CurrentSharedInstanceExternalFile {
+    relative_path: String,
+}
+
+type SharedInstanceExternalFileKey = (ProjectType, String);
+
+#[derive(Default)]
+struct CurrentSharedInstanceContent {
+    projects: HashMap<String, CurrentSharedInstanceProject>,
+    external_files: HashMap<
+        SharedInstanceExternalFileKey,
+        CurrentSharedInstanceExternalFile,
+    >,
+}
+
+#[derive(Clone, Debug)]
+struct DesiredSharedInstanceProject {
+    project_id: String,
+    version_id: String,
+}
+
+#[derive(Clone, Debug)]
+struct DesiredSharedInstanceExternalFile {
+    file: SharedInstanceExternalFileData,
+    file_type: ProjectType,
+}
+
+#[derive(Default)]
+struct DesiredSharedInstanceContent {
+    projects: HashMap<String, DesiredSharedInstanceProject>,
+    external_files: HashMap<
+        SharedInstanceExternalFileKey,
+        DesiredSharedInstanceExternalFile,
+    >,
+    config_bundle: Option<SharedInstanceExternalFileData>,
+}
+
+struct SharedInstanceProjectUpdate {
+    current: CurrentSharedInstanceProject,
+    desired: DesiredSharedInstanceProject,
+}
+
+#[derive(Default)]
+struct SharedInstanceApplyPlan {
+    configuration_changed: bool,
+    project_removals: Vec<CurrentSharedInstanceProject>,
+    project_updates: Vec<SharedInstanceProjectUpdate>,
+    project_additions: Vec<DesiredSharedInstanceProject>,
+    external_removals: Vec<CurrentSharedInstanceExternalFile>,
+    external_updates: Vec<DesiredSharedInstanceExternalFile>,
+    external_additions: Vec<DesiredSharedInstanceExternalFile>,
+    config_bundle: Option<SharedInstanceExternalFileData>,
+}
+
+impl SharedInstanceApplyPlan {
+    async fn build(
+        metadata: &crate::state::InstanceMetadata,
+        data: &SharedInstanceInstallData,
+        state: &State,
+    ) -> crate::Result<Self> {
+        if shared_instance_update_requires_full_apply(metadata, data) {
+            return Ok(Self {
+                configuration_changed: true,
+                ..Default::default()
+            });
+        }
+
+        let current = current_shared_instance_content(metadata, state).await?;
+        let desired = desired_shared_instance_content(data, state).await?;
+        let project_removals = current
+            .projects
+            .values()
+            .filter(|current| {
+                !desired.projects.contains_key(&current.project_id)
+            })
+            .cloned()
+            .collect();
+        let external_removals = current
+            .external_files
+            .iter()
+            .filter(|(key, _)| !desired.external_files.contains_key(*key))
+            .map(|(_, current)| current.clone())
+            .collect();
+        let mut plan = Self {
+            project_removals,
+            external_removals,
+            config_bundle: desired.config_bundle,
+            ..Default::default()
+        };
+
+        for desired in desired.projects.into_values() {
+            match current.projects.get(&desired.project_id) {
+                Some(current) if current.version_id != desired.version_id => {
+                    plan.project_updates.push(SharedInstanceProjectUpdate {
+                        current: current.clone(),
+                        desired,
+                    });
+                }
+                None => plan.project_additions.push(desired),
+                Some(_) => {}
+            }
+        }
+
+        for desired in desired.external_files.into_values() {
+            let key = (desired.file_type, desired.file.file_name.clone());
+            match current.external_files.get(&key) {
+                Some(_) => {
+                    plan.external_updates.push(desired);
+                }
+                _ => plan.external_additions.push(desired),
+            }
+        }
+
+        Ok(plan)
+    }
+
+    fn content_change_count(&self) -> u64 {
+        (self.project_updates.len()
+            + self.project_additions.len()
+            + self.external_updates.len()
+            + self.external_additions.len()
+            + usize::from(self.config_bundle.is_some())) as u64
+    }
+}
+
+pub(super) async fn apply_shared_instance_update(
+    job_id: Uuid,
+    job_state: &mut InstallJobState,
+    state: &State,
+    instance_id: &str,
+    data: &SharedInstanceInstallData,
+) -> crate::Result<()> {
+    let metadata = crate::state::instances::commands::get_instance_metadata(
+        instance_id,
+        &state.pool,
+    )
+    .await?
+    .ok_or_else(|| {
+        crate::ErrorKind::InputError("Unknown instance".to_string())
+    })?;
+    let plan = SharedInstanceApplyPlan::build(&metadata, data, state).await?;
+
+    if plan.configuration_changed {
+        remove_existing_shared_instance_content(instance_id, state).await?;
+        Box::pin(apply_shared_instance_content(
+            job_id,
+            job_state,
+            state,
+            instance_id,
+            data,
+        ))
+        .await?;
+        return Ok(());
+    }
+
+    update_progress(
+        job_id,
+        job_state,
+        state,
+        InstallPhaseId::PreparingInstance,
+        InstallPhaseDetails::Instance {
+            name: data.name.clone(),
+        },
+    )
+    .await?;
+
+    let content_change_count = plan.content_change_count();
+    if content_change_count > 0 {
+        update_content_progress(
+            job_id,
+            job_state,
+            state,
+            0,
+            content_change_count,
+        )
+        .await?;
+    }
+
+    for project in plan.project_removals {
+        crate::state::instances::commands::remove_project(
+            instance_id,
+            &project.relative_path,
+            state,
+        )
+        .await?;
+    }
+
+    for file in plan.external_removals {
+        crate::state::instances::commands::remove_project(
+            instance_id,
+            &file.relative_path,
+            state,
+        )
+        .await?;
+    }
+
+    let mut completed_content_changes = 0;
+    for update in plan.project_updates {
+        let new_path =
+            crate::state::instances::commands::add_project_from_version(
+                instance_id,
+                &update.desired.version_id,
+                DownloadReason::Update,
+                Some(update.current.version_id),
+                ContentSourceKind::SharedInstance,
+                state,
+            )
+            .await?;
+
+        if update.current.relative_path != new_path {
+            crate::state::instances::commands::remove_project(
+                instance_id,
+                &update.current.relative_path,
+                state,
+            )
+            .await?;
+        }
+        completed_content_changes += 1;
+        update_content_progress(
+            job_id,
+            job_state,
+            state,
+            completed_content_changes,
+            content_change_count,
+        )
+        .await?;
+    }
+
+    for project in plan.project_additions {
+        crate::state::instances::commands::add_project_from_version(
+            instance_id,
+            &project.version_id,
+            DownloadReason::Standalone,
+            None,
+            ContentSourceKind::SharedInstance,
+            state,
+        )
+        .await?;
+        completed_content_changes += 1;
+        update_content_progress(
+            job_id,
+            job_state,
+            state,
+            completed_content_changes,
+            content_change_count,
+        )
+        .await?;
+    }
+
+    for file in plan
+        .external_updates
+        .into_iter()
+        .chain(plan.external_additions)
+    {
+        install_shared_instance_external_file(instance_id, &file.file, state)
+            .await?;
+        completed_content_changes += 1;
+        update_content_progress(
+            job_id,
+            job_state,
+            state,
+            completed_content_changes,
+            content_change_count,
+        )
+        .await?;
+    }
+
+    if let Some(config_bundle) = plan.config_bundle {
+        install_shared_instance_external_file(
+            instance_id,
+            &config_bundle,
+            state,
+        )
+        .await?;
+        completed_content_changes += 1;
+        update_content_progress(
+            job_id,
+            job_state,
+            state,
+            completed_content_changes,
+            content_change_count,
+        )
+        .await?;
+    }
+
+    crate::api::instance::edit(
+        instance_id,
+        crate::state::EditInstance {
+            name: Some(data.name.clone()),
+            link: Some(shared_instance_link(data.modpack.as_ref())),
+            ..Default::default()
+        },
+    )
+    .await?;
+
+    Ok(())
+}
+
+fn shared_instance_update_requires_full_apply(
+    metadata: &crate::state::InstanceMetadata,
+    data: &SharedInstanceInstallData,
+) -> bool {
+    let (current_modpack_project_id, current_modpack_version_id) =
+        match &metadata.link {
+            InstanceLink::SharedInstance {
+                modpack_project_id,
+                modpack_version_id,
+            } => (modpack_project_id.as_deref(), modpack_version_id.as_deref()),
+            _ => return true,
+        };
+    let next_modpack_project_id = data
+        .modpack
+        .as_ref()
+        .map(|modpack| modpack.project_id.as_str());
+    let next_modpack_version_id = data
+        .modpack
+        .as_ref()
+        .map(|modpack| modpack.version_id.as_str());
+
+    current_modpack_project_id != next_modpack_project_id
+        || current_modpack_version_id != next_modpack_version_id
+        || metadata.applied_content_set.game_version != data.game_version
+        || metadata.applied_content_set.loader != data.loader
+        || metadata.applied_content_set.loader_version != data.loader_version
+}
+
+async fn current_shared_instance_content(
+    metadata: &crate::state::InstanceMetadata,
+    state: &State,
+) -> crate::Result<CurrentSharedInstanceContent> {
+    let entries = content_rows::get_content_entries(
+        &metadata.applied_content_set.id,
+        &state.pool,
+    )
+    .await?;
+    let files =
+        content_rows::get_instance_files(&metadata.instance.id, &state.pool)
+            .await?
+            .into_iter()
+            .map(|file| (file.id.clone(), file))
+            .collect::<HashMap<_, _>>();
+    let version_ids_without_project = entries
+        .iter()
+        .filter(|entry| entry.source_kind == ContentSourceKind::SharedInstance)
+        .filter(|entry| entry.project_id.is_none())
+        .filter_map(|entry| entry.version_id.clone())
+        .collect::<Vec<_>>();
+    let versions_by_id =
+        shared_instance_versions_by_id(&version_ids_without_project, state)
+            .await?;
+    let mut content = CurrentSharedInstanceContent::default();
+
+    for entry in entries {
+        if entry.source_kind != ContentSourceKind::SharedInstance {
+            continue;
+        }
+
+        let Some(file_id) = entry.file_id.as_ref() else {
+            continue;
+        };
+        let Some(file) = files.get(file_id) else {
+            continue;
+        };
+
+        if let Some(version_id) = entry.version_id.clone() {
+            let Some(project_id) = entry.project_id.clone().or_else(|| {
+                versions_by_id
+                    .get(&version_id)
+                    .map(|version| version.project_id.clone())
+            }) else {
+                continue;
+            };
+
+            content.projects.insert(
+                project_id.clone(),
+                CurrentSharedInstanceProject {
+                    project_id,
+                    version_id,
+                    relative_path: file.relative_path.clone(),
+                },
+            );
+        } else {
+            content.external_files.insert(
+                (entry.project_type, file.file_name.clone()),
+                CurrentSharedInstanceExternalFile {
+                    relative_path: file.relative_path.clone(),
+                },
+            );
+        }
+    }
+
+    Ok(content)
+}
+
+async fn desired_shared_instance_content(
+    data: &SharedInstanceInstallData,
+    state: &State,
+) -> crate::Result<DesiredSharedInstanceContent> {
+    let versions_by_id =
+        shared_instance_versions_by_id(&data.modrinth_ids, state).await?;
+    let mut content = DesiredSharedInstanceContent::default();
+
+    for version_id in &data.modrinth_ids {
+        let version = versions_by_id.get(version_id).ok_or_else(|| {
+            crate::ErrorKind::InputError(format!(
+                "Shared instance version {version_id} was not found"
+            ))
+        })?;
+        content.projects.insert(
+            version.project_id.clone(),
+            DesiredSharedInstanceProject {
+                project_id: version.project_id.clone(),
+                version_id: version.id.clone(),
+            },
+        );
+    }
+
+    for file in &data.external_files {
+        if file.file_type == CONFIG_BUNDLE_FILE_TYPE {
+            if CONFIG_SYNC_ENABLED {
+                content.config_bundle = Some(file.clone());
+            }
+            continue;
+        }
+        let file_type =
+            ProjectType::from_name(&file.file_type).ok_or_else(|| {
+                crate::ErrorKind::InputError(format!(
+                    "Unknown shared instance file type {}",
+                    file.file_type
+                ))
+            })?;
+        content.external_files.insert(
+            (file_type, file.file_name.clone()),
+            DesiredSharedInstanceExternalFile {
+                file: file.clone(),
+                file_type,
+            },
+        );
+    }
+
+    Ok(content)
+}
+
+async fn shared_instance_versions_by_id(
+    version_ids: &[String],
+    state: &State,
+) -> crate::Result<HashMap<String, crate::state::Version>> {
+    if version_ids.is_empty() {
+        return Ok(HashMap::new());
+    }
+
+    let mut ids = version_ids.iter().map(String::as_str).collect::<Vec<_>>();
+    ids.sort_unstable();
+    ids.dedup();
+    let versions = CachedEntry::get_version_many(
+        &ids,
+        None,
+        &state.pool,
+        &state.api_semaphore,
+    )
+    .await?;
+    let versions_by_id = versions
+        .into_iter()
+        .map(|version| (version.id.clone(), version))
+        .collect::<HashMap<_, _>>();
+
+    for id in ids {
+        if !versions_by_id.contains_key(id) {
+            return Err(crate::ErrorKind::InputError(format!(
+                "Shared instance version {id} was not found"
+            ))
+            .into());
+        }
+    }
+
+    Ok(versions_by_id)
+}
+
+pub(super) async fn apply_shared_instance_content(
+    job_id: Uuid,
+    job_state: &mut InstallJobState,
+    state: &State,
+    instance_id: &str,
+    data: &SharedInstanceInstallData,
+) -> crate::Result<()> {
+    update_progress(
+        job_id,
+        job_state,
+        state,
+        InstallPhaseId::PreparingInstance,
+        InstallPhaseDetails::Instance {
+            name: data.name.clone(),
+        },
+    )
+    .await?;
+
+    if let Some(modpack) = data.modpack.clone() {
+        let location = shared_instance_pack_location(modpack);
+        update_progress(
+            job_id,
+            job_state,
+            state,
+            InstallPhaseId::ResolvingPack,
+            modpack_details(&location),
+        )
+        .await?;
+        Box::pin(install_pack(
+            job_id,
+            job_state,
+            location,
+            instance_id.to_string(),
+            DownloadReason::Modpack,
+        ))
+        .await?;
+    } else {
+        crate::api::instance::edit(
+            instance_id,
+            crate::state::EditInstance {
+                content_set_patch: Some(crate::state::AppliedContentSetPatch {
+                    source_kind: Some(ContentSourceKind::SharedInstance),
+                    game_version: Some(data.game_version.clone()),
+                    protocol_version: Some(None),
+                    loader: Some(data.loader),
+                    loader_version: Some(data.loader_version.clone()),
+                }),
+                ..Default::default()
+            },
+        )
+        .await?;
+        update_progress(
+            job_id,
+            job_state,
+            state,
+            InstallPhaseId::DownloadingMinecraft,
+            InstallPhaseDetails::Minecraft {
+                game_version: data.game_version.clone(),
+                loader: data.loader,
+            },
+        )
+        .await?;
+        let context =
+            crate::state::instances::commands::get_instance_launch_context(
+                instance_id,
+                &state.pool,
+            )
+            .await?
+            .ok_or_else(|| {
+                crate::ErrorKind::InputError("Unknown instance".to_string())
+            })?;
+        crate::launcher::install_minecraft_with_reporter(
+            &context,
+            false,
+            Some(InstallProgressReporter::new(job_id, job_state.clone())),
+        )
+        .await?;
+    }
+
+    if !data.modrinth_ids.is_empty() || !data.external_files.is_empty() {
+        let content_change_count =
+            data.modrinth_ids.len() as u64 + data.external_files.len() as u64;
+        update_content_progress(
+            job_id,
+            job_state,
+            state,
+            0,
+            content_change_count,
+        )
+        .await?;
+        let mut completed_content_changes = 0;
+        for version_id in &data.modrinth_ids {
+            crate::state::instances::commands::add_project_from_version(
+                instance_id,
+                version_id,
+                DownloadReason::Standalone,
+                None,
+                ContentSourceKind::SharedInstance,
+                state,
+            )
+            .await?;
+            completed_content_changes += 1;
+            update_content_progress(
+                job_id,
+                job_state,
+                state,
+                completed_content_changes,
+                content_change_count,
+            )
+            .await?;
+        }
+
+        for file in &data.external_files {
+            install_shared_instance_external_file(instance_id, file, state)
+                .await?;
+            completed_content_changes += 1;
+            update_content_progress(
+                job_id,
+                job_state,
+                state,
+                completed_content_changes,
+                content_change_count,
+            )
+            .await?;
+        }
+    }
+
+    crate::api::instance::edit(
+        instance_id,
+        crate::state::EditInstance {
+            name: Some(data.name.clone()),
+            link: Some(shared_instance_link(data.modpack.as_ref())),
+            ..Default::default()
+        },
+    )
+    .await?;
+
+    Ok(())
+}
+
+pub(super) async fn remove_existing_shared_instance_content(
+    instance_id: &str,
+    state: &State,
+) -> crate::Result<()> {
+    let _content_lock = state.lock_instance_content(instance_id).await;
+    let metadata = crate::state::instances::commands::get_instance_metadata(
+        instance_id,
+        &state.pool,
+    )
+    .await?
+    .ok_or_else(|| {
+        crate::ErrorKind::InputError("Unknown instance".to_string())
+    })?;
+    let entries = content_rows::get_content_entries(
+        &metadata.applied_content_set.id,
+        &state.pool,
+    )
+    .await?;
+    let files = content_rows::get_instance_files(instance_id, &state.pool)
+        .await?
+        .into_iter()
+        .map(|file| (file.id.clone(), file))
+        .collect::<std::collections::HashMap<_, _>>();
+    let base = state
+        .directories
+        .instances_dir()
+        .join(&metadata.instance.path);
+
+    let mut removed_file_ids = HashSet::new();
+    for entry in entries {
+        if !entry.source_kind.is_shared_instance_managed() {
+            continue;
+        }
+
+        let Some(file_id) = entry.file_id else {
+            continue;
+        };
+        if !removed_file_ids.insert(file_id.clone()) {
+            continue;
+        }
+
+        let Some(file) = files.get(&file_id) else {
+            continue;
+        };
+        crate::util::io::remove_file(base.join(&file.relative_path)).await?;
+        let mut tx = state.pool.begin().await?;
+        content_rows::remove_content_entries_for_file(
+            &metadata.applied_content_set.id,
+            &file.id,
+            &mut tx,
+        )
+        .await?;
+        content_rows::remove_instance_file_by_relative_path(
+            instance_id,
+            &file.relative_path,
+            &mut tx,
+        )
+        .await?;
+        tx.commit().await?;
+    }
+
+    Ok(())
+}
+
+pub(super) fn shared_instance_pack_location(
+    modpack: SharedInstanceInstallModpack,
+) -> CreatePackLocation {
+    CreatePackLocation::FromVersionId {
+        project_id: modpack.project_id,
+        version_id: modpack.version_id,
+        title: modpack.title,
+        icon_url: modpack.icon_url,
+    }
+}
+
+pub(super) fn shared_instance_link(
+    modpack: Option<&SharedInstanceInstallModpack>,
+) -> InstanceLink {
+    InstanceLink::SharedInstance {
+        modpack_project_id: modpack.map(|modpack| modpack.project_id.clone()),
+        modpack_version_id: modpack.map(|modpack| modpack.version_id.clone()),
+    }
+}
+
+async fn install_shared_instance_external_file(
+    instance_id: &str,
+    file: &SharedInstanceExternalFileData,
+    state: &State,
+) -> crate::Result<()> {
+    if file.file_type == CONFIG_BUNDLE_FILE_TYPE && !CONFIG_SYNC_ENABLED {
+        return Ok(());
+    }
+
+    validate_shared_instance_external_file_name(&file.file_name)?;
+
+    if file.file_size > MAX_SHARED_INSTANCE_EXTERNAL_FILE_SIZE {
+        return Err(crate::ErrorKind::InputError(format!(
+            "Shared instance external file {} exceeds the maximum size",
+            file.file_name
+        ))
+        .into());
+    }
+
+    let response = REQWEST_CLIENT.get(&file.url).send().await?;
+
+    if !response.status().is_success() {
+        return Err(crate::ErrorKind::OtherError(format!(
+            "Shared instance external file download failed with status {}",
+            response.status()
+        ))
+        .into());
+    }
+
+    if response
+        .content_length()
+        .is_some_and(|content_length| content_length != file.file_size)
+    {
+        return Err(crate::ErrorKind::OtherError(format!(
+            "Shared instance external file {} has an unexpected size",
+            file.file_name
+        ))
+        .into());
+    }
+
+    let mut stream = response.bytes_stream();
+    let initial_capacity = usize::try_from(
+        file.file_size.min(MAX_SHARED_INSTANCE_INITIAL_BUFFER_SIZE),
+    )
+    .map_err(|_| {
+        crate::ErrorKind::InputError(format!(
+            "Shared instance external file {} is too large",
+            file.file_name
+        ))
+    })?;
+    let mut bytes = Vec::with_capacity(initial_capacity);
+    while let Some(chunk) = stream.next().await {
+        let chunk = chunk?;
+        let downloaded_size = (bytes.len() as u64)
+            .checked_add(chunk.len() as u64)
+            .ok_or_else(|| {
+                crate::ErrorKind::InputError(format!(
+                    "Shared instance external file {} is too large",
+                    file.file_name
+                ))
+            })?;
+        if downloaded_size > file.file_size {
+            return Err(crate::ErrorKind::OtherError(format!(
+                "Shared instance external file {} has an unexpected size",
+                file.file_name
+            ))
+            .into());
+        }
+        bytes.extend_from_slice(&chunk);
+    }
+
+    if bytes.len() as u64 != file.file_size {
+        return Err(crate::ErrorKind::OtherError(format!(
+            "Shared instance external file {} has an unexpected size",
+            file.file_name
+        ))
+        .into());
+    }
+    let bytes = bytes::Bytes::from(bytes);
+
+    if file.file_type == CONFIG_BUNDLE_FILE_TYPE {
+        return install_shared_instance_config_bundle(
+            instance_id,
+            bytes,
+            state,
+        )
+        .await;
+    }
+
+    let project_type =
+        ProjectType::from_name(&file.file_type).ok_or_else(|| {
+            crate::ErrorKind::InputError(format!(
+                "Unknown shared instance file type {}",
+                file.file_type
+            ))
+        })?;
+
+    crate::state::instances::commands::add_project_bytes(
+        instance_id,
+        &file.file_name,
+        bytes,
+        None,
+        Some(project_type),
+        ContentSourceKind::SharedInstance,
+        None,
+        None,
+        state,
+    )
+    .await?;
+
+    Ok(())
+}
+
+fn validate_shared_instance_external_file_name(
+    file_name: &str,
+) -> crate::Result<()> {
+    let path = SafeRelativeUtf8UnixPathBuf::try_from(file_name.to_string())
+        .map_err(|_| {
+            crate::ErrorKind::InputError(format!(
+                "Shared instance external file {file_name} has an invalid file name"
+            ))
+        })?;
+    if file_name == "."
+        || file_name.contains('/')
+        || file_name.contains('\\')
+        || path.components().count() != 1
+    {
+        return Err(crate::ErrorKind::InputError(format!(
+            "Shared instance external file {file_name} has an invalid file name"
+        ))
+        .into());
+    }
+
+    Ok(())
+}
+
+async fn install_shared_instance_config_bundle(
+    instance_id: &str,
+    bytes: bytes::Bytes,
+    state: &State,
+) -> crate::Result<()> {
+    let files =
+        tokio::task::spawn_blocking(move || read_config_bundle(bytes.as_ref()))
+            .await??;
+    let metadata = crate::state::instances::commands::get_instance_metadata(
+        instance_id,
+        &state.pool,
+    )
+    .await?
+    .ok_or_else(|| {
+        crate::ErrorKind::InputError("Unknown instance".to_string())
+    })?;
+    let config_path = state
+        .directories
+        .instances_dir()
+        .join(metadata.instance.path)
+        .join(CONFIG_DIRECTORY);
+    crate::util::io::create_dir_all(&config_path).await?;
+
+    for (relative_path, bytes) in files {
+        let path = config_path.join(relative_path);
+        if let Some(parent) = path.parent() {
+            crate::util::io::create_dir_all(parent).await?;
+        }
+        crate::util::io::write(path, bytes).await?;
+    }
+
+    Ok(())
+}
+
+fn read_config_bundle(bytes: &[u8]) -> crate::Result<Vec<(PathBuf, Vec<u8>)>> {
+    let mut archive = zip::ZipArchive::new(std::io::Cursor::new(bytes))
+        .map_err(|error| {
+            crate::ErrorKind::InputError(format!(
+                "Invalid shared instance config bundle: {error}"
+            ))
+        })?;
+    if archive.len() > MAX_CONFIG_BUNDLE_ENTRIES {
+        return Err(crate::ErrorKind::InputError(
+            "Shared instance config bundle contains too many entries"
+                .to_string(),
+        )
+        .into());
+    }
+    let mut files = Vec::new();
+    let mut total_size = 0;
+
+    for index in 0..archive.len() {
+        let file = archive.by_index(index).map_err(|error| {
+            crate::ErrorKind::InputError(format!(
+                "Invalid shared instance config bundle entry: {error}"
+            ))
+        })?;
+        if file.is_dir() {
+            continue;
+        }
+        let path = file.enclosed_name().ok_or_else(|| {
+            crate::ErrorKind::InputError(
+                "Shared instance config bundle contains an unsafe path"
+                    .to_string(),
+            )
+        })?;
+        if !is_supported_config_file(&path) {
+            return Err(crate::ErrorKind::InputError(format!(
+                "Shared instance config bundle contains unsupported file {}",
+                path.display()
+            ))
+            .into());
+        }
+        let declared_size = file.size();
+        let bytes = read_bounded_config_bundle_entry(
+            file,
+            declared_size,
+            &mut total_size,
+        )?;
+        files.push((path.to_path_buf(), bytes));
+    }
+
+    Ok(files)
+}
+
+fn is_supported_config_file(path: &std::path::Path) -> bool {
+    path.extension()
+        .and_then(|extension| extension.to_str())
+        .is_some_and(|extension| {
+            CONFIG_FILE_EXTENSIONS
+                .iter()
+                .any(|candidate| extension.eq_ignore_ascii_case(candidate))
+        })
+}
diff --git a/packages/app-lib/src/launcher/mod.rs b/packages/app-lib/src/launcher/mod.rs
index d178335cf..55783693b 100644
--- a/packages/app-lib/src/launcher/mod.rs
+++ b/packages/app-lib/src/launcher/mod.rs
@@ -290,6 +290,7 @@ pub async fn install_minecraft_with_reporter(
     };
 
     let state = State::get().await?;
+    let previous_install_stage = instance.install_stage;
 
     crate::state::instances::commands::set_instance_install_stage(
         &instance.id,
@@ -299,6 +300,7 @@ pub async fn install_minecraft_with_reporter(
     .await?;
     emit_instance(&instance.id, InstancePayloadType::Edited).await?;
 
+    let result = async {
     let instance_path = get_instance_full_path(&instance.path).await?;
     if let Some(reporter) = &reporter {
         reporter
@@ -618,7 +620,34 @@ pub async fn install_minecraft_with_reporter(
         emit_loading(loading_bar, 1.0, Some("Finished installing"))?;
     }
 
-    Ok(())
+    Ok::<(), crate::Error>(())
+    }
+    .await;
+
+    if result.is_err() {
+        if let Err(error) =
+            crate::state::instances::commands::set_instance_install_stage(
+                &instance.id,
+                previous_install_stage,
+                &state.pool,
+            )
+            .await
+        {
+            tracing::error!(
+                "Failed to restore install stage for instance {}: {error}",
+                instance.id
+            );
+        } else if let Err(error) =
+            emit_instance(&instance.id, InstancePayloadType::Edited).await
+        {
+            tracing::error!(
+                "Failed to emit restored install stage for instance {}: {error}",
+                instance.id
+            );
+        }
+    }
+
+    result
 }
 
 pub async fn install_minecraft_for_instance_id_with_reporter(
diff --git a/packages/app-lib/src/state/friends.rs b/packages/app-lib/src/state/friends.rs
index 9e59febeb..730d54fe3 100644
--- a/packages/app-lib/src/state/friends.rs
+++ b/packages/app-lib/src/state/friends.rs
@@ -240,6 +240,11 @@ impl FriendsSocket {
     }
 
     async fn handle_notification(notification: Value) -> crate::Result<()> {
+        tracing::info!(
+            notification = %notification,
+            "Received websocket notification payload"
+        );
+
         if notification
             .get("body")
             .and_then(|body| body.get("type"))
diff --git a/packages/app-lib/src/state/instance_types.rs b/packages/app-lib/src/state/instance_types.rs
index 4fefab25a..c3b6567fa 100644
--- a/packages/app-lib/src/state/instance_types.rs
+++ b/packages/app-lib/src/state/instance_types.rs
@@ -1,6 +1,8 @@
 use serde::{Deserialize, Serialize};
 use std::path::Path;
 
+use super::instances::ContentSourceKind;
+
 #[derive(Serialize, Deserialize, Clone, Copy, Debug, Eq, PartialEq)]
 #[serde(rename_all = "snake_case")]
 pub enum InstanceInstallStage {
@@ -122,6 +124,7 @@ pub struct ContentFile {
     pub metadata: Option<FileMetadata>,
     pub update_version_id: Option<String>,
     pub project_type: ProjectType,
+    pub source_kind: Option<ContentSourceKind>,
 }
 
 #[derive(Debug, Serialize, Deserialize, Clone)]
@@ -130,7 +133,7 @@ pub struct FileMetadata {
     pub version_id: String,
 }
 
-#[derive(Serialize, Deserialize, Clone, Debug, Copy, PartialEq, Eq)]
+#[derive(Serialize, Deserialize, Clone, Debug, Copy, PartialEq, Eq, Hash)]
 #[serde(rename_all = "lowercase")]
 pub enum ProjectType {
     Mod,
@@ -186,6 +189,18 @@ impl ProjectType {
         }
     }
 
+    pub fn from_name(name: &str) -> Option<Self> {
+        match name {
+            "mod" | "mods" => Some(ProjectType::Mod),
+            "datapack" | "datapacks" => Some(ProjectType::DataPack),
+            "resourcepack" | "resourcepacks" => Some(ProjectType::ResourcePack),
+            "shader" | "shaderpack" | "shaderpacks" => {
+                Some(ProjectType::ShaderPack)
+            }
+            _ => None,
+        }
+    }
+
     pub fn get_folder(&self) -> &'static str {
         match self {
             ProjectType::Mod => "mods",
diff --git a/packages/app-lib/src/state/instances/adapters/filesystem.rs b/packages/app-lib/src/state/instances/adapters/filesystem.rs
index 73c8ce4f5..2d054fc90 100644
--- a/packages/app-lib/src/state/instances/adapters/filesystem.rs
+++ b/packages/app-lib/src/state/instances/adapters/filesystem.rs
@@ -89,6 +89,9 @@ fn is_scannable_project_file(
         ProjectType::Mod => extension.eq_ignore_ascii_case("jar"),
         ProjectType::DataPack
         | ProjectType::ResourcePack
-        | ProjectType::ShaderPack => extension.eq_ignore_ascii_case("zip"),
+        | ProjectType::ShaderPack => {
+            extension.eq_ignore_ascii_case("zip")
+                || extension.eq_ignore_ascii_case("jar")
+        }
     }
 }
diff --git a/packages/app-lib/src/state/instances/adapters/sqlite/content_rows.rs b/packages/app-lib/src/state/instances/adapters/sqlite/content_rows.rs
index 74a58bf93..ff51044eb 100644
--- a/packages/app-lib/src/state/instances/adapters/sqlite/content_rows.rs
+++ b/packages/app-lib/src/state/instances/adapters/sqlite/content_rows.rs
@@ -374,6 +374,56 @@ where
     rows.into_iter().map(TryInto::try_into).collect()
 }
 
+pub(crate) async fn upsert_content_set_remote_ref(
+    remote_ref: &ContentSetRemoteRef,
+    tx: &mut Transaction<'_, Sqlite>,
+) -> crate::Result<()> {
+    let content_set_id = remote_ref.content_set_id.as_str();
+    let ref_type = remote_ref.ref_type.as_str();
+    let ref_id = remote_ref.ref_id.as_str();
+
+    sqlx::query!(
+        "
+		INSERT INTO instance_content_set_remote_refs (
+			content_set_id,
+			ref_type,
+			ref_id
+		)
+		VALUES (?, ?, ?)
+		ON CONFLICT (content_set_id, ref_type) DO UPDATE SET
+			ref_id = excluded.ref_id
+		",
+        content_set_id,
+        ref_type,
+        ref_id,
+    )
+    .execute(&mut **tx)
+    .await?;
+
+    Ok(())
+}
+
+pub(crate) async fn delete_content_set_remote_ref(
+    content_set_id: &str,
+    ref_type: ContentSetRemoteRefType,
+    tx: &mut Transaction<'_, Sqlite>,
+) -> crate::Result<()> {
+    let ref_type = ref_type.as_str();
+
+    sqlx::query!(
+        "
+		DELETE FROM instance_content_set_remote_refs
+		WHERE content_set_id = ? AND ref_type = ?
+		",
+        content_set_id,
+        ref_type,
+    )
+    .execute(&mut **tx)
+    .await?;
+
+    Ok(())
+}
+
 pub(crate) async fn get_content_set_sync_state<'e, E>(
     content_set_id: &str,
     exec: E,
@@ -396,6 +446,66 @@ where
     row.map(TryInto::try_into).transpose()
 }
 
+pub(crate) async fn upsert_content_set_sync_state(
+    sync_state: &ContentSetSyncState,
+    tx: &mut Transaction<'_, Sqlite>,
+) -> crate::Result<()> {
+    let content_set_id = sync_state.content_set_id.as_str();
+    let provider = sync_state.provider.as_str();
+    let applied_update_id = sync_state.applied_update_id.as_deref();
+    let latest_available_update_id =
+        sync_state.latest_available_update_id.as_deref();
+    let checked_at = sync_state.checked_at.map(|value| value.timestamp());
+    let status = sync_state.status.as_str();
+
+    sqlx::query!(
+        "
+		INSERT INTO instance_content_set_sync_state (
+			content_set_id,
+			provider,
+			applied_update_id,
+			latest_available_update_id,
+			checked_at,
+			status
+		)
+		VALUES (?, ?, ?, ?, ?, ?)
+		ON CONFLICT (content_set_id) DO UPDATE SET
+			provider = excluded.provider,
+			applied_update_id = excluded.applied_update_id,
+			latest_available_update_id = excluded.latest_available_update_id,
+			checked_at = excluded.checked_at,
+			status = excluded.status
+		",
+        content_set_id,
+        provider,
+        applied_update_id,
+        latest_available_update_id,
+        checked_at,
+        status,
+    )
+    .execute(&mut **tx)
+    .await?;
+
+    Ok(())
+}
+
+pub(crate) async fn delete_content_set_sync_state(
+    content_set_id: &str,
+    tx: &mut Transaction<'_, Sqlite>,
+) -> crate::Result<()> {
+    sqlx::query!(
+        "
+		DELETE FROM instance_content_set_sync_state
+		WHERE content_set_id = ?
+		",
+        content_set_id,
+    )
+    .execute(&mut **tx)
+    .await?;
+
+    Ok(())
+}
+
 pub(crate) async fn get_instance_files<'e, E>(
     instance_id: &str,
     exec: E,
@@ -523,6 +633,100 @@ pub(crate) async fn upsert_instance_file(
     row.try_into()
 }
 
+async fn insert_content_entry(
+    entry: &ContentEntry,
+    tx: &mut Transaction<'_, Sqlite>,
+) -> crate::Result<()> {
+    let id = entry.id.as_str();
+    let instance_id = entry.instance_id.as_str();
+    let content_set_id = entry.content_set_id.as_str();
+    let file_id = entry.file_id.as_deref();
+    let project_type = entry.project_type.get_name();
+    let project_id = entry.project_id.as_deref();
+    let version_id = entry.version_id.as_deref();
+    let source_kind = entry.source_kind.as_str();
+    let server_requirement = entry.server_requirement.as_str();
+    let client_requirement = entry.client_requirement.as_str();
+    let enabled = i64::from(entry.enabled);
+    let added_at = entry.added_at.timestamp();
+    let modified_at = entry.modified_at.timestamp();
+
+    sqlx::query(
+        "
+		INSERT INTO instance_content_entries (
+			id,
+			instance_id,
+			content_set_id,
+			file_id,
+			project_type,
+			project_id,
+			version_id,
+			source_kind,
+			server_requirement,
+			client_requirement,
+			enabled,
+			added_at,
+			modified_at
+		)
+		VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+		",
+    )
+    .bind(id)
+    .bind(instance_id)
+    .bind(content_set_id)
+    .bind(file_id)
+    .bind(project_type)
+    .bind(project_id)
+    .bind(version_id)
+    .bind(source_kind)
+    .bind(server_requirement)
+    .bind(client_requirement)
+    .bind(enabled)
+    .bind(added_at)
+    .bind(modified_at)
+    .execute(&mut **tx)
+    .await?;
+
+    Ok(())
+}
+
+pub(crate) async fn restore_instance_content_snapshot(
+    instance_id: &str,
+    files: &[InstanceFile],
+    entries: &[ContentEntry],
+    pool: &SqlitePool,
+) -> crate::Result<()> {
+    let mut tx = pool.begin().await?;
+    sqlx::query(
+        "
+		DELETE FROM instance_content_entries
+		WHERE instance_id = ?
+		",
+    )
+    .bind(instance_id)
+    .execute(&mut *tx)
+    .await?;
+    sqlx::query(
+        "
+		DELETE FROM instance_files
+		WHERE instance_id = ?
+		",
+    )
+    .bind(instance_id)
+    .execute(&mut *tx)
+    .await?;
+
+    for file in files {
+        upsert_instance_file(file, &mut tx).await?;
+    }
+    for entry in entries {
+        insert_content_entry(entry, &mut tx).await?;
+    }
+
+    tx.commit().await?;
+    Ok(())
+}
+
 pub(crate) async fn get_content_entries<'e, E>(
     content_set_id: &str,
     exec: E,
@@ -1091,16 +1295,12 @@ pub(crate) async fn upsert_content_update_check(
 }
 
 fn project_type_from_str(value: &str) -> crate::Result<ProjectType> {
-    match value {
-        "mod" => Ok(ProjectType::Mod),
-        "datapack" => Ok(ProjectType::DataPack),
-        "resourcepack" => Ok(ProjectType::ResourcePack),
-        "shader" | "shaderpack" => Ok(ProjectType::ShaderPack),
-        other => Err(crate::ErrorKind::InputError(format!(
-            "Unknown content project type {other}"
+    ProjectType::from_name(value).ok_or_else(|| {
+        crate::ErrorKind::InputError(format!(
+            "Unknown content project type {value}"
         ))
-        .into()),
-    }
+        .into()
+    })
 }
 
 fn timestamp(value: i64) -> DateTime<Utc> {
diff --git a/packages/app-lib/src/state/instances/adapters/sqlite/instance_rows.rs b/packages/app-lib/src/state/instances/adapters/sqlite/instance_rows.rs
index 5a4a0e614..6e97bf4ab 100644
--- a/packages/app-lib/src/state/instances/adapters/sqlite/instance_rows.rs
+++ b/packages/app-lib/src/state/instances/adapters/sqlite/instance_rows.rs
@@ -1,9 +1,10 @@
 #![allow(dead_code)]
 
 use crate::state::instances::{
-    ContentSet, ContentSetStatus, ContentSourceKind, Instance,
-    InstanceLaunchContext, InstanceLaunchOverrides,
-    InstanceLaunchOverridesData, InstanceLink, playtime_to_storage,
+    ContentSet, ContentSetStatus, ContentSetSyncStatus, ContentSourceKind,
+    Instance, InstanceLaunchContext, InstanceLaunchOverrides,
+    InstanceLaunchOverridesData, InstanceLink, SharedInstanceAttachment,
+    SharedInstanceRole, playtime_to_storage,
 };
 use crate::state::{
     InstanceInstallStage, LauncherFeatureVersion, ModLoader, ReleaseChannel,
@@ -73,6 +74,9 @@ pub(crate) struct InstanceLinkRow {
     pub hosting_instance_ids: Option<String>,
     pub hosting_active_instance_id: Option<String>,
     pub shared_instance_id: Option<String>,
+    pub shared_instance_role: Option<String>,
+    pub shared_instance_manager_id: Option<String>,
+    pub shared_instance_linked_user_id: Option<String>,
     pub imported_name: Option<String>,
     pub imported_version_number: Option<String>,
     pub imported_filename: Option<String>,
@@ -137,10 +141,8 @@ impl TryFrom<InstanceLinkRow> for InstanceLink {
                 filename: row.imported_filename,
             }),
             "shared_instance" => Ok(Self::SharedInstance {
-                shared_instance_id: parse_uuid(
-                    row.shared_instance_id,
-                    "shared_instance_id",
-                )?,
+                modpack_project_id: row.modrinth_project_id,
+                modpack_version_id: row.modrinth_version_id,
             }),
             other => Err(crate::ErrorKind::InputError(format!(
                 "Unknown instance link kind {other}"
@@ -161,6 +163,7 @@ pub(crate) struct InstanceMetadataRecord {
     pub instance: Instance,
     pub applied_content_set: ContentSet,
     pub link: InstanceLink,
+    pub shared_instance: Option<SharedInstanceAttachment>,
     pub groups: Vec<String>,
     pub launch_overrides: InstanceLaunchOverrides,
 }
@@ -207,6 +210,14 @@ struct InstanceMetadataRow {
     hosting_instance_ids: Option<String>,
     hosting_active_instance_id: Option<String>,
     shared_instance_id: Option<String>,
+    shared_instance_role: Option<String>,
+    shared_instance_manager_id: Option<String>,
+    shared_instance_server_manager_name: Option<String>,
+    shared_instance_server_manager_icon_url: Option<String>,
+    shared_instance_linked_user_id: Option<String>,
+    shared_sync_applied_update_id: Option<String>,
+    shared_sync_latest_available_update_id: Option<String>,
+    shared_sync_status: Option<String>,
     imported_name: Option<String>,
     imported_version_number: Option<String>,
     imported_filename: Option<String>,
@@ -300,12 +311,28 @@ impl InstanceMetadataRow {
             hosting_server_id: self.hosting_server_id,
             hosting_instance_ids: self.hosting_instance_ids,
             hosting_active_instance_id: self.hosting_active_instance_id,
-            shared_instance_id: self.shared_instance_id,
+            shared_instance_id: self.shared_instance_id.clone(),
+            shared_instance_role: self.shared_instance_role.clone(),
+            shared_instance_manager_id: self.shared_instance_manager_id.clone(),
+            shared_instance_linked_user_id: self
+                .shared_instance_linked_user_id
+                .clone(),
             imported_name: self.imported_name,
             imported_version_number: self.imported_version_number,
             imported_filename: self.imported_filename,
         }
         .try_into()?;
+        let shared_instance = shared_instance_attachment(
+            self.shared_instance_id,
+            self.shared_instance_role,
+            self.shared_instance_manager_id,
+            self.shared_instance_server_manager_name,
+            self.shared_instance_server_manager_icon_url,
+            self.shared_instance_linked_user_id,
+            self.shared_sync_status,
+            self.shared_sync_applied_update_id,
+            self.shared_sync_latest_available_update_id,
+        )?;
         let groups = parse_groups(self.groups)?;
         let launch_overrides =
             launch_overrides_from_json(instance_id, self.launch_overrides)?;
@@ -314,6 +341,7 @@ impl InstanceMetadataRow {
             instance,
             applied_content_set,
             link,
+            shared_instance,
             groups,
             launch_overrides,
         })
@@ -418,75 +446,173 @@ where
     Ok(row)
 }
 
+pub(crate) async fn is_instance_quarantined<'e, E>(
+    instance_id: &str,
+    exec: E,
+) -> crate::Result<bool>
+where
+    E: Executor<'e, Database = Sqlite>,
+{
+    let quarantined = sqlx::query_scalar::<_, bool>(
+        "
+		SELECT EXISTS (
+			SELECT 1
+			FROM instance_quarantines
+			WHERE instance_id = ?
+		)
+		",
+    )
+    .bind(instance_id)
+    .fetch_one(exec)
+    .await?;
+
+    Ok(quarantined)
+}
+
+pub(crate) async fn get_quarantined_instance_ids<'e, E>(
+    exec: E,
+) -> crate::Result<std::collections::HashSet<String>>
+where
+    E: Executor<'e, Database = Sqlite>,
+{
+    let instance_ids = sqlx::query_scalar::<_, String>(
+        "
+		SELECT instance_id
+		FROM instance_quarantines
+		",
+    )
+    .fetch_all(exec)
+    .await?;
+
+    Ok(instance_ids.into_iter().collect())
+}
+
+pub(crate) async fn set_instance_quarantined(
+    instance_id: &str,
+    quarantined: bool,
+    tx: &mut Transaction<'_, Sqlite>,
+) -> crate::Result<()> {
+    if quarantined {
+        sqlx::query(
+            "
+			INSERT INTO instance_quarantines (instance_id)
+			VALUES (?)
+			ON CONFLICT (instance_id) DO NOTHING
+			",
+        )
+        .bind(instance_id)
+        .execute(&mut **tx)
+        .await?;
+    } else {
+        sqlx::query(
+            "
+			DELETE FROM instance_quarantines
+			WHERE instance_id = ?
+			",
+        )
+        .bind(instance_id)
+        .execute(&mut **tx)
+        .await?;
+    }
+
+    Ok(())
+}
+
+macro_rules! query_instance_metadata {
+    (
+        $prefix:literal,
+        $from:literal,
+        $suffix:literal,
+        $arg:expr $(,)?
+    ) => {
+        sqlx::query_as!(
+            InstanceMetadataRow,
+            $prefix
+                + r#"
+                SELECT
+                    i.id AS "id!: String",
+                    i.path AS "path!: String",
+                    i.applied_content_set_id AS "applied_content_set_id?: String",
+                    i.install_stage AS "install_stage!: String",
+                    i.launcher_feature_version AS "launcher_feature_version!: String",
+                    i.update_channel AS "update_channel!: String",
+                    i.name AS "name!: String",
+                    i.icon_path AS "icon_path?: String",
+                    i.created AS "created!: i64",
+                    i.modified AS "modified!: i64",
+                    i.last_played AS "last_played?: i64",
+                    i.submitted_time_played AS "submitted_time_played!: i64",
+                    i.recent_time_played AS "recent_time_played!: i64",
+                    cs.id AS "content_set_id?: String",
+                    cs.instance_id AS "content_set_instance_id?: String",
+                    cs.name AS "content_set_name?: String",
+                    cs.source_kind AS "content_set_source_kind?: String",
+                    cs.status AS "content_set_status?: String",
+                    cs.game_version AS "content_set_game_version?: String",
+                    cs.protocol_version AS "content_set_protocol_version?: i64",
+                    cs.loader AS "content_set_loader?: String",
+                    cs.loader_version AS "content_set_loader_version?: String",
+                    cs.created AS "content_set_created?: i64",
+                    cs.modified AS "content_set_modified?: i64",
+                    COALESCE(link.link_kind, 'unmanaged') AS "link_kind!: String",
+                    link.modrinth_project_id AS "modrinth_project_id?: String",
+                    link.modrinth_version_id AS "modrinth_version_id?: String",
+                    link.server_project_id AS "server_project_id?: String",
+                    link.content_project_id AS "content_project_id?: String",
+                    link.content_version_id AS "content_version_id?: String",
+                    link.hosting_server_id AS "hosting_server_id?: String",
+                    json(link.hosting_instance_ids) AS "hosting_instance_ids?: String",
+                    link.hosting_active_instance_id AS "hosting_active_instance_id?: String",
+                    link.shared_instance_id AS "shared_instance_id?: String",
+                    link.shared_instance_role AS "shared_instance_role?: String",
+                    link.shared_instance_manager_id AS "shared_instance_manager_id?: String",
+                    link.shared_instance_server_manager_name AS "shared_instance_server_manager_name?: String",
+                    link.shared_instance_server_manager_icon_url AS "shared_instance_server_manager_icon_url?: String",
+                    link.shared_instance_linked_user_id AS "shared_instance_linked_user_id?: String",
+                    sync.applied_update_id AS "shared_sync_applied_update_id?: String",
+                    sync.latest_available_update_id AS "shared_sync_latest_available_update_id?: String",
+                    sync.status AS "shared_sync_status?: String",
+                    link.imported_name AS "imported_name?: String",
+                    link.imported_version_number AS "imported_version_number?: String",
+                    link.imported_filename AS "imported_filename?: String",
+                    COALESCE((
+                        SELECT json_group_array(group_name)
+                        FROM (
+                            SELECT group_name
+                            FROM instance_groups
+                            WHERE instance_id = i.id
+                            ORDER BY group_name
+                        )
+                    ), '[]') AS "groups!: String",
+                    json(overrides.overrides) AS "launch_overrides?: String"
+                "#
+                + $from
+                + r#"
+                LEFT JOIN instance_content_sets cs
+                    ON cs.id = i.applied_content_set_id
+                    AND cs.instance_id = i.id
+                LEFT JOIN instance_links link
+                    ON link.instance_id = i.id
+                LEFT JOIN instance_content_set_sync_state sync
+                    ON sync.content_set_id = cs.id
+                    AND sync.provider = 'shared_instance'
+                LEFT JOIN instance_launch_overrides overrides
+                    ON overrides.instance_id = i.id
+                "#
+                + $suffix,
+            $arg,
+        )
+    };
+}
+
 pub(crate) async fn get_instance_metadata_by_id(
     id: &str,
     pool: &SqlitePool,
 ) -> crate::Result<Option<InstanceMetadataRecord>> {
-    let row = sqlx::query_as!(
-        InstanceMetadataRow,
-        r#"
-        SELECT
-            i.id AS "id!: String",
-            i.path AS "path!: String",
-            i.applied_content_set_id AS "applied_content_set_id?: String",
-            i.install_stage AS "install_stage!: String",
-            i.launcher_feature_version AS "launcher_feature_version!: String",
-            i.update_channel AS "update_channel!: String",
-            i.name AS "name!: String",
-            i.icon_path AS "icon_path?: String",
-            i.created AS "created!: i64",
-            i.modified AS "modified!: i64",
-            i.last_played AS "last_played?: i64",
-            i.submitted_time_played AS "submitted_time_played!: i64",
-            i.recent_time_played AS "recent_time_played!: i64",
-            cs.id AS "content_set_id?: String",
-            cs.instance_id AS "content_set_instance_id?: String",
-            cs.name AS "content_set_name?: String",
-            cs.source_kind AS "content_set_source_kind?: String",
-            cs.status AS "content_set_status?: String",
-            cs.game_version AS "content_set_game_version?: String",
-            cs.protocol_version AS "content_set_protocol_version?: i64",
-            cs.loader AS "content_set_loader?: String",
-            cs.loader_version AS "content_set_loader_version?: String",
-            cs.created AS "content_set_created?: i64",
-            cs.modified AS "content_set_modified?: i64",
-            COALESCE(link.link_kind, 'unmanaged') AS "link_kind!: String",
-            link.modrinth_project_id AS "modrinth_project_id?: String",
-            link.modrinth_version_id AS "modrinth_version_id?: String",
-            link.server_project_id AS "server_project_id?: String",
-            link.content_project_id AS "content_project_id?: String",
-            link.content_version_id AS "content_version_id?: String",
-            link.hosting_server_id AS "hosting_server_id?: String",
-            json(link.hosting_instance_ids) AS "hosting_instance_ids?: String",
-            link.hosting_active_instance_id AS "hosting_active_instance_id?: String",
-            link.shared_instance_id AS "shared_instance_id?: String",
-            link.imported_name AS "imported_name?: String",
-            link.imported_version_number AS "imported_version_number?: String",
-            link.imported_filename AS "imported_filename?: String",
-            COALESCE((
-                SELECT json_group_array(group_name)
-                FROM (
-                    SELECT group_name
-                    FROM instance_groups
-                    WHERE instance_id = i.id
-                    ORDER BY group_name
-                )
-            ), '[]') AS "groups!: String",
-            json(overrides.overrides) AS "launch_overrides?: String"
-        FROM instances i
-        LEFT JOIN instance_content_sets cs
-            ON cs.id = i.applied_content_set_id
-            AND cs.instance_id = i.id
-        LEFT JOIN instance_links link
-            ON link.instance_id = i.id
-        LEFT JOIN instance_launch_overrides overrides
-            ON overrides.instance_id = i.id
-        WHERE i.id = ?
-        "#,
-        id,
-    )
-    .fetch_optional(pool)
-    .await?;
+    let row =
+        query_instance_metadata!("", "FROM instances i", "WHERE i.id = ?", id,)
+            .fetch_optional(pool)
+            .await?;
 
     row.map(InstanceMetadataRow::into_record).transpose()
 }
@@ -500,73 +626,19 @@ pub(crate) async fn get_instance_metadata_many(
     }
 
     let ids_json = serde_json::to_string(ids)?;
-    let rows = sqlx::query_as!(
-        InstanceMetadataRow,
+    let rows = query_instance_metadata!(
         r#"
         WITH requested AS (
             SELECT value AS id, key AS ord
             FROM json_each(?)
         )
-        SELECT
-            i.id AS "id!: String",
-            i.path AS "path!: String",
-            i.applied_content_set_id AS "applied_content_set_id?: String",
-            i.install_stage AS "install_stage!: String",
-            i.launcher_feature_version AS "launcher_feature_version!: String",
-            i.update_channel AS "update_channel!: String",
-            i.name AS "name!: String",
-            i.icon_path AS "icon_path?: String",
-            i.created AS "created!: i64",
-            i.modified AS "modified!: i64",
-            i.last_played AS "last_played?: i64",
-            i.submitted_time_played AS "submitted_time_played!: i64",
-            i.recent_time_played AS "recent_time_played!: i64",
-            cs.id AS "content_set_id?: String",
-            cs.instance_id AS "content_set_instance_id?: String",
-            cs.name AS "content_set_name?: String",
-            cs.source_kind AS "content_set_source_kind?: String",
-            cs.status AS "content_set_status?: String",
-            cs.game_version AS "content_set_game_version?: String",
-            cs.protocol_version AS "content_set_protocol_version?: i64",
-            cs.loader AS "content_set_loader?: String",
-            cs.loader_version AS "content_set_loader_version?: String",
-            cs.created AS "content_set_created?: i64",
-            cs.modified AS "content_set_modified?: i64",
-            COALESCE(link.link_kind, 'unmanaged') AS "link_kind!: String",
-            link.modrinth_project_id AS "modrinth_project_id?: String",
-            link.modrinth_version_id AS "modrinth_version_id?: String",
-            link.server_project_id AS "server_project_id?: String",
-            link.content_project_id AS "content_project_id?: String",
-            link.content_version_id AS "content_version_id?: String",
-            link.hosting_server_id AS "hosting_server_id?: String",
-            json(link.hosting_instance_ids) AS "hosting_instance_ids?: String",
-            link.hosting_active_instance_id AS "hosting_active_instance_id?: String",
-            link.shared_instance_id AS "shared_instance_id?: String",
-            link.imported_name AS "imported_name?: String",
-            link.imported_version_number AS "imported_version_number?: String",
-            link.imported_filename AS "imported_filename?: String",
-            COALESCE((
-                SELECT json_group_array(group_name)
-                FROM (
-                    SELECT group_name
-                    FROM instance_groups
-                    WHERE instance_id = i.id
-                    ORDER BY group_name
-                )
-            ), '[]') AS "groups!: String",
-            json(overrides.overrides) AS "launch_overrides?: String"
+        "#,
+        r#"
         FROM requested
         INNER JOIN instances i
             ON i.id = requested.id
-        LEFT JOIN instance_content_sets cs
-            ON cs.id = i.applied_content_set_id
-            AND cs.instance_id = i.id
-        LEFT JOIN instance_links link
-            ON link.instance_id = i.id
-        LEFT JOIN instance_launch_overrides overrides
-            ON overrides.instance_id = i.id
-        ORDER BY requested.ord
         "#,
+        "ORDER BY requested.ord",
         ids_json,
     )
     .fetch_all(pool)
@@ -580,69 +652,10 @@ pub(crate) async fn get_instance_metadata_many(
 pub(crate) async fn list_instance_metadata(
     pool: &SqlitePool,
 ) -> crate::Result<Vec<InstanceMetadataRecord>> {
-    let rows = sqlx::query_as!(
-        InstanceMetadataRow,
-        r#"
-        SELECT
-            i.id AS "id!: String",
-            i.path AS "path!: String",
-            i.applied_content_set_id AS "applied_content_set_id?: String",
-            i.install_stage AS "install_stage!: String",
-            i.launcher_feature_version AS "launcher_feature_version!: String",
-            i.update_channel AS "update_channel!: String",
-            i.name AS "name!: String",
-            i.icon_path AS "icon_path?: String",
-            i.created AS "created!: i64",
-            i.modified AS "modified!: i64",
-            i.last_played AS "last_played?: i64",
-            i.submitted_time_played AS "submitted_time_played!: i64",
-            i.recent_time_played AS "recent_time_played!: i64",
-            cs.id AS "content_set_id?: String",
-            cs.instance_id AS "content_set_instance_id?: String",
-            cs.name AS "content_set_name?: String",
-            cs.source_kind AS "content_set_source_kind?: String",
-            cs.status AS "content_set_status?: String",
-            cs.game_version AS "content_set_game_version?: String",
-            cs.protocol_version AS "content_set_protocol_version?: i64",
-            cs.loader AS "content_set_loader?: String",
-            cs.loader_version AS "content_set_loader_version?: String",
-            cs.created AS "content_set_created?: i64",
-            cs.modified AS "content_set_modified?: i64",
-            COALESCE(link.link_kind, 'unmanaged') AS "link_kind!: String",
-            link.modrinth_project_id AS "modrinth_project_id?: String",
-            link.modrinth_version_id AS "modrinth_version_id?: String",
-            link.server_project_id AS "server_project_id?: String",
-            link.content_project_id AS "content_project_id?: String",
-            link.content_version_id AS "content_version_id?: String",
-            link.hosting_server_id AS "hosting_server_id?: String",
-            json(link.hosting_instance_ids) AS "hosting_instance_ids?: String",
-            link.hosting_active_instance_id AS "hosting_active_instance_id?: String",
-            link.shared_instance_id AS "shared_instance_id?: String",
-            link.imported_name AS "imported_name?: String",
-            link.imported_version_number AS "imported_version_number?: String",
-            link.imported_filename AS "imported_filename?: String",
-            COALESCE((
-                SELECT json_group_array(group_name)
-                FROM (
-                    SELECT group_name
-                    FROM instance_groups
-                    WHERE instance_id = i.id
-                    ORDER BY group_name
-                )
-            ), '[]') AS "groups!: String",
-            json(overrides.overrides) AS "launch_overrides?: String"
-        FROM instances i
-        LEFT JOIN instance_content_sets cs
-            ON cs.id = i.applied_content_set_id
-            AND cs.instance_id = i.id
-        LEFT JOIN instance_links link
-            ON link.instance_id = i.id
-        LEFT JOIN instance_launch_overrides overrides
-            ON overrides.instance_id = i.id
-        "#,
-    )
-    .fetch_all(pool)
-    .await?;
+    let rows =
+        query_instance_metadata!("", "FROM instances i", "WHERE 1 = ?", 1_i64,)
+            .fetch_all(pool)
+            .await?;
 
     rows.into_iter()
         .map(InstanceMetadataRow::into_record)
@@ -653,59 +666,10 @@ pub(crate) async fn get_instance_launch_context(
     instance_id: &str,
     pool: &SqlitePool,
 ) -> crate::Result<Option<InstanceLaunchContext>> {
-    let row = sqlx::query_as!(
-        InstanceMetadataRow,
-        r#"
-        SELECT
-            i.id AS "id!: String",
-            i.path AS "path!: String",
-            i.applied_content_set_id AS "applied_content_set_id?: String",
-            i.install_stage AS "install_stage!: String",
-            i.launcher_feature_version AS "launcher_feature_version!: String",
-            i.update_channel AS "update_channel!: String",
-            i.name AS "name!: String",
-            i.icon_path AS "icon_path?: String",
-            i.created AS "created!: i64",
-            i.modified AS "modified!: i64",
-            i.last_played AS "last_played?: i64",
-            i.submitted_time_played AS "submitted_time_played!: i64",
-            i.recent_time_played AS "recent_time_played!: i64",
-            cs.id AS "content_set_id?: String",
-            cs.instance_id AS "content_set_instance_id?: String",
-            cs.name AS "content_set_name?: String",
-            cs.source_kind AS "content_set_source_kind?: String",
-            cs.status AS "content_set_status?: String",
-            cs.game_version AS "content_set_game_version?: String",
-            cs.protocol_version AS "content_set_protocol_version?: i64",
-            cs.loader AS "content_set_loader?: String",
-            cs.loader_version AS "content_set_loader_version?: String",
-            cs.created AS "content_set_created?: i64",
-            cs.modified AS "content_set_modified?: i64",
-            COALESCE(link.link_kind, 'unmanaged') AS "link_kind!: String",
-            link.modrinth_project_id AS "modrinth_project_id?: String",
-            link.modrinth_version_id AS "modrinth_version_id?: String",
-            link.server_project_id AS "server_project_id?: String",
-            link.content_project_id AS "content_project_id?: String",
-            link.content_version_id AS "content_version_id?: String",
-            link.hosting_server_id AS "hosting_server_id?: String",
-            json(link.hosting_instance_ids) AS "hosting_instance_ids?: String",
-            link.hosting_active_instance_id AS "hosting_active_instance_id?: String",
-            link.shared_instance_id AS "shared_instance_id?: String",
-            link.imported_name AS "imported_name?: String",
-            link.imported_version_number AS "imported_version_number?: String",
-            link.imported_filename AS "imported_filename?: String",
-            '[]' AS "groups!: String",
-            json(overrides.overrides) AS "launch_overrides?: String"
-        FROM instances i
-        LEFT JOIN instance_content_sets cs
-            ON cs.id = i.applied_content_set_id
-            AND cs.instance_id = i.id
-        LEFT JOIN instance_links link
-            ON link.instance_id = i.id
-        LEFT JOIN instance_launch_overrides overrides
-            ON overrides.instance_id = i.id
-        WHERE i.id = ?
-        "#,
+    let row = query_instance_metadata!(
+        "",
+        "FROM instances i",
+        "WHERE i.id = ?",
         instance_id,
     )
     .fetch_optional(pool)
@@ -753,6 +717,9 @@ where
             json(hosting_instance_ids) AS "hosting_instance_ids?: String",
             hosting_active_instance_id,
             shared_instance_id,
+            shared_instance_role,
+            shared_instance_manager_id,
+            shared_instance_linked_user_id,
             imported_name,
             imported_version_number,
             imported_filename
@@ -949,7 +916,6 @@ pub(crate) async fn upsert_instance_link(
     let hosting_instance_ids = columns.hosting_instance_ids.as_deref();
     let hosting_active_instance_id =
         columns.hosting_active_instance_id.as_deref();
-    let shared_instance_id = columns.shared_instance_id.as_deref();
     let imported_name = columns.imported_name.as_deref();
     let imported_version_number = columns.imported_version_number.as_deref();
     let imported_filename = columns.imported_filename.as_deref();
@@ -967,12 +933,11 @@ pub(crate) async fn upsert_instance_link(
 			hosting_server_id,
 			hosting_instance_ids,
 			hosting_active_instance_id,
-			shared_instance_id,
 			imported_name,
 			imported_version_number,
 			imported_filename
 		)
-		VALUES (?, ?, ?, ?, ?, ?, ?, ?, jsonb(?), ?, ?, ?, ?, ?)
+		VALUES (?, ?, ?, ?, ?, ?, ?, ?, jsonb(?), ?, ?, ?, ?)
 		ON CONFLICT (instance_id) DO UPDATE SET
 			link_kind = excluded.link_kind,
 			modrinth_project_id = excluded.modrinth_project_id,
@@ -983,7 +948,6 @@ pub(crate) async fn upsert_instance_link(
 			hosting_server_id = excluded.hosting_server_id,
 			hosting_instance_ids = excluded.hosting_instance_ids,
 			hosting_active_instance_id = excluded.hosting_active_instance_id,
-			shared_instance_id = excluded.shared_instance_id,
 			imported_name = excluded.imported_name,
 			imported_version_number = excluded.imported_version_number,
 			imported_filename = excluded.imported_filename
@@ -998,7 +962,6 @@ pub(crate) async fn upsert_instance_link(
         hosting_server_id,
         hosting_instance_ids,
         hosting_active_instance_id,
-        shared_instance_id,
         imported_name,
         imported_version_number,
         imported_filename,
@@ -1009,6 +972,64 @@ pub(crate) async fn upsert_instance_link(
     Ok(())
 }
 
+pub(crate) async fn set_shared_instance_attachment(
+    instance_id: &str,
+    attachment: Option<&SharedInstanceAttachment>,
+    tx: &mut Transaction<'_, Sqlite>,
+) -> crate::Result<()> {
+    let shared_instance_id = attachment.map(|value| value.id.to_string());
+    let shared_instance_role =
+        attachment.map(|value| value.role.as_str().to_string());
+    let shared_instance_manager_id =
+        attachment.and_then(|value| value.manager_id.as_deref());
+    let shared_instance_linked_user_id =
+        attachment.and_then(|value| value.linked_user_id.as_deref());
+    let shared_instance_server_manager_name =
+        attachment.and_then(|value| value.server_manager_name.as_deref());
+    let shared_instance_server_manager_icon_url =
+        attachment.and_then(|value| value.server_manager_icon_url.as_deref());
+
+    sqlx::query!(
+        "
+		INSERT INTO instance_links (
+			instance_id,
+			link_kind,
+			shared_instance_id,
+			shared_instance_role,
+			shared_instance_manager_id,
+			shared_instance_server_manager_name,
+			shared_instance_server_manager_icon_url,
+			shared_instance_linked_user_id
+		)
+		VALUES (?, 'unmanaged', ?, ?, ?, ?, ?, ?)
+		ON CONFLICT (instance_id) DO UPDATE SET
+			link_kind = CASE
+				WHEN excluded.shared_instance_id IS NULL
+					AND instance_links.link_kind = 'shared_instance'
+					THEN 'unmanaged'
+				ELSE instance_links.link_kind
+			END,
+			shared_instance_id = excluded.shared_instance_id,
+			shared_instance_role = excluded.shared_instance_role,
+			shared_instance_manager_id = excluded.shared_instance_manager_id,
+			shared_instance_server_manager_name = excluded.shared_instance_server_manager_name,
+			shared_instance_server_manager_icon_url = excluded.shared_instance_server_manager_icon_url,
+			shared_instance_linked_user_id = excluded.shared_instance_linked_user_id
+		",
+        instance_id,
+        shared_instance_id,
+        shared_instance_role,
+        shared_instance_manager_id,
+        shared_instance_server_manager_name,
+        shared_instance_server_manager_icon_url,
+        shared_instance_linked_user_id,
+    )
+    .execute(&mut **tx)
+    .await?;
+
+    Ok(())
+}
+
 pub(crate) async fn replace_instance_groups(
     instance_id: &str,
     groups: &[String],
@@ -1094,7 +1115,6 @@ struct InstanceLinkColumns {
     hosting_server_id: Option<String>,
     hosting_instance_ids: Option<String>,
     hosting_active_instance_id: Option<String>,
-    shared_instance_id: Option<String>,
     imported_name: Option<String>,
     imported_version_number: Option<String>,
     imported_filename: Option<String>,
@@ -1114,7 +1134,6 @@ fn instance_link_columns(
             hosting_server_id: None,
             hosting_instance_ids: None,
             hosting_active_instance_id: None,
-            shared_instance_id: None,
             imported_name: None,
             imported_version_number: None,
             imported_filename: None,
@@ -1132,7 +1151,6 @@ fn instance_link_columns(
             hosting_server_id: None,
             hosting_instance_ids: None,
             hosting_active_instance_id: None,
-            shared_instance_id: None,
             imported_name: None,
             imported_version_number: None,
             imported_filename: None,
@@ -1147,7 +1165,6 @@ fn instance_link_columns(
             hosting_server_id: None,
             hosting_instance_ids: None,
             hosting_active_instance_id: None,
-            shared_instance_id: None,
             imported_name: None,
             imported_version_number: None,
             imported_filename: None,
@@ -1166,7 +1183,6 @@ fn instance_link_columns(
             hosting_server_id: None,
             hosting_instance_ids: None,
             hosting_active_instance_id: None,
-            shared_instance_id: None,
             imported_name: None,
             imported_version_number: None,
             imported_filename: None,
@@ -1186,7 +1202,6 @@ fn instance_link_columns(
             hosting_instance_ids: Some(serde_json::to_string(instance_ids)?),
             hosting_active_instance_id: active_instance_id
                 .map(|value| value.to_string()),
-            shared_instance_id: None,
             imported_name: None,
             imported_version_number: None,
             imported_filename: None,
@@ -1207,28 +1222,27 @@ fn instance_link_columns(
             hosting_server_id: None,
             hosting_instance_ids: None,
             hosting_active_instance_id: None,
-            shared_instance_id: None,
             imported_name: name.clone(),
             imported_version_number: version_number.clone(),
             imported_filename: filename.clone(),
         }),
-        InstanceLink::SharedInstance { shared_instance_id } => {
-            Ok(InstanceLinkColumns {
-                link_kind: "shared_instance",
-                modrinth_project_id: None,
-                modrinth_version_id: None,
-                server_project_id: None,
-                content_project_id: None,
-                content_version_id: None,
-                hosting_server_id: None,
-                hosting_instance_ids: None,
-                hosting_active_instance_id: None,
-                shared_instance_id: Some(shared_instance_id.to_string()),
-                imported_name: None,
-                imported_version_number: None,
-                imported_filename: None,
-            })
-        }
+        InstanceLink::SharedInstance {
+            modpack_project_id,
+            modpack_version_id,
+        } => Ok(InstanceLinkColumns {
+            link_kind: "shared_instance",
+            modrinth_project_id: modpack_project_id.clone(),
+            modrinth_version_id: modpack_version_id.clone(),
+            server_project_id: None,
+            content_project_id: None,
+            content_version_id: None,
+            hosting_server_id: None,
+            hosting_instance_ids: None,
+            hosting_active_instance_id: None,
+            imported_name: None,
+            imported_version_number: None,
+            imported_filename: None,
+        }),
     }
 }
 
@@ -1273,6 +1287,60 @@ fn launch_overrides_from_json(
     }
 }
 
+fn shared_instance_attachment(
+    shared_instance_id: Option<String>,
+    shared_instance_role: Option<String>,
+    shared_instance_manager_id: Option<String>,
+    shared_instance_server_manager_name: Option<String>,
+    shared_instance_server_manager_icon_url: Option<String>,
+    shared_instance_linked_user_id: Option<String>,
+    shared_sync_status: Option<String>,
+    applied_update_id: Option<String>,
+    latest_available_update_id: Option<String>,
+) -> crate::Result<Option<SharedInstanceAttachment>> {
+    let Some(id) = shared_instance_id else {
+        return Ok(None);
+    };
+
+    let role = match shared_instance_role {
+        Some(role) => SharedInstanceRole::from_stored_str(&role)?,
+        None => SharedInstanceRole::Member,
+    };
+    let status = match shared_sync_status {
+        Some(status) => ContentSetSyncStatus::from_str(&status)?,
+        None => ContentSetSyncStatus::Unknown,
+    };
+
+    Ok(Some(SharedInstanceAttachment {
+        id,
+        role,
+        manager_id: shared_instance_manager_id,
+        server_manager_name: shared_instance_server_manager_name,
+        server_manager_icon_url: shared_instance_server_manager_icon_url,
+        linked_user_id: shared_instance_linked_user_id,
+        status,
+        applied_version: optional_i32(applied_update_id, "applied_update_id")?,
+        latest_version: optional_i32(
+            latest_available_update_id,
+            "latest_available_update_id",
+        )?,
+    }))
+}
+
+fn optional_i32(
+    value: Option<String>,
+    column: &str,
+) -> crate::Result<Option<i32>> {
+    value
+        .map(|value| {
+            value.parse().map_err(|err| {
+                crate::ErrorKind::InputError(format!("Invalid {column}: {err}"))
+                    .into()
+            })
+        })
+        .transpose()
+}
+
 fn parse_uuid(value: Option<String>, column: &str) -> crate::Result<Uuid> {
     let value = required(value, column)?;
 
diff --git a/packages/app-lib/src/state/instances/commands/apply_content_install.rs b/packages/app-lib/src/state/instances/commands/apply_content_install.rs
index 49536fb69..c3e036d53 100644
--- a/packages/app-lib/src/state/instances/commands/apply_content_install.rs
+++ b/packages/app-lib/src/state/instances/commands/apply_content_install.rs
@@ -502,6 +502,13 @@ pub(crate) async fn add_project_bytes(
     version_id: Option<&str>,
     state: &State,
 ) -> crate::Result<String> {
+    if !path_util::is_safe_file_name(file_name) {
+        return Err(crate::ErrorKind::InputError(format!(
+            "Project file {file_name} has an invalid file name"
+        ))
+        .into());
+    }
+
     let _content_lock = state.lock_instance_content(instance_id).await;
     let scope = resolve_content_scope(instance_id, None, state).await?;
     let project_type = match project_type {
@@ -561,6 +568,7 @@ pub(crate) async fn add_project_bytes(
     )
     .await?;
     tx.commit().await?;
+    super::mark_shared_instance_stale(instance_id, &state.pool).await?;
 
     Ok(relative_path)
 }
@@ -608,6 +616,7 @@ pub(crate) async fn record_project_file(
     )
     .await?;
     tx.commit().await?;
+    super::mark_shared_instance_stale(instance_id, &state.pool).await?;
 
     Ok(())
 }
@@ -711,6 +720,8 @@ pub(crate) async fn toggle_disable_project(
     }
     tx.commit().await?;
 
+    super::mark_shared_instance_stale(instance_id, &state.pool).await?;
+
     Ok(new_path)
 }
 
@@ -752,9 +763,36 @@ pub(crate) async fn remove_project(
         tx.commit().await?;
     }
 
+    super::mark_shared_instance_stale(instance_id, &state.pool).await?;
+
     Ok(())
 }
 
+pub(crate) async fn content_source_kind_for_project_path(
+    instance_id: &str,
+    project_path: &str,
+    state: &State,
+) -> crate::Result<Option<ContentSourceKind>> {
+    let scope = resolve_content_scope(instance_id, None, state).await?;
+    let Some(file) = content_rows::get_instance_file_by_relative_path(
+        &scope.instance.id,
+        project_path,
+        &state.pool,
+    )
+    .await?
+    else {
+        return Ok(None);
+    };
+    let entries =
+        content_rows::get_content_entries(&scope.content_set_id, &state.pool)
+            .await?;
+
+    Ok(entries.into_iter().find_map(|entry| {
+        (entry.file_id.as_deref() == Some(file.id.as_str()))
+            .then_some(entry.source_kind)
+    }))
+}
+
 pub(crate) async fn rename_project_companion_file(
     instance_id: &str,
     old_project_path: &str,
diff --git a/packages/app-lib/src/state/instances/commands/apply_content_update.rs b/packages/app-lib/src/state/instances/commands/apply_content_update.rs
index 09aa35892..232e36130 100644
--- a/packages/app-lib/src/state/instances/commands/apply_content_update.rs
+++ b/packages/app-lib/src/state/instances/commands/apply_content_update.rs
@@ -52,6 +52,7 @@ struct InstalledProject {
     relative_path: String,
     project_id: Option<String>,
     version_id: Option<String>,
+    source_kind: ContentSourceKind,
     enabled: bool,
 }
 
@@ -295,8 +296,14 @@ async fn plan_bulk_update(
     instance_id: &str,
     state: &State,
 ) -> crate::Result<BulkUpdatePlan> {
-    let updateable_paths =
-        bulk_updateable_project_paths(instance_id, state).await?;
+    let shared_instance_member =
+        is_shared_instance_member(instance_id, state).await?;
+    let updateable_paths = bulk_updateable_project_paths(
+        instance_id,
+        shared_instance_member,
+        state,
+    )
+    .await?;
     if updateable_paths.is_empty() {
         return Ok(BulkUpdatePlan {
             project_updates: Vec::new(),
@@ -330,6 +337,30 @@ async fn plan_bulk_update(
             })?;
     let installed =
         installed_projects(instance_id, &content_set, state).await?;
+    let updateable_paths = if shared_instance_member {
+        let managed_paths = installed
+            .iter()
+            .filter(|project| project.source_kind.is_shared_instance_managed())
+            .map(|project| project.relative_path.clone())
+            .collect::<HashSet<_>>();
+
+        updateable_paths
+            .into_iter()
+            .filter(|path| !managed_paths.contains(path))
+            .collect::<HashSet<_>>()
+    } else {
+        updateable_paths
+    };
+    let updates = updates
+        .into_iter()
+        .filter(|update| updateable_paths.contains(&update.relative_path))
+        .collect::<Vec<_>>();
+    if updates.is_empty() {
+        return Ok(BulkUpdatePlan {
+            project_updates: Vec::new(),
+            dependency_additions: Vec::new(),
+        });
+    }
     let installed_by_project = installed
         .iter()
         .filter_map(|project| {
@@ -416,6 +447,7 @@ async fn plan_bulk_update(
 
 async fn bulk_updateable_project_paths(
     instance_id: &str,
+    shared_instance_member: bool,
     state: &State,
 ) -> crate::Result<HashSet<String>> {
     let items = super::list_content::list_content(
@@ -426,7 +458,16 @@ async fn bulk_updateable_project_paths(
     )
     .await?;
 
-    Ok(items.into_iter().map(|item| item.file_path).collect())
+    Ok(items
+        .into_iter()
+        .filter(|item| {
+            !shared_instance_member
+                || !item
+                    .source_kind
+                    .is_some_and(ContentSourceKind::is_shared_instance_managed)
+        })
+        .map(|item| item.file_path)
+        .collect())
 }
 
 async fn installed_projects(
@@ -471,10 +512,27 @@ fn installed_project_from_row(
         relative_path: file.relative_path.clone(),
         project_id: entry.project_id.clone(),
         version_id: entry.version_id.clone(),
+        source_kind: entry.source_kind,
         enabled: entry.enabled && file.enabled,
     })
 }
 
+async fn is_shared_instance_member(
+    instance_id: &str,
+    state: &State,
+) -> crate::Result<bool> {
+    let Some(metadata) =
+        instance_rows::get_instance_metadata_by_id(instance_id, &state.pool)
+            .await?
+    else {
+        return Ok(false);
+    };
+
+    Ok(metadata
+        .shared_instance
+        .is_some_and(|attachment| attachment.role.is_member()))
+}
+
 async fn dependency_closure(
     root_versions: Vec<Version>,
     content_set: &ContentSet,
diff --git a/packages/app-lib/src/state/instances/commands/edit_instance.rs b/packages/app-lib/src/state/instances/commands/edit_instance.rs
index f57eb70d4..11a8b6ec6 100644
--- a/packages/app-lib/src/state/instances/commands/edit_instance.rs
+++ b/packages/app-lib/src/state/instances/commands/edit_instance.rs
@@ -102,11 +102,28 @@ pub(crate) async fn edit_instance(
     patch: EditInstance,
     pool: &SqlitePool,
 ) -> crate::Result<Instance> {
+    let modifies_content =
+        patch.link.is_some() || patch.content_set_patch.is_some();
+    let should_mark_shared_instance_stale = patch.link.is_some()
+        || patch.content_set_patch.as_ref().is_some_and(|patch| {
+            patch.source_kind.is_some()
+                || patch.game_version.is_some()
+                || patch.loader.is_some()
+                || patch.loader_version.is_some()
+        });
     let mut instance = instance_rows::get_instance_by_id(instance_id, pool)
         .await?
         .ok_or_else(|| {
             crate::ErrorKind::InputError("Unknown instance".to_string())
         })?;
+    if modifies_content
+        && instance_rows::is_instance_quarantined(instance_id, pool).await?
+    {
+        return Err(crate::ErrorKind::InputError(
+            "Content in quarantined instances cannot be changed.".to_string(),
+        )
+        .into());
+    }
     let now = Utc::now();
 
     apply_instance_patch(&mut instance, &patch, now);
@@ -169,6 +186,10 @@ pub(crate) async fn edit_instance(
 
     tx.commit().await?;
 
+    if should_mark_shared_instance_stale {
+        super::mark_shared_instance_stale(instance_id, pool).await?;
+    }
+
     Ok(instance)
 }
 
diff --git a/packages/app-lib/src/state/instances/commands/get_instance.rs b/packages/app-lib/src/state/instances/commands/get_instance.rs
index 87be04dfe..b404290d8 100644
--- a/packages/app-lib/src/state/instances/commands/get_instance.rs
+++ b/packages/app-lib/src/state/instances/commands/get_instance.rs
@@ -1,6 +1,6 @@
 use crate::state::instances::{
     ContentSet, Instance, InstanceLaunchOverrides, InstanceLink,
-    adapters::sqlite::instance_rows,
+    SharedInstanceAttachment, adapters::sqlite::instance_rows,
 };
 use serde::{Deserialize, Serialize};
 use sqlx::SqlitePool;
@@ -10,6 +10,9 @@ pub struct InstanceMetadata {
     pub instance: Instance,
     pub applied_content_set: ContentSet,
     pub link: InstanceLink,
+    pub shared_instance: Option<SharedInstanceAttachment>,
+    #[serde(default)]
+    pub quarantined: bool,
     pub groups: Vec<String>,
     pub launch_overrides: InstanceLaunchOverrides,
 }
@@ -25,44 +28,62 @@ pub(crate) async fn get_instance_metadata(
     instance_id: &str,
     pool: &SqlitePool,
 ) -> crate::Result<Option<InstanceMetadata>> {
-    Ok(
-        instance_rows::get_instance_metadata_by_id(instance_id, pool)
-            .await?
-            .map(Into::into),
-    )
+    let Some(record) =
+        instance_rows::get_instance_metadata_by_id(instance_id, pool).await?
+    else {
+        return Ok(None);
+    };
+    let quarantined =
+        instance_rows::is_instance_quarantined(instance_id, pool).await?;
+
+    Ok(Some(instance_metadata(record, quarantined)))
 }
 
 pub(crate) async fn get_instances_metadata(
     instance_ids: &[&str],
     pool: &SqlitePool,
 ) -> crate::Result<Vec<InstanceMetadata>> {
-    Ok(
-        instance_rows::get_instance_metadata_many(instance_ids, pool)
-            .await?
-            .into_iter()
-            .map(Into::into)
-            .collect(),
-    )
+    let records =
+        instance_rows::get_instance_metadata_many(instance_ids, pool).await?;
+    let quarantined_ids =
+        instance_rows::get_quarantined_instance_ids(pool).await?;
+
+    Ok(records
+        .into_iter()
+        .map(|record| {
+            let quarantined = quarantined_ids.contains(&record.instance.id);
+            instance_metadata(record, quarantined)
+        })
+        .collect())
 }
 
 pub(crate) async fn list_instances(
     pool: &SqlitePool,
 ) -> crate::Result<Vec<InstanceMetadata>> {
-    Ok(instance_rows::list_instance_metadata(pool)
-        .await?
+    let records = instance_rows::list_instance_metadata(pool).await?;
+    let quarantined_ids =
+        instance_rows::get_quarantined_instance_ids(pool).await?;
+
+    Ok(records
         .into_iter()
-        .map(Into::into)
+        .map(|record| {
+            let quarantined = quarantined_ids.contains(&record.instance.id);
+            instance_metadata(record, quarantined)
+        })
         .collect())
 }
 
-impl From<instance_rows::InstanceMetadataRecord> for InstanceMetadata {
-    fn from(record: instance_rows::InstanceMetadataRecord) -> Self {
-        Self {
-            instance: record.instance,
-            applied_content_set: record.applied_content_set,
-            link: record.link,
-            groups: record.groups,
-            launch_overrides: record.launch_overrides,
-        }
+fn instance_metadata(
+    record: instance_rows::InstanceMetadataRecord,
+    quarantined: bool,
+) -> InstanceMetadata {
+    InstanceMetadata {
+        instance: record.instance,
+        applied_content_set: record.applied_content_set,
+        link: record.link,
+        shared_instance: record.shared_instance,
+        quarantined,
+        groups: record.groups,
+        launch_overrides: record.launch_overrides,
     }
 }
diff --git a/packages/app-lib/src/state/instances/commands/list_content.rs b/packages/app-lib/src/state/instances/commands/list_content.rs
index 4272f2990..69c2d8646 100644
--- a/packages/app-lib/src/state/instances/commands/list_content.rs
+++ b/packages/app-lib/src/state/instances/commands/list_content.rs
@@ -528,6 +528,7 @@ pub(crate) async fn dependencies_to_content_items(
                 has_update: false,
                 update_version_id: None,
                 date_added: None,
+                source_kind: None,
             })
         })
         .collect::<Vec<_>>();
@@ -738,6 +739,7 @@ async fn content_projects_for_scope(
                 size: file.size,
                 metadata: file_metadata_from_entry_or_cache(entry, metadata),
                 project_type,
+                source_kind: entry.map(|entry| entry.source_kind),
             },
         );
     }
@@ -897,9 +899,13 @@ async fn content_files_to_content_items(
                     date_published: Some(version.date_published.to_rfc3339()),
                 }),
                 owner,
-                has_update: file.update_version_id.is_some(),
+                has_update: file.update_version_id.is_some()
+                    && !file.source_kind.is_some_and(
+                        ContentSourceKind::is_shared_instance_managed,
+                    ),
                 update_version_id: file.update_version_id.clone(),
                 date_added: modification_times[index].clone(),
+                source_kind: file.source_kind,
             }
         })
         .collect::<Vec<_>>();
@@ -1089,6 +1095,10 @@ fn linked_modpack_ids(link: &InstanceLink) -> Option<(String, String)> {
             version_id: Some(version_id),
             ..
         } => Some((project_id.clone(), version_id.clone())),
+        InstanceLink::SharedInstance {
+            modpack_project_id: Some(project_id),
+            modpack_version_id: Some(version_id),
+        } => Some((project_id.clone(), version_id.clone())),
         _ => None,
     }
 }
@@ -1103,6 +1113,10 @@ fn linked_modpack_source_kind(
         InstanceLink::ServerProjectModpack { .. } => {
             Some(ContentSourceKind::ServerProject)
         }
+        InstanceLink::SharedInstance {
+            modpack_project_id: Some(_),
+            modpack_version_id: Some(_),
+        } => Some(ContentSourceKind::ModrinthModpack),
         _ => None,
     }
 }
@@ -1348,12 +1362,7 @@ async fn get_modpack_identifiers(
 }
 
 fn project_type_from_api_name(project_type: &str) -> ProjectType {
-    match project_type {
-        "resourcepack" => ProjectType::ResourcePack,
-        "shader" => ProjectType::ShaderPack,
-        "datapack" => ProjectType::DataPack,
-        _ => ProjectType::Mod,
-    }
+    ProjectType::from_name(project_type).unwrap_or(ProjectType::Mod)
 }
 
 fn sort_content_items(items: &mut [ContentItem]) {
diff --git a/packages/app-lib/src/state/instances/commands/mod.rs b/packages/app-lib/src/state/instances/commands/mod.rs
index bba272e0b..ff79b14d2 100644
--- a/packages/app-lib/src/state/instances/commands/mod.rs
+++ b/packages/app-lib/src/state/instances/commands/mod.rs
@@ -41,3 +41,9 @@ mod check_content_updates;
 
 mod apply_content_update;
 pub(crate) use self::apply_content_update::*;
+
+mod shared_instance;
+pub(crate) use self::shared_instance::{
+    attach_shared_instance, clear_shared_instance, mark_shared_instance_stale,
+    quarantine_shared_instance, set_shared_instance_sync_status,
+};
diff --git a/packages/app-lib/src/state/instances/commands/shared_instance.rs b/packages/app-lib/src/state/instances/commands/shared_instance.rs
new file mode 100644
index 000000000..d619b68f8
--- /dev/null
+++ b/packages/app-lib/src/state/instances/commands/shared_instance.rs
@@ -0,0 +1,184 @@
+use crate::state::instances::adapters::sqlite::{content_rows, instance_rows};
+use crate::state::instances::{
+    ContentSetRemoteRef, ContentSetRemoteRefType, ContentSetSyncProvider,
+    ContentSetSyncState, ContentSetSyncStatus, InstanceLink,
+    SharedInstanceAttachment, SharedInstanceAttachmentInput,
+    SharedInstanceRole,
+};
+use chrono::Utc;
+use sqlx::SqlitePool;
+
+pub(crate) async fn attach_shared_instance(
+    instance_id: &str,
+    input: SharedInstanceAttachmentInput,
+    pool: &SqlitePool,
+) -> crate::Result<()> {
+    let metadata =
+        instance_rows::get_instance_metadata_by_id(instance_id, pool)
+            .await?
+            .ok_or_else(|| {
+                crate::ErrorKind::InputError("Unknown instance".to_string())
+            })?;
+    let content_set_id = metadata.applied_content_set.id;
+    let attachment = SharedInstanceAttachment::from(input);
+    let sync_state =
+        shared_sync_state(&content_set_id, &attachment, Some(Utc::now()));
+
+    let mut tx = pool.begin().await?;
+    instance_rows::set_shared_instance_attachment(
+        instance_id,
+        Some(&attachment),
+        &mut tx,
+    )
+    .await?;
+    content_rows::upsert_content_set_remote_ref(
+        &ContentSetRemoteRef {
+            content_set_id: content_set_id.clone(),
+            ref_type: ContentSetRemoteRefType::SharedContentSet,
+            ref_id: attachment.id.clone(),
+        },
+        &mut tx,
+    )
+    .await?;
+    content_rows::upsert_content_set_sync_state(&sync_state, &mut tx).await?;
+    tx.commit().await?;
+
+    Ok(())
+}
+
+pub(crate) async fn clear_shared_instance(
+    instance_id: &str,
+    pool: &SqlitePool,
+) -> crate::Result<()> {
+    detach_shared_instance(instance_id, false, pool).await
+}
+
+pub(crate) async fn quarantine_shared_instance(
+    instance_id: &str,
+    pool: &SqlitePool,
+) -> crate::Result<()> {
+    detach_shared_instance(instance_id, true, pool).await
+}
+
+async fn detach_shared_instance(
+    instance_id: &str,
+    quarantine: bool,
+    pool: &SqlitePool,
+) -> crate::Result<()> {
+    let Some(metadata) =
+        instance_rows::get_instance_metadata_by_id(instance_id, pool).await?
+    else {
+        return Ok(());
+    };
+    let content_set_id = metadata.applied_content_set.id;
+    let retained_modpack_link = match metadata.link {
+        InstanceLink::SharedInstance {
+            modpack_project_id: Some(project_id),
+            modpack_version_id: Some(version_id),
+        } => Some(InstanceLink::ModrinthModpack {
+            project_id,
+            version_id,
+        }),
+        _ => None,
+    };
+
+    let mut tx = pool.begin().await?;
+    instance_rows::set_shared_instance_attachment(instance_id, None, &mut tx)
+        .await?;
+    if quarantine {
+        instance_rows::set_instance_quarantined(instance_id, true, &mut tx)
+            .await?;
+    }
+    if let Some(link) = retained_modpack_link.as_ref() {
+        instance_rows::upsert_instance_link(instance_id, link, &mut tx).await?;
+    }
+    content_rows::delete_content_set_remote_ref(
+        &content_set_id,
+        ContentSetRemoteRefType::SharedContentSet,
+        &mut tx,
+    )
+    .await?;
+    content_rows::delete_content_set_sync_state(&content_set_id, &mut tx)
+        .await?;
+    tx.commit().await?;
+
+    Ok(())
+}
+
+pub(crate) async fn set_shared_instance_sync_status(
+    instance_id: &str,
+    status: ContentSetSyncStatus,
+    applied_version: Option<i32>,
+    latest_version: Option<i32>,
+    pool: &SqlitePool,
+) -> crate::Result<()> {
+    let metadata =
+        instance_rows::get_instance_metadata_by_id(instance_id, pool)
+            .await?
+            .ok_or_else(|| {
+                crate::ErrorKind::InputError("Unknown instance".to_string())
+            })?;
+    let Some(mut attachment) = metadata.shared_instance else {
+        return Ok(());
+    };
+
+    attachment.status = status;
+    attachment.applied_version = applied_version;
+    attachment.latest_version = latest_version;
+
+    let sync_state = shared_sync_state(
+        &metadata.applied_content_set.id,
+        &attachment,
+        Some(Utc::now()),
+    );
+    let mut tx = pool.begin().await?;
+    content_rows::upsert_content_set_sync_state(&sync_state, &mut tx).await?;
+    tx.commit().await?;
+
+    Ok(())
+}
+
+pub(crate) async fn mark_shared_instance_stale(
+    instance_id: &str,
+    pool: &SqlitePool,
+) -> crate::Result<()> {
+    let Some(metadata) =
+        instance_rows::get_instance_metadata_by_id(instance_id, pool).await?
+    else {
+        return Ok(());
+    };
+    let Some(attachment) = metadata.shared_instance else {
+        return Ok(());
+    };
+    if attachment.role != SharedInstanceRole::Owner {
+        return Ok(());
+    }
+
+    set_shared_instance_sync_status(
+        instance_id,
+        ContentSetSyncStatus::Stale,
+        attachment.applied_version,
+        attachment.latest_version,
+        pool,
+    )
+    .await
+}
+
+fn shared_sync_state(
+    content_set_id: &str,
+    attachment: &SharedInstanceAttachment,
+    checked_at: Option<chrono::DateTime<Utc>>,
+) -> ContentSetSyncState {
+    ContentSetSyncState {
+        content_set_id: content_set_id.to_string(),
+        provider: ContentSetSyncProvider::SharedInstance,
+        applied_update_id: attachment
+            .applied_version
+            .map(|value| value.to_string()),
+        latest_available_update_id: attachment
+            .latest_version
+            .map(|value| value.to_string()),
+        checked_at,
+        status: attachment.status,
+    }
+}
diff --git a/packages/app-lib/src/state/instances/commands/sync_content_files.rs b/packages/app-lib/src/state/instances/commands/sync_content_files.rs
index 79af5ab59..a3b6ae915 100644
--- a/packages/app-lib/src/state/instances/commands/sync_content_files.rs
+++ b/packages/app-lib/src/state/instances/commands/sync_content_files.rs
@@ -75,6 +75,7 @@ pub(crate) async fn sync_instance_content_files(
     let now = Utc::now();
     let mut files = Vec::new();
     let mut present_without_hash_ids = Vec::new();
+    let mut restored_without_hash = false;
 
     for file in scanned {
         let hash_key = file.hash_cache_key.trim_end_matches(".disabled");
@@ -82,6 +83,7 @@ pub(crate) async fn sync_instance_content_files(
         let Some(hash) = hashes_by_key.get(hash_key) else {
             if let Some(existing_file) = existing_file {
                 present_without_hash_ids.push(existing_file.id.clone());
+                restored_without_hash |= existing_file.missing;
             }
             continue;
         };
@@ -102,6 +104,19 @@ pub(crate) async fn sync_instance_content_files(
         });
     }
 
+    let content_changed = !missing_file_ids.is_empty()
+        || restored_without_hash
+        || files.iter().any(|file| {
+            existing_files_by_path.get(&file.relative_path).is_none_or(
+                |existing| {
+                    existing.missing
+                        || existing.enabled != file.enabled
+                        || existing.sha1 != file.sha1
+                        || existing.size != file.size
+                },
+            )
+        });
+
     let mut tx = state.pool.begin().await?;
     for file_id in missing_file_ids {
         sqlite::content_rows::set_instance_file_missing(
@@ -129,6 +144,10 @@ pub(crate) async fn sync_instance_content_files(
 
     tx.commit().await?;
 
+    if content_changed {
+        super::mark_shared_instance_stale(&instance.id, &state.pool).await?;
+    }
+
     Ok(stored_files)
 }
 
diff --git a/packages/app-lib/src/state/instances/content.rs b/packages/app-lib/src/state/instances/content.rs
index 507d92092..6a0838ab6 100644
--- a/packages/app-lib/src/state/instances/content.rs
+++ b/packages/app-lib/src/state/instances/content.rs
@@ -1,3 +1,4 @@
+use super::ContentSourceKind;
 use crate::state::{Project, ProjectType, Version};
 use serde::{Deserialize, Serialize};
 
@@ -15,6 +16,7 @@ pub struct ContentItem {
     pub has_update: bool,
     pub update_version_id: Option<String>,
     pub date_added: Option<String>,
+    pub source_kind: Option<ContentSourceKind>,
 }
 
 #[derive(Debug, Serialize, Deserialize, Clone)]
diff --git a/packages/app-lib/src/state/instances/mod.rs b/packages/app-lib/src/state/instances/mod.rs
index 9426b01d5..4a9195c1f 100644
--- a/packages/app-lib/src/state/instances/mod.rs
+++ b/packages/app-lib/src/state/instances/mod.rs
@@ -10,6 +10,10 @@ pub use self::commands::{
     AppliedContentSetPatch, CreateInstance, EditInstance,
     InstanceLaunchOverridesPatch, InstanceMetadata,
 };
+pub(crate) use self::commands::{
+    attach_shared_instance, clear_shared_instance, mark_shared_instance_stale,
+    quarantine_shared_instance, set_shared_instance_sync_status,
+};
 pub(crate) use self::commands::{
     create_instance, edit_instance, get_instance, get_instances_metadata,
     list_instances, refresh_all_instances, remove_instance,
diff --git a/packages/app-lib/src/state/instances/model/content_set.rs b/packages/app-lib/src/state/instances/model/content_set.rs
index 7fb62ea09..24e6f826d 100644
--- a/packages/app-lib/src/state/instances/model/content_set.rs
+++ b/packages/app-lib/src/state/instances/model/content_set.rs
@@ -16,6 +16,15 @@ pub enum ContentSourceKind {
 }
 
 impl ContentSourceKind {
+    pub fn is_shared_instance_managed(self) -> bool {
+        matches!(
+            self,
+            Self::SharedInstance
+                | Self::ModrinthModpack
+                | Self::ImportedModpack
+        )
+    }
+
     pub fn as_str(self) -> &'static str {
         match self {
             Self::Local => "local",
diff --git a/packages/app-lib/src/state/instances/model/link.rs b/packages/app-lib/src/state/instances/model/link.rs
index e85ed0860..0ae8e26e2 100644
--- a/packages/app-lib/src/state/instances/model/link.rs
+++ b/packages/app-lib/src/state/instances/model/link.rs
@@ -1,6 +1,8 @@
 use serde::{Deserialize, Serialize};
 use uuid::Uuid;
 
+use super::ContentSetSyncStatus;
+
 #[derive(Clone, Debug, Serialize, Deserialize)]
 #[serde(rename_all = "snake_case")]
 pub enum InstanceLink {
@@ -32,7 +34,85 @@ pub enum InstanceLink {
         version_number: Option<String>,
         filename: Option<String>,
     },
+    /// Modpack provenance installed by a shared instance. Remote membership,
+    /// manager identity, and synchronization state belong to
+    /// [`SharedInstanceAttachment`].
     SharedInstance {
-        shared_instance_id: Uuid,
+        modpack_project_id: Option<String>,
+        modpack_version_id: Option<String>,
     },
 }
+
+#[derive(Clone, Copy, Debug, Eq, PartialEq, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub enum SharedInstanceRole {
+    Owner,
+    Member,
+}
+
+impl SharedInstanceRole {
+    pub fn is_member(self) -> bool {
+        self == Self::Member
+    }
+
+    pub fn as_str(self) -> &'static str {
+        match self {
+            Self::Owner => "owner",
+            Self::Member => "member",
+        }
+    }
+
+    pub fn from_stored_str(value: &str) -> crate::Result<Self> {
+        match value {
+            "owner" => Ok(Self::Owner),
+            "member" => Ok(Self::Member),
+            other => Err(super::unknown_value("shared instance role", other)),
+        }
+    }
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+/// The remote shared-instance relationship for a local instance. This is
+/// independent from the optional modpack provenance stored in [`InstanceLink`].
+pub struct SharedInstanceAttachment {
+    pub id: String,
+    pub role: SharedInstanceRole,
+    pub manager_id: Option<String>,
+    #[serde(default)]
+    pub server_manager_name: Option<String>,
+    #[serde(default)]
+    pub server_manager_icon_url: Option<String>,
+    pub linked_user_id: Option<String>,
+    pub status: ContentSetSyncStatus,
+    pub applied_version: Option<i32>,
+    pub latest_version: Option<i32>,
+}
+
+#[derive(Clone, Debug)]
+pub(crate) struct SharedInstanceAttachmentInput {
+    pub id: String,
+    pub role: SharedInstanceRole,
+    pub manager_id: Option<String>,
+    pub server_manager_name: Option<String>,
+    pub server_manager_icon_url: Option<String>,
+    pub linked_user_id: Option<String>,
+    pub status: ContentSetSyncStatus,
+    pub applied_version: Option<i32>,
+    pub latest_version: Option<i32>,
+}
+
+impl From<SharedInstanceAttachmentInput> for SharedInstanceAttachment {
+    fn from(input: SharedInstanceAttachmentInput) -> Self {
+        Self {
+            id: input.id,
+            role: input.role,
+            manager_id: input.manager_id,
+            server_manager_name: input.server_manager_name,
+            server_manager_icon_url: input.server_manager_icon_url,
+            linked_user_id: input.linked_user_id,
+            status: input.status,
+            applied_version: input.applied_version,
+            latest_version: input.latest_version,
+        }
+    }
+}
diff --git a/packages/app-lib/src/state/instances/watcher.rs b/packages/app-lib/src/state/instances/watcher.rs
index 08647a5dc..b7e6dd86c 100644
--- a/packages/app-lib/src/state/instances/watcher.rs
+++ b/packages/app-lib/src/state/instances/watcher.rs
@@ -1,4 +1,5 @@
 use crate::State;
+use crate::api::instance::CONFIG_DIRECTORY;
 use crate::event::InstancePayloadType;
 use crate::event::emit::{emit_instance, emit_warning};
 use crate::state::{
@@ -128,17 +129,41 @@ pub async fn init_watcher() -> crate::Result<FileWatcher> {
                                     Some(InstancePayloadType::WorldUpdated {
                                         world,
                                     })
-                                } else if first_file_name
-                                    .as_ref()
-                                    .is_none_or(|x| *x != "saves")
-                                {
+                                } else if first_file_name.as_ref().is_none_or(
+                                    |x| *x != "saves" && *x != CONFIG_DIRECTORY,
+                                ) {
                                     Some(InstancePayloadType::Synced)
                                 } else {
                                     None
                                 };
                                 if let Some(event) = event {
                                     let emit_instance_id = instance_id.clone();
+                                    let mark_shared_stale = first_file_name
+                                        .as_ref()
+                                        .is_some_and(|name| {
+                                            ProjectType::iterator().any(
+                                                |project_type| {
+                                                    *name
+                                                        == project_type
+                                                            .get_folder()
+                                                },
+                                            )
+                                        });
                                     tokio::spawn(async move {
+                                        if mark_shared_stale
+                                            && let Ok(state) =
+                                                State::get().await
+                                            && let Err(error) =
+                                                crate::state::mark_shared_instance_stale(
+                                                    &emit_instance_id,
+                                                    &state.pool,
+                                                )
+                                                .await
+                                        {
+                                            tracing::error!(
+                                                "Failed to mark shared instance stale after filesystem sync: {error}"
+                                            );
+                                        }
                                         let _ = emit_instance(
                                             &emit_instance_id,
                                             event,
@@ -194,10 +219,11 @@ pub(crate) async fn watch_instance_folder(
     }
 
     let mut to_watch = Vec::new();
-    for sub_path in ProjectType::iterator()
-        .map(|x| x.get_folder())
-        .chain(["crash-reports", "saves"])
-    {
+    for sub_path in ProjectType::iterator().map(|x| x.get_folder()).chain([
+        "crash-reports",
+        "saves",
+        CONFIG_DIRECTORY,
+    ]) {
         let full_path = full_instance_path.join(sub_path);
 
         let meta = tokio::fs::symlink_metadata(&full_path).await;
diff --git a/packages/app-lib/src/state/mr_auth.rs b/packages/app-lib/src/state/mr_auth.rs
index 09b735ea5..54276bf56 100644
--- a/packages/app-lib/src/state/mr_auth.rs
+++ b/packages/app-lib/src/state/mr_auth.rs
@@ -195,6 +195,10 @@ pub const fn get_login_url() -> &'static str {
     concat!(env!("MODRINTH_URL"), "auth/sign-in")
 }
 
+pub const fn get_signup_url() -> &'static str {
+    concat!(env!("MODRINTH_URL"), "auth/sign-up")
+}
+
 pub async fn finish_login_flow(
     code: &str,
     semaphore: &FetchSemaphore,
diff --git a/packages/app-lib/src/util/fetch.rs b/packages/app-lib/src/util/fetch.rs
index 0662a3d5c..fbca82414 100644
--- a/packages/app-lib/src/util/fetch.rs
+++ b/packages/app-lib/src/util/fetch.rs
@@ -915,13 +915,10 @@ pub async fn write_cached_icon(
     bytes: Bytes,
     semaphore: &IoSemaphore,
 ) -> crate::Result<PathBuf> {
-    let extension = Path::new(&icon_path).extension().and_then(OsStr::to_str);
     let hash = sha1_async(bytes.clone()).await?;
-    let path = cache_dir.join("icons").join(if let Some(ext) = extension {
-        format!("{hash}.{ext}")
-    } else {
-        hash
-    });
+    let path = cache_dir
+        .join("icons")
+        .join(cached_icon_file_name(icon_path, &hash));
 
     write(&path, &bytes, semaphore).await?;
 
@@ -929,6 +926,14 @@ pub async fn write_cached_icon(
     Ok(path)
 }
 
+fn cached_icon_file_name(icon_path: &str, hash: &str) -> String {
+    let path = icon_path.split(['?', '#']).next().unwrap_or(icon_path);
+    match Path::new(path).extension().and_then(OsStr::to_str) {
+        Some(extension) => format!("{hash}.{extension}"),
+        None => hash.to_string(),
+    }
+}
+
 pub async fn sha1_async(bytes: Bytes) -> crate::Result<String> {
     let hash = tokio::task::spawn_blocking(move || {
         sha1_smol::Sha1::from(bytes).hexdigest()
diff --git a/packages/assets/branding/illustrations/invite-bg.webp b/packages/assets/branding/illustrations/invite-bg.webp
new file mode 100644
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HcmV?d00001

diff --git a/packages/assets/generated-icons.ts b/packages/assets/generated-icons.ts
index 4b499d822..f64502021 100644
--- a/packages/assets/generated-icons.ts
+++ b/packages/assets/generated-icons.ts
@@ -118,6 +118,7 @@ import _EyeOffIcon from './icons/eye-off.svg?component'
 import _FileIcon from './icons/file.svg?component'
 import _FileArchiveIcon from './icons/file-archive.svg?component'
 import _FileCodeIcon from './icons/file-code.svg?component'
+import _FileCogIcon from './icons/file-cog.svg?component'
 import _FileImageIcon from './icons/file-image.svg?component'
 import _FilePlusIcon from './icons/file-plus.svg?component'
 import _FileTextIcon from './icons/file-text.svg?component'
@@ -549,6 +550,7 @@ export const EyeOffIcon = _EyeOffIcon
 export const FileIcon = _FileIcon
 export const FileArchiveIcon = _FileArchiveIcon
 export const FileCodeIcon = _FileCodeIcon
+export const FileCogIcon = _FileCogIcon
 export const FileImageIcon = _FileImageIcon
 export const FilePlusIcon = _FilePlusIcon
 export const FileTextIcon = _FileTextIcon
diff --git a/packages/assets/icons/file-cog.svg b/packages/assets/icons/file-cog.svg
new file mode 100644
index 000000000..b2ed0bd15
--- /dev/null
+++ b/packages/assets/icons/file-cog.svg
@@ -0,0 +1,25 @@
+<!-- @license lucide-static v0.562.0 - ISC -->
+<svg
+  class="lucide lucide-file-cog"
+  xmlns="http://www.w3.org/2000/svg"
+  width="24"
+  height="24"
+  viewBox="0 0 24 24"
+  fill="none"
+  stroke="currentColor"
+  stroke-width="2"
+  stroke-linecap="round"
+  stroke-linejoin="round"
+>
+  <path d="M13.85 22H18a2 2 0 0 0 2-2V8a2 2 0 0 0-.586-1.414l-4-4A2 2 0 0 0 14 2H6a2 2 0 0 0-2 2v6.6" />
+  <path d="M14 2v5a1 1 0 0 0 1 1h5" />
+  <path d="m3.305 19.53.923-.382" />
+  <path d="m4.228 16.852-.924-.383" />
+  <path d="m5.852 15.228-.383-.923" />
+  <path d="m5.852 20.772-.383.924" />
+  <path d="m8.148 15.228.383-.923" />
+  <path d="m8.53 21.696-.382-.924" />
+  <path d="m9.773 16.852.922-.383" />
+  <path d="m9.773 19.148.922.383" />
+  <circle cx="7" cy="18" r="3" />
+</svg>
diff --git a/packages/assets/index.ts b/packages/assets/index.ts
index b7ab443c7..1eb049970 100644
--- a/packages/assets/index.ts
+++ b/packages/assets/index.ts
@@ -11,6 +11,7 @@ import './omorphia.scss'
 import _FourOhFourNotFound from './branding/404.svg?component'
 // Branding
 import _BrowserWindowSuccessIllustration from './branding/illustrations/browser-window-success.svg?component'
+import _InviteBackgroundIllustration from './branding/illustrations/invite-bg.webp?url'
 import _ModrinthIcon from './branding/logo.svg?component'
 import _ModrinthPlusIcon from './branding/modrinth-plus.svg?component'
 import _AngryRinthbot from './branding/rinthbot/angry.webp'
@@ -84,6 +85,7 @@ import _NoTasksIllustration from './illustrations/no-tasks.svg?component'
 
 export const ModrinthIcon = _ModrinthIcon
 export const BrowserWindowSuccessIllustration = _BrowserWindowSuccessIllustration
+export const InviteBackgroundIllustration = _InviteBackgroundIllustration
 export const FourOhFourNotFound = _FourOhFourNotFound
 export const ModrinthPlusIcon = _ModrinthPlusIcon
 export const AngryRinthbot = _AngryRinthbot
diff --git a/packages/moderation/src/types/reports.ts b/packages/moderation/src/types/reports.ts
index 249e457f8..e83b72570 100644
--- a/packages/moderation/src/types/reports.ts
+++ b/packages/moderation/src/types/reports.ts
@@ -1,5 +1,5 @@
-import type { Labrinth } from '@modrinth/api-client'
-import type { Report, Thread, User, Version } from '@modrinth/utils'
+import type { Labrinth, SharedInstances } from '@modrinth/api-client'
+import type { Thread, User, Version } from '@modrinth/utils'
 
 export interface OwnershipTarget {
 	name: string
@@ -8,11 +8,12 @@ export interface OwnershipTarget {
 	type: 'user' | 'organization'
 }
 
-export interface ExtendedReport extends Report {
+export interface ExtendedReport extends Labrinth.Reports.v3.Report {
 	thread: Thread
 	reporter_user: User
 	project?: Labrinth.Projects.v2.Project
 	user?: User
 	version?: Version
 	target?: OwnershipTarget
+	shared_instance?: SharedInstances.Instances.v1.Instance
 }
diff --git a/packages/path-util/src/lib.rs b/packages/path-util/src/lib.rs
index eafa733c0..2d8605d88 100644
--- a/packages/path-util/src/lib.rs
+++ b/packages/path-util/src/lib.rs
@@ -13,6 +13,20 @@ use typed_path::{
 #[repr(transparent)]
 pub struct SafeRelativeUtf8UnixPathBuf(Utf8UnixPathBuf);
 
+pub fn is_safe_file_name(file_name: &str) -> bool {
+    if file_name.contains('/') || file_name.contains('\\') {
+        return false;
+    }
+
+    SafeRelativeUtf8UnixPathBuf::try_from(file_name.to_string()).is_ok_and(
+        |path| {
+            path.components()
+                .exactly_one()
+                .is_ok_and(|component| component.is_normal())
+        },
+    )
+}
+
 impl<'de> Deserialize<'de> for SafeRelativeUtf8UnixPathBuf {
     fn deserialize<D: Deserializer<'de>>(
         deserializer: D,
@@ -146,3 +160,32 @@ fn safe_relative_path_deserialization_contract() {
             .expect_err("Path should be considered invalid");
     }
 }
+
+#[test]
+fn safe_file_name_contract() {
+    let valid_file_names = [
+        "file.txt",
+        "file.name.with.dots.tar.gz",
+        "file..name.jar",
+        "123_456-789.file",
+    ];
+    for file_name in valid_file_names {
+        assert!(is_safe_file_name(file_name));
+    }
+
+    let invalid_file_names = [
+        "",
+        ".",
+        "..",
+        "../file.txt",
+        "directory/file.txt",
+        r"..\file.txt",
+        r"directory\file.txt",
+        "C:file.txt",
+        "C:/file.txt",
+        "NUL.txt",
+    ];
+    for file_name in invalid_file_names {
+        assert!(!is_safe_file_name(file_name));
+    }
+}
diff --git a/packages/ui/src/components/base/Admonition.vue b/packages/ui/src/components/base/Admonition.vue
index 38c09af89..26a3bfef6 100644
--- a/packages/ui/src/components/base/Admonition.vue
+++ b/packages/ui/src/components/base/Admonition.vue
@@ -9,25 +9,47 @@
 		<slot name="icon" :icon-class="['h-6 w-6 flex-none', iconClasses[type]]">
 			<component :is="getSeverityIcon(type)" :class="['h-6 w-6 flex-none', iconClasses[type]]" />
 		</slot>
-		<div class="col-start-2 flex min-w-0 flex-1 flex-col gap-2">
+		<div
+			class="col-start-2 min-w-0"
+			:class="
+				inlineActions && !showActionsUnderneath && $slots.actions
+					? 'flex flex-wrap items-start gap-x-4 gap-y-3'
+					: 'flex flex-1 flex-col gap-2'
+			"
+		>
 			<div
-				v-if="header || $slots.header || normalizedTimestamp"
-				class="flex flex-wrap items-center gap-2 text-lg font-semibold leading-6"
+				class="flex min-w-0 flex-1 flex-col gap-2"
+				:class="
+					inlineActions && !showActionsUnderneath && $slots.actions
+						? 'admonition-inline-content'
+						: ''
+				"
 			>
-				<slot name="header">{{ header }}</slot>
-				<span
-					v-if="normalizedTimestamp"
-					v-tooltip="timestampTooltip"
-					class="flex items-center gap-1.5 text-base font-medium leading-normal text-secondary"
+				<div
+					v-if="header || $slots.header || normalizedTimestamp"
+					class="flex flex-wrap items-center gap-2 text-lg font-semibold leading-6"
 				>
-					<ClockIcon class="size-4" />
-					{{ relativeTimeLabel }}
-				</span>
+					<slot name="header">{{ header }}</slot>
+					<span
+						v-if="normalizedTimestamp"
+						v-tooltip="timestampTooltip"
+						class="flex items-center gap-1.5 text-base font-medium leading-normal text-secondary"
+					>
+						<ClockIcon class="size-4" />
+						{{ relativeTimeLabel }}
+					</span>
+				</div>
+				<div class="font-normal text-contrast/85 leading-tight">
+					<slot>{{ body }}</slot>
+				</div>
 			</div>
-			<div class="font-normal text-contrast/85 leading-tight">
-				<slot>{{ body }}</slot>
+			<div
+				v-if="inlineActions && !showActionsUnderneath && $slots.actions"
+				class="ml-auto flex shrink-0 items-center justify-end self-center"
+			>
+				<slot name="actions" />
 			</div>
-			<div v-if="showActionsUnderneath || $slots.actions" class="mt-2">
+			<div v-else-if="showActionsUnderneath || $slots.actions" class="mt-2">
 				<slot name="actions" />
 			</div>
 		</div>
@@ -80,9 +102,10 @@ import ButtonStyled from './ButtonStyled.vue'
 
 const props = withDefaults(
 	defineProps<{
-		type?: 'info' | 'warning' | 'critical' | 'success' | 'moderation' | 'circle-warning'
+		type?: 'info' | 'warning' | 'critical' | 'success' | 'moderation' | 'circle-warning' | 'neutral'
 		header?: string
 		body?: string
+		inlineActions?: boolean
 		showActionsUnderneath?: boolean
 		dismissible?: boolean
 		progress?: number
@@ -95,6 +118,7 @@ const props = withDefaults(
 		type: 'info',
 		header: '',
 		body: '',
+		inlineActions: false,
 		showActionsUnderneath: false,
 		dismissible: false,
 		progress: undefined,
@@ -143,6 +167,7 @@ const typeClasses = {
 	critical: 'border-brand-red bg-bg-red',
 	success: 'border-brand-green bg-bg-green',
 	moderation: 'border-brand-orange bg-bg-orange',
+	neutral: 'border-surface-4 bg-surface-3',
 }
 
 const iconClasses = {
@@ -152,6 +177,7 @@ const iconClasses = {
 	critical: 'text-brand-red',
 	success: 'text-brand-green',
 	moderation: 'text-brand-orange',
+	neutral: 'text-secondary',
 }
 
 const buttonColors = {
@@ -161,6 +187,7 @@ const buttonColors = {
 	critical: 'red',
 	success: 'green',
 	moderation: 'orange',
+	neutral: 'standard',
 } as const
 
 const progressTrackClasses = {
@@ -170,6 +197,7 @@ const progressTrackClasses = {
 	critical: 'bg-brand-red/20',
 	success: 'bg-brand-green/20',
 	moderation: 'bg-brand-orange/20',
+	neutral: 'bg-surface-4',
 }
 
 const progressFillClasses = {
@@ -181,10 +209,15 @@ const progressFillClasses = {
 	blue: 'bg-brand-blue',
 	green: 'bg-brand-green',
 	red: 'bg-brand-red',
+	neutral: 'bg-surface-5',
 }
 </script>
 
 <style scoped>
+.admonition-inline-content {
+	min-width: min(100%, 16rem);
+}
+
 .admonition-progress--waiting {
 	animation: admonition-progress-waiting 1s linear infinite;
 	position: relative;
diff --git a/packages/ui/src/components/base/FileTreeSelect.vue b/packages/ui/src/components/base/FileTreeSelect.vue
index 4f1a5c278..f64a42912 100644
--- a/packages/ui/src/components/base/FileTreeSelect.vue
+++ b/packages/ui/src/components/base/FileTreeSelect.vue
@@ -34,6 +34,7 @@
 				</div>
 				<div class="ml-2 flex shrink-0 items-center gap-4">
 					<button
+						v-if="showSize"
 						type="button"
 						class="hidden w-[92px] appearance-none items-center gap-1 border-0 bg-transparent p-0 text-left font-semibold hover:text-primary sm:flex"
 						:class="sortField === 'size' ? 'text-contrast' : 'text-secondary'"
@@ -52,6 +53,7 @@
 						/>
 					</button>
 					<button
+						v-if="showModified"
 						type="button"
 						class="hidden w-[132px] appearance-none items-center gap-1 border-0 bg-transparent p-0 text-left font-semibold hover:text-primary sm:flex"
 						:class="sortField === 'modified' ? 'text-contrast' : 'text-secondary'"
@@ -90,8 +92,11 @@
 					{{ formatMessage(messages.parentFolder) }}
 				</span>
 				<div class="ml-2 flex shrink-0 items-center gap-4">
-					<span class="hidden w-[92px] text-left text-sm text-secondary sm:block" />
-					<span class="hidden w-[132px] text-left text-sm text-secondary sm:block" />
+					<span v-if="showSize" class="hidden w-[92px] text-left text-sm text-secondary sm:block" />
+					<span
+						v-if="showModified"
+						class="hidden w-[132px] text-left text-sm text-secondary sm:block"
+					/>
 					<span class="size-4 shrink-0" aria-hidden="true" />
 				</div>
 			</div>
@@ -140,10 +145,16 @@
 					{{ entry.name }}
 				</span>
 				<div class="ml-2 flex shrink-0 items-center gap-4">
-					<span class="hidden w-[92px] truncate text-left text-sm text-secondary sm:block">
+					<span
+						v-if="showSize"
+						class="hidden w-[92px] truncate text-left text-sm text-secondary sm:block"
+					>
 						{{ formatSize(entry) }}
 					</span>
-					<span class="hidden w-[132px] truncate text-left text-sm text-secondary sm:block">
+					<span
+						v-if="showModified"
+						class="hidden w-[132px] truncate text-left text-sm text-secondary sm:block"
+					>
 						{{ formatModified(entry) }}
 					</span>
 					<ChevronRightIcon
@@ -164,8 +175,8 @@
 				<span class="size-4 shrink-0" />
 				<span class="min-w-0 flex-1 truncate text-sm font-medium opacity-0">.</span>
 				<div class="ml-2 flex shrink-0 items-center gap-4">
-					<span class="hidden w-[92px] text-left text-sm sm:block" />
-					<span class="hidden w-[132px] text-left text-sm sm:block" />
+					<span v-if="showSize" class="hidden w-[92px] text-left text-sm sm:block" />
+					<span v-if="showModified" class="hidden w-[132px] text-left text-sm sm:block" />
 					<span class="size-4 shrink-0" />
 				</div>
 			</div>
@@ -262,10 +273,14 @@ const props = withDefaults(
 	defineProps<{
 		items: FileTreeSelectItem[]
 		modelValue: string[]
+		showSize?: boolean
+		showModified?: boolean
 	}>(),
 	{
 		items: () => [],
 		modelValue: () => [],
+		showSize: true,
+		showModified: true,
 	},
 )
 
diff --git a/packages/ui/src/components/base/page-header/metadata/index.vue b/packages/ui/src/components/base/page-header/metadata/index.vue
index c9f14be49..0334bcf2e 100644
--- a/packages/ui/src/components/base/page-header/metadata/index.vue
+++ b/packages/ui/src/components/base/page-header/metadata/index.vue
@@ -1,7 +1,7 @@
 <template>
 	<div
 		ref="metadata"
-		class="page-header-metadata flex min-w-0 flex-wrap items-center gap-x-2 gap-y-2"
+		class="page-header-metadata flex min-w-0 flex-wrap items-center gap-x-[1.625rem] gap-y-2"
 	>
 		<slot />
 	</div>
diff --git a/packages/ui/src/components/base/page-header/metadata/page-header-metadata-item.vue b/packages/ui/src/components/base/page-header/metadata/page-header-metadata-item.vue
index ee8c7e35f..0845c0e11 100644
--- a/packages/ui/src/components/base/page-header/metadata/page-header-metadata-item.vue
+++ b/packages/ui/src/components/base/page-header/metadata/page-header-metadata-item.vue
@@ -1,6 +1,10 @@
 <template>
 	<div :class="rootClass" data-page-header-metadata-item v-bind="$attrs">
-		<BulletDivider class="page-header-metadata-item-divider shrink-0" />
+		<span
+			class="page-header-metadata-item-divider absolute right-full flex h-full w-[1.625rem] items-center justify-center"
+		>
+			<BulletDivider class="shrink-0" />
+		</span>
 		<AutoLink
 			v-if="to && !disabled"
 			v-tooltip="tooltip"
@@ -72,7 +76,7 @@ const props = withDefaults(defineProps<PageHeaderMetadataItemProps>(), {
 
 const defaultIconClass = 'block size-5 shrink-0 text-current'
 const baseClass =
-	'flex min-w-0 items-center gap-2 font-medium leading-none text-secondary text-nowrap'
+	'relative flex min-w-0 items-center font-medium leading-none text-secondary text-nowrap'
 const contentBaseClass = 'inline-flex min-w-0 items-center gap-2 text-inherit'
 const interactiveClass = 'm-0 cursor-pointer border-0 bg-transparent p-0 hover:underline'
 
diff --git a/packages/ui/src/components/index.ts b/packages/ui/src/components/index.ts
index 98a16429f..6d99b45fc 100644
--- a/packages/ui/src/components/index.ts
+++ b/packages/ui/src/components/index.ts
@@ -14,6 +14,7 @@ export * from './project'
 export * from './search'
 export * from './servers'
 export * from './settings'
+export * from './sharing'
 export * from './skin'
 export * from './user'
 export * from './version'
diff --git a/packages/ui/src/components/modal/InstallToPlayModal.vue b/packages/ui/src/components/modal/InstallToPlayModal.vue
deleted file mode 100644
index 972e396be..000000000
--- a/packages/ui/src/components/modal/InstallToPlayModal.vue
+++ /dev/null
@@ -1,111 +0,0 @@
-<template>
-	<NewModal ref="modal" header="Install to play" :closable="true">
-		<div class="flex flex-col gap-4 max-w-[500px]">
-			<Admonition type="info" header="Shared server instance">
-				This server requires modded content to play. Accept to install the needed files from
-				Modrinth.
-			</Admonition>
-
-			<div v-if="sharedBy?.name" class="flex items-center gap-2 text-sm text-secondary">
-				<Avatar
-					v-if="sharedBy?.icon_url"
-					:src="sharedBy.icon_url"
-					:alt="sharedBy.name"
-					size="24px"
-				/>
-				<span>
-					<span class="font-semibold text-contrast">{{ sharedBy.name }}</span>
-					shared this instance with you today.
-				</span>
-			</div>
-
-			<div class="flex flex-col gap-2">
-				<span class="text-sm font-semibold text-secondary">Shared instance</span>
-				<div class="flex items-center gap-3 rounded-xl bg-surface-4 p-3">
-					<Avatar :src="project.icon_url" :alt="project.title" size="48px" />
-					<div class="flex flex-col gap-0.5">
-						<span class="font-semibold text-contrast">{{ project.title }}</span>
-						<span class="text-sm text-secondary">
-							{{ loaderDisplay }} {{ project.game_versions?.[0] }}
-							<template v-if="modCount"> · {{ modCount }} mods </template>
-						</span>
-					</div>
-				</div>
-			</div>
-		</div>
-
-		<template #actions>
-			<div class="flex justify-end gap-2">
-				<ButtonStyled>
-					<button @click="handleDecline">
-						<XIcon />
-						Decline
-					</button>
-				</ButtonStyled>
-				<ButtonStyled color="brand">
-					<button @click="handleAccept">
-						<CheckIcon />
-						Accept
-					</button>
-				</ButtonStyled>
-			</div>
-		</template>
-	</NewModal>
-</template>
-
-<script setup lang="ts">
-import { CheckIcon, XIcon } from '@modrinth/assets'
-import type { Project } from '@modrinth/utils'
-import { computed, ref } from 'vue'
-
-import { useVIntl } from '../../composables'
-import { formatLoader } from '../../utils'
-import Admonition from '../base/Admonition.vue'
-import Avatar from '../base/Avatar.vue'
-import ButtonStyled from '../base/ButtonStyled.vue'
-import NewModal from './NewModal.vue'
-
-const props = defineProps<{
-	project: Project
-	sharedBy?: {
-		name: string
-		icon_url?: string
-	}
-	modCount?: number
-}>()
-
-const emit = defineEmits<{
-	accept: []
-	decline: []
-}>()
-
-const { formatMessage } = useVIntl()
-const modal = ref<InstanceType<typeof NewModal>>()
-
-const loaderDisplay = computed(() => {
-	const loader = props.project.loaders?.[0]
-	if (!loader) return ''
-	return formatLoader(formatMessage, loader)
-})
-
-function handleAccept() {
-	// TODO: Implement accept logic
-	emit('accept')
-	modal.value?.hide()
-}
-
-function handleDecline() {
-	emit('decline')
-	modal.value?.hide()
-}
-
-function show(e?: MouseEvent) {
-	modal.value?.show(e)
-}
-
-function hide() {
-	modal.value?.hide()
-}
-
-defineExpose({ show, hide })
-</script>
diff --git a/packages/ui/src/components/modal/NewModal.vue b/packages/ui/src/components/modal/NewModal.vue
index a199527b3..dee1783b8 100644
--- a/packages/ui/src/components/modal/NewModal.vue
+++ b/packages/ui/src/components/modal/NewModal.vue
@@ -89,11 +89,11 @@
 							ref="scrollContainer"
 							data-modal-content
 							:class="[
-								'flex-1 min-h-0',
-								props.noPadding ? '' : 'overflow-y-auto p-6 !pb-1 sm:pb-6',
+								'flex-1 min-h-0 overflow-y-auto',
+								props.noPadding ? '' : 'p-6 !pb-1 sm:pb-6',
 								{ 'pt-12': props.mergeHeader && closable && !props.noPadding },
 							]"
-							:style="props.noPadding ? {} : { maxHeight: maxContentHeight }"
+							:style="{ maxHeight: maxContentHeight }"
 							@scroll="checkScrollState"
 						>
 							<slot> You just lost the game.</slot>
@@ -231,6 +231,7 @@ const visible = ref(false)
 const stackDepth = ref(0)
 const modalBodyRef = ref<HTMLElement | null>(null)
 let previousFocusEl: Element | null = null
+let hideTimeout: ReturnType<typeof setTimeout> | null = null
 
 const scrollContainer = ref<HTMLElement | null>(null)
 const { showTopFade, showBottomFade, checkScrollState } = useScrollIndicator(scrollContainer)
@@ -244,6 +245,10 @@ function getFocusableElements(): HTMLElement[] {
 }
 
 function show(event?: MouseEvent) {
+	if (hideTimeout) {
+		clearTimeout(hideTimeout)
+		hideTimeout = null
+	}
 	props.onShow?.()
 	const wasEmpty = modalStackSize() === 0
 	stackDepth.value = modalStackSize()
@@ -292,8 +297,9 @@ function hide() {
 		previousFocusEl.focus()
 	}
 	previousFocusEl = null
-	setTimeout(() => {
+	hideTimeout = setTimeout(() => {
 		open.value = false
+		hideTimeout = null
 		nextTick(() => props.onAfterHide?.())
 	}, 300)
 }
@@ -340,6 +346,10 @@ function resetMousePosition() {
 }
 
 onUnmounted(() => {
+	if (hideTimeout) {
+		clearTimeout(hideTimeout)
+		hideTimeout = null
+	}
 	if (open.value) {
 		popModal()
 		window.removeEventListener('keydown', handleWindowKeyDown)
diff --git a/packages/ui/src/components/modal/index.ts b/packages/ui/src/components/modal/index.ts
index 6ac4eacaf..d85ee9c88 100644
--- a/packages/ui/src/components/modal/index.ts
+++ b/packages/ui/src/components/modal/index.ts
@@ -1,6 +1,5 @@
 export { default as ConfirmLeaveModal } from './ConfirmLeaveModal.vue'
 export { default as ConfirmModal } from './ConfirmModal.vue'
-export { default as InstallToPlayModal } from './InstallToPlayModal.vue'
 export { default as Modal } from './Modal.vue'
 export { default as NewModal } from './NewModal.vue'
 export type { ServerProject as OpenInAppModalServerProject } from './OpenInAppModal.vue'
diff --git a/packages/ui/src/components/nav/PopupNotificationPanel.vue b/packages/ui/src/components/nav/PopupNotificationPanel.vue
index a87f0b164..f30c18bf0 100644
--- a/packages/ui/src/components/nav/PopupNotificationPanel.vue
+++ b/packages/ui/src/components/nav/PopupNotificationPanel.vue
@@ -18,6 +18,7 @@
 				<NotificationToast
 					v-if="item.toast"
 					:type="item.toast.type"
+					:action-loading="toastActionLoading(item.id)"
 					:actor-name="item.toast.actorName"
 					:actor-avatar-url="item.toast.actorAvatarUrl"
 					:entity-name="item.toast.entityName"
@@ -29,7 +30,7 @@
 					:progress-type="item.toast.progressType"
 					:progress-current="item.toast.progressCurrent"
 					:progress-total="item.toast.progressTotal"
-					@accept="handleToastAction(item, item.toast.onAccept)"
+					@accept="handleToastAccept(item, item.toast.onAccept)"
 					@decline="handleToastAction(item, item.toast.onDecline)"
 					@dismiss="handleToastAction(item, item.toast.onDismiss)"
 					@launch="handleToastAction(item, item.toast.onLaunch)"
@@ -167,7 +168,7 @@ import {
 	XCircleIcon,
 	XIcon,
 } from '@modrinth/assets'
-import { computed } from 'vue'
+import { computed, ref } from 'vue'
 
 import { useModalStack } from '../../composables/modal-stack'
 import {
@@ -189,11 +190,13 @@ const hasModalActive = computed(() => stackCount.value > 0)
 const notificationGroupStyle = computed(() => ({
 	zIndex: hasModalActive.value ? 100 + stackCount.value * 10 + 8 : 200,
 }))
+const activeToastActions = ref<Record<string, 'accept'>>({})
 
 const stopTimer = (n: PopupNotification) => popupNotificationManager.stopNotificationTimer(n)
 const setNotificationTimer = (n: PopupNotification) =>
 	popupNotificationManager.setNotificationTimer(n)
 const dismiss = (id: string | number) => popupNotificationManager.removeNotification(id)
+const toastActionLoading = (id: string | number) => activeToastActions.value[String(id)] ?? null
 
 function isDownloadNotification(item: PopupNotification) {
 	return (
@@ -265,6 +268,26 @@ async function handleToastAction(item: PopupNotification, action?: () => void |
 	await action?.()
 }
 
+async function handleToastAccept(item: PopupNotification, action?: () => void | Promise<void>) {
+	if (toastActionLoading(item.id) != null) return
+
+	const actionId = String(item.id)
+	popupNotificationManager.stopNotificationTimer(item)
+	activeToastActions.value = {
+		...activeToastActions.value,
+		[actionId]: 'accept',
+	}
+
+	try {
+		await action?.()
+	} finally {
+		activeToastActions.value = Object.fromEntries(
+			Object.entries(activeToastActions.value).filter(([key]) => key !== actionId),
+		)
+		popupNotificationManager.removeNotification(item.id)
+	}
+}
+
 function progressColorForType(type: PopupNotification['type']) {
 	if (type === 'error') {
 		return 'red'
diff --git a/packages/ui/src/components/notifications/NotificationToast.vue b/packages/ui/src/components/notifications/NotificationToast.vue
index bca9f41f6..3bab0b94e 100644
--- a/packages/ui/src/components/notifications/NotificationToast.vue
+++ b/packages/ui/src/components/notifications/NotificationToast.vue
@@ -4,11 +4,11 @@
 	>
 		<div v-if="isInviteNotification" class="flex w-full items-start gap-3">
 			<Avatar
-				:src="actorAvatarUrl"
-				:alt="actorLabel"
-				:tint-by="actorLabel"
+				:src="inviteAvatarUrl"
+				:alt="inviteAvatarLabel"
+				:tint-by="inviteAvatarLabel"
 				size="44px"
-				circle
+				:circle="inviteAvatarCircle"
 				no-shadow
 				class="border border-solid border-surface-5"
 			/>
@@ -35,20 +35,17 @@
 								>.
 							</template>
 							<template v-else>
-								<span class="inline-flex max-w-full items-center gap-[5px] align-[-4px]">
-									<Avatar
-										:src="entityIconUrl"
-										:alt="entityLabel"
-										size="24px"
-										no-shadow
-										raised
-										:tint-by="entityLabel"
-										class="!rounded-[7px]"
-									/>
-									<span class="min-w-0 truncate font-semibold text-contrast">{{
-										entityLabel
-									}}</span> </span
-								>.
+								<Avatar
+									:src="entityIconUrl"
+									:alt="entityLabel"
+									:tint-by="entityLabel"
+									size="28px"
+									no-shadow
+									raised
+									class="inline-block !rounded-lg align-middle"
+								/>
+								<span class="ml-1 font-semibold text-contrast">{{ entityLabel }}</span>
+								<span> instance.</span>
 							</template>
 						</template>
 					</p>
@@ -65,10 +62,17 @@
 				</div>
 				<div class="flex items-center gap-2">
 					<ButtonStyled color="brand">
-						<button @click="$emit('accept')">Accept</button>
+						<button :disabled="actionLoading != null" @click="$emit('accept')">
+							<SpinnerIcon v-if="actionLoading === 'accept'" class="animate-spin" />
+							<CheckIcon v-else />
+							Accept
+						</button>
 					</ButtonStyled>
 					<ButtonStyled type="outlined">
-						<button @click="$emit('decline')">Decline</button>
+						<button :disabled="actionLoading != null" @click="$emit('decline')">
+							<XIcon />
+							Decline
+						</button>
 					</ButtonStyled>
 				</div>
 			</div>
@@ -175,7 +179,7 @@
 </template>
 
 <script setup lang="ts">
-import { XIcon } from '@modrinth/assets'
+import { CheckIcon, SpinnerIcon, XIcon } from '@modrinth/assets'
 import { computed, ref } from 'vue'
 
 import { useFormatBytes, useFormatNumber } from '../../composables'
@@ -190,10 +194,12 @@ type NotificationToastType =
 	| 'instance-invite'
 	| 'instance-download'
 	| 'instance-ready'
+type NotificationToastAction = 'accept'
 
 const props = withDefaults(
 	defineProps<{
 		type: NotificationToastType
+		actionLoading?: NotificationToastAction | null
 		actorName?: string | null
 		actorAvatarUrl?: string | null
 		entityName?: string
@@ -209,6 +215,7 @@ const props = withDefaults(
 		actions?: PopupNotificationButton[]
 	}>(),
 	{
+		actionLoading: null,
 		actorName: null,
 		actorAvatarUrl: null,
 		entityName: '',
@@ -239,6 +246,9 @@ const isInviteNotification = computed(
 
 const actorLabel = computed(() => props.actorName || 'Someone')
 const entityLabel = computed(() => props.entityName || '')
+const inviteAvatarUrl = computed(() => props.actorAvatarUrl)
+const inviteAvatarLabel = computed(() => actorLabel.value)
+const inviteAvatarCircle = computed(() => true)
 const progressValue = computed(() => Math.max(0, Math.min(1, props.progress ?? 0)))
 const progressPercent = computed(() => Math.round(progressValue.value * 100))
 const isWaitingProgress = computed(() => props.type === 'instance-download' && props.waiting)
@@ -250,7 +260,7 @@ const inviteActionText = computed(() => {
 		return 'invited you to manage the server'
 	}
 
-	return 'invited you to play the instance'
+	return 'invited you to'
 })
 
 const resolvedStatusText = computed(() => {
diff --git a/packages/ui/src/components/sharing/index.ts b/packages/ui/src/components/sharing/index.ts
new file mode 100644
index 000000000..9404102e4
--- /dev/null
+++ b/packages/ui/src/components/sharing/index.ts
@@ -0,0 +1,2 @@
+export { default as InvitePlayersModal } from './invite-players-modal/index.vue'
+export * from './invite-players-modal/types'
diff --git a/packages/ui/src/components/sharing/invite-players-modal/index.vue b/packages/ui/src/components/sharing/invite-players-modal/index.vue
new file mode 100644
index 000000000..cefbb7aee
--- /dev/null
+++ b/packages/ui/src/components/sharing/invite-players-modal/index.vue
@@ -0,0 +1,393 @@
+<template>
+	<NewModal
+		ref="modal"
+		:header="header"
+		width="min(34rem, calc(100vw - 2rem))"
+		max-width="34rem"
+		no-padding
+		noblur
+	>
+		<div class="flex max-h-[calc(100vh-8rem)] min-h-0 flex-col">
+			<div class="border-0 border-b border-solid border-surface-5 p-6">
+				<div class="flex items-start gap-2">
+					<Combobox
+						:key="searchInputKey"
+						:model-value="undefined"
+						:options="searchOptions"
+						:search-value="searchTarget"
+						:search-placeholder="searchPlaceholderLabel"
+						:placeholder="searchPlaceholderLabel"
+						:no-options-message="searchLookupMessage"
+						:min-search-length-to-open="searchMinimumLength"
+						:disable-search-filter="usesRemoteSearch"
+						class="min-w-0 flex-1"
+						searchable
+						show-search-icon
+						:show-chevron="false"
+						search-type="search"
+						search-name="modrinth-player-invite-search"
+						search-inputmode="search"
+						search-autocomplete="new-password"
+						search-autocorrect="off"
+						search-autocapitalize="none"
+						:search-spellcheck="false"
+						:search-input-attrs="passwordManagerIgnoreAttrs"
+						@search-input="handleSearchInput"
+						@select="handleSearchSelect"
+					>
+						<template #option="{ item, isSelected }">
+							<div class="flex min-w-0 items-center gap-2">
+								<Avatar
+									:src="findSearchUser(item.value)?.avatarUrl"
+									:alt="formatMessage(messages.avatarAlt, { username: item.label })"
+									:tint-by="item.label"
+									size="1.5rem"
+									circle
+									no-shadow
+								/>
+								<span
+									class="min-w-0 truncate font-semibold"
+									:class="isSelected ? 'text-contrast' : 'text-primary'"
+								>
+									{{ item.label }}
+								</span>
+							</div>
+						</template>
+					</Combobox>
+					<ButtonStyled color="brand">
+						<button
+							v-tooltip="searchInviteTooltip"
+							class="shrink-0"
+							:disabled="!canInviteSearchTarget"
+							@click="inviteSearchTarget"
+						>
+							<PlusIcon aria-hidden="true" />
+							{{ addButtonLabel }}
+						</button>
+					</ButtonStyled>
+				</div>
+			</div>
+
+			<div class="min-h-[11rem] overflow-y-auto bg-surface-2 px-6 py-4">
+				<div class="mb-2 text-base font-semibold text-primary">
+					{{ friendsHeading }}
+				</div>
+				<div
+					v-if="friends.length === 0"
+					class="flex min-h-32 items-center justify-center text-secondary"
+				>
+					{{ emptyFriendsLabel }}
+				</div>
+				<div v-else class="-mx-6 flex flex-col">
+					<InvitePlayersModalUserRow
+						v-for="friend in sortedFriends"
+						:key="friend.id"
+						:user="friend"
+						:avatar-alt="formatMessage(messages.avatarAlt, { username: friend.username })"
+						:added-label="addedButtonLabel"
+						:cancel-label="cancelButtonLabel"
+						:invite-label="inviteButtonLabel"
+						:requested-label="requestedButtonLabel"
+						:requested-tooltip="requestedTooltip(friend.username)"
+						:user-profile-link="userProfileLink"
+						@invite="inviteFriend"
+						@cancel="cancelInvite"
+					/>
+				</div>
+			</div>
+
+			<div v-if="link" class="border-0 border-t border-solid border-surface-5 p-6">
+				<div class="flex flex-col gap-2">
+					<div class="text-base font-semibold text-contrast">
+						{{ inviteLinkHeading }}
+					</div>
+					<ButtonStyled>
+						<button
+							type="button"
+							class="!h-10 w-full !justify-between !px-4 text-left !shadow-none"
+							@click="copyInviteLink"
+						>
+							<span class="min-w-0 truncate text-base font-semibold text-primary">
+								{{ link }}
+							</span>
+							<ClipboardCopyIcon class="size-5 shrink-0 text-secondary" aria-hidden="true" />
+						</button>
+					</ButtonStyled>
+					<p v-if="link && linkExpiryDescription" class="m-0 text-base text-primary">
+						{{ linkExpiryDescription }}
+						<button
+							v-if="updateInviteLink"
+							type="button"
+							class="cursor-pointer border-0 bg-transparent p-0 text-base font-medium text-blue hover:underline"
+							@click="inviteLinkEditor?.show()"
+						>
+							{{ formatMessage(messages.editInviteLink) }}
+						</button>
+					</p>
+				</div>
+			</div>
+		</div>
+	</NewModal>
+
+	<InvitePlayersModalInviteLinkEditor
+		v-if="updateInviteLink"
+		ref="inviteLinkEditor"
+		:link-expires-at="linkExpiresAt"
+		:link-max-uses="linkMaxUses"
+		:update-invite-link="updateInviteLink"
+	/>
+</template>
+
+<script setup lang="ts">
+import { ClipboardCopyIcon, PlusIcon } from '@modrinth/assets'
+import { computed, ref } from 'vue'
+
+import { defineMessages, useVIntl } from '../../../composables/i18n'
+import { injectNotificationManager } from '../../../providers'
+import Avatar from '../../base/Avatar.vue'
+import ButtonStyled from '../../base/ButtonStyled.vue'
+import Combobox from '../../base/Combobox.vue'
+import NewModal from '../../modal/NewModal.vue'
+import InvitePlayersModalInviteLinkEditor from './invite-players-modal-invite-link-editor.vue'
+import InvitePlayersModalUserRow from './invite-players-modal-user-row.vue'
+import type {
+	InviteLinkSettings,
+	InvitePlayersInvitePayload,
+	InvitePlayersSearchUser,
+	InvitePlayersUser,
+	InvitePlayersUserProfileLink,
+} from './types'
+import { useInvitePlayersSearch } from './use-invite-players-search'
+
+const props = withDefaults(
+	defineProps<{
+		header?: string
+		friends?: InvitePlayersUser[]
+		suggestions?: InvitePlayersSearchUser[]
+		searchUsers?: (query: string) => Promise<InvitePlayersSearchUser[]>
+		link?: string
+		linkExpiresAt?: string | Date | null
+		linkMaxUses?: number
+		updateInviteLink?: (settings: InviteLinkSettings) => Promise<void>
+		friendsLabel?: string
+		searchPlaceholder?: string
+		addLabel?: string
+		inviteLabel?: string
+		addedLabel?: string
+		cancelLabel?: string
+		requestedLabel?: string
+		emptyFriendsLabel?: string
+		canInvite?: boolean
+		inviteDisabledMessage?: string
+		userProfileLink?: (username: string) => InvitePlayersUserProfileLink
+	}>(),
+	{
+		header: 'Share instance',
+		friends: () => [],
+		suggestions: () => [],
+		canInvite: true,
+		linkMaxUses: 10,
+	},
+)
+
+const emit = defineEmits<{
+	invite: [payload: InvitePlayersInvitePayload]
+	cancel: [user: InvitePlayersUser]
+	'copy-link': [link: string]
+}>()
+
+const { formatMessage } = useVIntl()
+const notificationManager = injectNotificationManager(null)
+const modal = ref<InstanceType<typeof NewModal> | null>(null)
+const inviteLinkEditor = ref<InstanceType<typeof InvitePlayersModalInviteLinkEditor> | null>(null)
+
+const messages = defineMessages({
+	friendsHeading: {
+		id: 'sharing.invite-players-modal.friends-heading',
+		defaultMessage: 'Your friends - {count}',
+	},
+	searchPlaceholder: {
+		id: 'sharing.invite-players-modal.search-placeholder',
+		defaultMessage: 'Enter Modrinth username',
+	},
+	addButton: {
+		id: 'sharing.invite-players-modal.add',
+		defaultMessage: 'Add',
+	},
+	inviteButton: {
+		id: 'sharing.invite-players-modal.invite',
+		defaultMessage: 'Invite',
+	},
+	addedButton: {
+		id: 'sharing.invite-players-modal.added',
+		defaultMessage: 'Added',
+	},
+	cancelButton: {
+		id: 'sharing.invite-players-modal.cancel',
+		defaultMessage: 'Cancel',
+	},
+	requestedButton: {
+		id: 'sharing.invite-players-modal.requested',
+		defaultMessage: 'Request sent',
+	},
+	requestedTooltip: {
+		id: 'sharing.invite-players-modal.requested-tooltip',
+		defaultMessage: '{username} needs to accept your friend request first',
+	},
+	noFriends: {
+		id: 'sharing.invite-players-modal.no-friends',
+		defaultMessage: 'No friends found.',
+	},
+	noSearchResults: {
+		id: 'sharing.invite-players-modal.no-search-results',
+		defaultMessage: 'No matching users found.',
+	},
+	searching: {
+		id: 'sharing.invite-players-modal.searching',
+		defaultMessage: 'Searching...',
+	},
+	alreadyInvited: {
+		id: 'sharing.invite-players-modal.already-invited',
+		defaultMessage: 'This user has already been invited.',
+	},
+	inviteLinkHeading: {
+		id: 'sharing.invite-players-modal.invite-link-heading',
+		defaultMessage: 'Or use an invite link',
+	},
+	inviteExpiryDescription: {
+		id: 'sharing.invite-players-modal.invite-expiry-description',
+		defaultMessage: 'Your invite link expires in {duration}.',
+	},
+	editInviteLink: {
+		id: 'sharing.invite-players-modal.edit-invite-link',
+		defaultMessage: 'Edit invite link.',
+	},
+	linkCopiedTitle: {
+		id: 'sharing.invite-players-modal.link-copied-title',
+		defaultMessage: 'Link copied',
+	},
+	linkCopiedText: {
+		id: 'sharing.invite-players-modal.link-copied-text',
+		defaultMessage: 'The invite link has been copied to your clipboard.',
+	},
+	linkCopyFailedTitle: {
+		id: 'sharing.invite-players-modal.link-copy-failed-title',
+		defaultMessage: 'Failed to copy link',
+	},
+	avatarAlt: {
+		id: 'sharing.invite-players-modal.avatar-alt',
+		defaultMessage: "{username}'s avatar",
+	},
+})
+
+const friendsHeading = computed(
+	() =>
+		props.friendsLabel ??
+		formatMessage(messages.friendsHeading, {
+			count: props.friends.length,
+		}),
+)
+const searchPlaceholderLabel = computed(
+	() => props.searchPlaceholder ?? formatMessage(messages.searchPlaceholder),
+)
+const addButtonLabel = computed(() => props.addLabel ?? formatMessage(messages.addButton))
+const inviteButtonLabel = computed(() => props.inviteLabel ?? formatMessage(messages.inviteButton))
+const addedButtonLabel = computed(() => props.addedLabel ?? formatMessage(messages.addedButton))
+const cancelButtonLabel = computed(() => props.cancelLabel ?? formatMessage(messages.cancelButton))
+const requestedButtonLabel = computed(
+	() => props.requestedLabel ?? formatMessage(messages.requestedButton),
+)
+const requestedTooltip = (username: string) =>
+	formatMessage(messages.requestedTooltip, {
+		username,
+	})
+const emptyFriendsLabel = computed(
+	() => props.emptyFriendsLabel ?? formatMessage(messages.noFriends),
+)
+const inviteLinkHeading = computed(() => formatMessage(messages.inviteLinkHeading))
+const linkExpiryDescription = computed(() => {
+	if (!props.linkExpiresAt) return ''
+
+	const expiresAt = new Date(props.linkExpiresAt)
+	if (Number.isNaN(expiresAt.getTime())) return ''
+	const hours = Math.max(1, Math.ceil((expiresAt.getTime() - Date.now()) / 3_600_000))
+	const duration =
+		hours < 48 ? `${hours} ${hours === 1 ? 'hour' : 'hours'}` : `${Math.ceil(hours / 24)} days`
+
+	return formatMessage(messages.inviteExpiryDescription, { duration })
+})
+const inviteDisabledMessage = computed(
+	() => props.inviteDisabledMessage ?? formatMessage(messages.alreadyInvited),
+)
+const {
+	searchTarget,
+	searchInputKey,
+	searchOptions,
+	searchLookupMessage,
+	searchMinimumLength,
+	usesRemoteSearch,
+	passwordManagerIgnoreAttrs,
+	sortedFriends,
+	canInviteSearchTarget,
+	searchInviteTooltip,
+	findSearchUser,
+	handleSearchInput,
+	handleSearchSelect,
+	inviteSearchTarget,
+	resetSearch,
+} = useInvitePlayersSearch({
+	friends: () => props.friends,
+	suggestions: () => props.suggestions,
+	searchUsers: () => props.searchUsers,
+	canInvite: () => props.canInvite,
+	inviteDisabledMessage,
+	alreadyInvitedMessage: () => formatMessage(messages.alreadyInvited),
+	searchingMessage: () => formatMessage(messages.searching),
+	noResultsMessage: () => formatMessage(messages.noSearchResults),
+	onInvite: (payload) => emit('invite', payload),
+})
+
+function inviteFriend(friend: InvitePlayersUser) {
+	emit('invite', {
+		user: friend,
+		source: 'friend',
+	})
+}
+
+function cancelInvite(friend: InvitePlayersUser) {
+	emit('cancel', friend)
+}
+
+async function copyInviteLink() {
+	if (!props.link) return
+
+	emit('copy-link', props.link)
+
+	try {
+		await navigator.clipboard.writeText(props.link)
+		notificationManager?.addNotification({
+			type: 'success',
+			title: formatMessage(messages.linkCopiedTitle),
+			text: formatMessage(messages.linkCopiedText),
+		})
+	} catch (error) {
+		const message = error instanceof Error ? error.message : String(error)
+		notificationManager?.addNotification({
+			type: 'error',
+			title: formatMessage(messages.linkCopyFailedTitle),
+			text: message,
+		})
+	}
+}
+
+function show(event?: MouseEvent) {
+	resetSearch()
+	modal.value?.show(event)
+}
+
+function hide() {
+	modal.value?.hide()
+}
+
+defineExpose({ show, hide })
+</script>
diff --git a/packages/ui/src/components/sharing/invite-players-modal/invite-players-modal-invite-link-editor.vue b/packages/ui/src/components/sharing/invite-players-modal/invite-players-modal-invite-link-editor.vue
new file mode 100644
index 000000000..60264bc2d
--- /dev/null
+++ b/packages/ui/src/components/sharing/invite-players-modal/invite-players-modal-invite-link-editor.vue
@@ -0,0 +1,167 @@
+<template>
+	<NewModal ref="modal" :header="formatMessage(messages.title)" max-width="30rem">
+		<div class="flex flex-col gap-6">
+			<div class="flex flex-col gap-2">
+				<span class="font-semibold text-contrast">{{ formatMessage(messages.expiryLabel) }}</span>
+				<DatePicker
+					v-model="expiry"
+					:disabled="saving"
+					:min-date="minimumExpiry"
+					:max-date="maximumExpiry"
+					date-format="Y-m-d H:i"
+					alt-format="F j, Y at h:i K"
+					enable-time
+					wrapper-class="w-full"
+					input-class="w-full"
+				/>
+			</div>
+			<div class="flex flex-col gap-2">
+				<span class="font-semibold text-contrast">{{ formatMessage(messages.maxUsesLabel) }}</span>
+				<StyledInput
+					v-model="maxUses"
+					type="number"
+					:min="1"
+					:max="2147483647"
+					:step="1"
+					:disabled="saving"
+				/>
+			</div>
+		</div>
+		<template #actions>
+			<div class="flex justify-end gap-2">
+				<ButtonStyled>
+					<button :disabled="saving" @click="modal?.hide()">
+						<XIcon aria-hidden="true" />
+						{{ formatMessage(messages.cancel) }}
+					</button>
+				</ButtonStyled>
+				<ButtonStyled color="brand">
+					<button :disabled="!canSave" @click="save">
+						<SpinnerIcon v-if="saving" class="animate-spin" aria-hidden="true" />
+						<SaveIcon v-else aria-hidden="true" />
+						{{ formatMessage(messages.save) }}
+					</button>
+				</ButtonStyled>
+			</div>
+		</template>
+	</NewModal>
+</template>
+
+<script setup lang="ts">
+import { SaveIcon, SpinnerIcon, XIcon } from '@modrinth/assets'
+import { computed, ref } from 'vue'
+
+import { defineMessages, useVIntl } from '../../../composables/i18n'
+import { injectNotificationManager } from '../../../providers'
+import ButtonStyled from '../../base/ButtonStyled.vue'
+import DatePicker from '../../base/DatePicker.vue'
+import StyledInput from '../../base/StyledInput.vue'
+import NewModal from '../../modal/NewModal.vue'
+import type { InviteLinkSettings } from './types'
+
+const props = defineProps<{
+	linkExpiresAt?: string | Date | null
+	linkMaxUses: number
+	updateInviteLink?: (settings: InviteLinkSettings) => Promise<void>
+}>()
+const { formatMessage } = useVIntl()
+const notificationManager = injectNotificationManager(null)
+const modal = ref<InstanceType<typeof NewModal> | null>(null)
+const expiry = ref('')
+const maxUses = ref<number>()
+const minimumExpiry = ref(new Date())
+const maximumExpiry = ref(new Date())
+const saving = ref(false)
+
+const messages = defineMessages({
+	title: {
+		id: 'sharing.invite-players-modal.edit-invite-link-title',
+		defaultMessage: 'Edit invite link',
+	},
+	expiryLabel: {
+		id: 'sharing.invite-players-modal.expiry-label',
+		defaultMessage: 'Expiry date',
+	},
+	maxUsesLabel: {
+		id: 'sharing.invite-players-modal.max-uses-label',
+		defaultMessage: 'Maximum uses',
+	},
+	cancel: {
+		id: 'sharing.invite-players-modal.cancel-button',
+		defaultMessage: 'Cancel',
+	},
+	save: {
+		id: 'sharing.invite-players-modal.save-button',
+		defaultMessage: 'Save',
+	},
+	failed: {
+		id: 'sharing.invite-players-modal.update-invite-link-failed-title',
+		defaultMessage: 'Failed to update invite link',
+	},
+})
+
+const canSave = computed(() => {
+	const date = parseLocalDate(expiry.value)
+	return (
+		!saving.value &&
+		!!date &&
+		date >= minimumExpiry.value &&
+		date <= maximumExpiry.value &&
+		Number.isInteger(maxUses.value ?? 0) &&
+		(maxUses.value ?? 0) > 0 &&
+		(maxUses.value ?? 0) <= 2147483647
+	)
+})
+
+function formatLocalDate(date: Date) {
+	const pad = (value: number) => value.toString().padStart(2, '0')
+	return `${date.getFullYear()}-${pad(date.getMonth() + 1)}-${pad(date.getDate())} ${pad(date.getHours())}:${pad(date.getMinutes())}`
+}
+
+function parseLocalDate(value: string) {
+	const match = /^(\d{4})-(\d{2})-(\d{2}) (\d{2}):(\d{2})$/.exec(value)
+	if (!match) return null
+	const [, year, month, day, hour, minute] = match
+	const date = new Date(Number(year), Number(month) - 1, Number(day), Number(hour), Number(minute))
+	return Number.isNaN(date.getTime()) ? null : date
+}
+
+function show() {
+	const now = new Date()
+	minimumExpiry.value = new Date(now.getTime() + 3_600_000)
+	minimumExpiry.value.setSeconds(0, 0)
+	minimumExpiry.value.setMinutes(minimumExpiry.value.getMinutes() + 1)
+	maximumExpiry.value = new Date(now.getTime() + 7 * 86_400_000)
+	maximumExpiry.value.setSeconds(0, 0)
+	const currentExpiry = props.linkExpiresAt ? new Date(props.linkExpiresAt) : maximumExpiry.value
+	const date =
+		Number.isNaN(currentExpiry.getTime()) || currentExpiry < minimumExpiry.value
+			? minimumExpiry.value
+			: currentExpiry > maximumExpiry.value
+				? maximumExpiry.value
+				: currentExpiry
+	expiry.value = formatLocalDate(date)
+	maxUses.value = props.linkMaxUses
+	modal.value?.show()
+}
+
+async function save() {
+	const date = parseLocalDate(expiry.value)
+	if (!canSave.value || !date || !props.updateInviteLink) return
+	saving.value = true
+	try {
+		await props.updateInviteLink({ expiresAt: date, maxUses: maxUses.value ?? 1 })
+		modal.value?.hide()
+	} catch (error) {
+		notificationManager?.addNotification({
+			type: 'error',
+			title: formatMessage(messages.failed),
+			text: error instanceof Error ? error.message : String(error),
+		})
+	} finally {
+		saving.value = false
+	}
+}
+
+defineExpose({ show })
+</script>
diff --git a/packages/ui/src/components/sharing/invite-players-modal/invite-players-modal-user-row.vue b/packages/ui/src/components/sharing/invite-players-modal/invite-players-modal-user-row.vue
new file mode 100644
index 000000000..673c105e9
--- /dev/null
+++ b/packages/ui/src/components/sharing/invite-players-modal/invite-players-modal-user-row.vue
@@ -0,0 +1,101 @@
+<template>
+	<div
+		class="flex h-10 items-center justify-between gap-3 px-6 transition-colors hover:bg-surface-3"
+	>
+		<div class="flex min-w-0 items-center gap-1.5">
+			<AutoLink
+				v-tooltip="user.username"
+				:to="profileLink"
+				:target="profileTarget"
+				class="inline-flex min-w-0 items-center gap-1.5"
+				:class="profileLink ? 'text-primary hover:underline' : ''"
+			>
+				<span class="relative flex shrink-0">
+					<Avatar
+						:src="user.avatarUrl"
+						:alt="avatarAlt"
+						:tint-by="user.username"
+						size="1.5rem"
+						circle
+						no-shadow
+					/>
+					<span
+						v-if="user.online"
+						class="absolute bottom-[1.5px] right-[-1.5px] size-[9px] rounded-full border-[1.5px] border-solid border-surface-2 bg-brand"
+					/>
+				</span>
+				<span class="min-w-0 truncate text-base font-medium">
+					{{ user.username }}
+				</span>
+			</AutoLink>
+		</div>
+
+		<ButtonStyled v-if="status === 'added'" type="standard" color-fill="none">
+			<button disabled>
+				<CheckIcon aria-hidden="true" />
+				{{ addedLabel }}
+			</button>
+		</ButtonStyled>
+		<ButtonStyled v-else-if="status === 'pending'" type="outlined">
+			<button @click="$emit('cancel', user)">
+				{{ cancelLabel }}
+			</button>
+		</ButtonStyled>
+		<span v-else-if="status === 'requested'" v-tooltip="requestedTooltip" class="inline-flex">
+			<ButtonStyled type="standard" color-fill="none">
+				<button disabled>
+					{{ requestedLabel }}
+				</button>
+			</ButtonStyled>
+		</span>
+		<ButtonStyled v-else color-fill="none">
+			<button @click="$emit('invite', user)">
+				{{ inviteLabel }}
+			</button>
+		</ButtonStyled>
+	</div>
+</template>
+
+<script setup lang="ts">
+import { CheckIcon } from '@modrinth/assets'
+import { computed } from 'vue'
+
+import AutoLink from '../../base/AutoLink.vue'
+import Avatar from '../../base/Avatar.vue'
+import ButtonStyled from '../../base/ButtonStyled.vue'
+import type { InvitePlayersUser, InvitePlayersUserProfileLink } from './types'
+
+const props = withDefaults(
+	defineProps<{
+		user: InvitePlayersUser
+		avatarAlt: string
+		addedLabel: string
+		cancelLabel: string
+		inviteLabel: string
+		requestedLabel: string
+		requestedTooltip: string
+		userProfileLink?: (username: string) => InvitePlayersUserProfileLink
+	}>(),
+	{
+		userProfileLink: undefined,
+	},
+)
+
+defineEmits<{
+	invite: [user: InvitePlayersUser]
+	cancel: [user: InvitePlayersUser]
+}>()
+
+const status = computed(() => props.user.status ?? 'available')
+const profileLink = computed(() => getUserProfileLink(props.user.username))
+const profileTarget = computed(() =>
+	typeof profileLink.value === 'string' && profileLink.value.startsWith('http')
+		? '_blank'
+		: undefined,
+)
+
+function getUserProfileLink(username: string): InvitePlayersUserProfileLink {
+	if (!username || username.includes('@')) return undefined
+	return props.userProfileLink?.(username) ?? `/user/${encodeURIComponent(username)}`
+}
+</script>
diff --git a/packages/ui/src/components/sharing/invite-players-modal/types.ts b/packages/ui/src/components/sharing/invite-players-modal/types.ts
new file mode 100644
index 000000000..693661259
--- /dev/null
+++ b/packages/ui/src/components/sharing/invite-players-modal/types.ts
@@ -0,0 +1,36 @@
+import type { RouteLocationRaw } from 'vue-router'
+
+export type InvitePlayersUserStatus = 'available' | 'requested' | 'pending' | 'added'
+export type InvitePlayersUserProfileLink =
+	| RouteLocationRaw
+	| (() => void | Promise<void>)
+	| undefined
+
+export interface InvitePlayersUser {
+	id: string
+	username: string
+	avatarUrl?: string | null
+	status?: InvitePlayersUserStatus
+	online?: boolean
+}
+
+export interface InvitePlayersSearchUser {
+	id: string
+	username: string
+	avatarUrl?: string | null
+	email?: string
+}
+
+export interface InvitePlayersInvitePayload {
+	user: InvitePlayersUser
+	source: 'friend' | 'search'
+}
+
+export interface InviteLinkSettings {
+	expiresAt: Date
+	maxUses: number
+}
+
+export function normalizeInviteKey(value: string) {
+	return value.trim().toLowerCase()
+}
diff --git a/packages/ui/src/components/sharing/invite-players-modal/use-invite-players-search.ts b/packages/ui/src/components/sharing/invite-players-modal/use-invite-players-search.ts
new file mode 100644
index 000000000..6e4b395d1
--- /dev/null
+++ b/packages/ui/src/components/sharing/invite-players-modal/use-invite-players-search.ts
@@ -0,0 +1,226 @@
+import { useDebounceFn } from '@vueuse/core'
+import { computed, type MaybeRefOrGetter, ref, toValue, watch } from 'vue'
+
+import type { ComboboxOption } from '../../base/Combobox.vue'
+import {
+	type InvitePlayersInvitePayload,
+	type InvitePlayersSearchUser,
+	type InvitePlayersUser,
+	type InvitePlayersUserStatus,
+	normalizeInviteKey,
+} from './types'
+
+export function useInvitePlayersSearch(options: {
+	friends: MaybeRefOrGetter<InvitePlayersUser[]>
+	suggestions: MaybeRefOrGetter<InvitePlayersSearchUser[]>
+	searchUsers: MaybeRefOrGetter<((query: string) => Promise<InvitePlayersSearchUser[]>) | undefined>
+	canInvite: MaybeRefOrGetter<boolean>
+	inviteDisabledMessage: MaybeRefOrGetter<string>
+	alreadyInvitedMessage: MaybeRefOrGetter<string>
+	searchingMessage: MaybeRefOrGetter<string>
+	noResultsMessage: MaybeRefOrGetter<string>
+	onInvite: (payload: InvitePlayersInvitePayload) => void
+}) {
+	const searchTarget = ref('')
+	const searchInputKey = ref(0)
+	const selectedSearchUser = ref<InvitePlayersSearchUser | null>(null)
+	const remoteSearchUsers = ref<InvitePlayersSearchUser[]>([])
+	const searchLookupStatus = ref<'idle' | 'loading' | 'loaded'>('idle')
+	const searchLookupRequestId = ref(0)
+	const friendOrder = ref(new Map<string, number>())
+	const searchMinimumLength = 1
+	const passwordManagerIgnoreAttrs = {
+		'data-1p-ignore': 'true',
+		'data-bwignore': 'true',
+		'data-form-type': 'other',
+		'data-lpignore': 'true',
+		'data-protonpass-ignore': 'true',
+	}
+	const normalizedSearchTarget = computed(() => searchTarget.value.trim())
+	const usesRemoteSearch = computed(() => !!toValue(options.searchUsers))
+	const searchLookupMessage = computed(() =>
+		usesRemoteSearch.value && searchLookupStatus.value !== 'loaded'
+			? toValue(options.searchingMessage)
+			: toValue(options.noResultsMessage),
+	)
+	const searchableUsers = computed(() => {
+		const users = new Map<string, InvitePlayersSearchUser>()
+		for (const user of [...remoteSearchUsers.value, ...toValue(options.suggestions)]) {
+			users.set(normalizeInviteKey(user.id), user)
+			users.set(normalizeInviteKey(user.username), user)
+			if (user.email) users.set(normalizeInviteKey(user.email), user)
+		}
+		return [...new Set(users.values())]
+	})
+	const searchOptions = computed<ComboboxOption<string>[]>(() =>
+		searchableUsers.value.map((user) => ({
+			value: user.username,
+			label: user.username,
+			searchTerms: [user.username, user.id, user.email].filter(Boolean) as string[],
+		})),
+	)
+	const sortedFriends = computed(() =>
+		toValue(options.friends)
+			.map((friend, index) => ({
+				friend,
+				order: friendOrder.value.get(friend.id) ?? friendOrder.value.size + index,
+			}))
+			.sort((a, b) => a.order - b.order)
+			.map(({ friend }) => friend),
+	)
+
+	function findSearchUser(value: string) {
+		const normalizedValue = normalizeInviteKey(value)
+		return searchableUsers.value.find(
+			(user) =>
+				normalizeInviteKey(user.username) === normalizedValue ||
+				normalizeInviteKey(user.id) === normalizedValue ||
+				(!!user.email && normalizeInviteKey(user.email) === normalizedValue),
+		)
+	}
+
+	const matchedSearchUser = computed(() => {
+		if (
+			selectedSearchUser.value &&
+			normalizeInviteKey(selectedSearchUser.value.username) ===
+				normalizeInviteKey(normalizedSearchTarget.value)
+		) {
+			return selectedSearchUser.value
+		}
+		return findSearchUser(normalizedSearchTarget.value)
+	})
+	const invitedUserKeys = computed(() => {
+		const keys = new Set<string>()
+		for (const friend of toValue(options.friends)) {
+			if (friendStatus(friend) === 'available') continue
+			keys.add(normalizeInviteKey(friend.id))
+			keys.add(normalizeInviteKey(friend.username))
+		}
+		return keys
+	})
+	const searchTargetAlreadyInvited = computed(() => {
+		const user = matchedSearchUser.value
+		if (!user) return false
+		return (
+			invitedUserKeys.value.has(normalizeInviteKey(user.id)) ||
+			invitedUserKeys.value.has(normalizeInviteKey(user.username))
+		)
+	})
+	const canInviteSearchTarget = computed(
+		() =>
+			toValue(options.canInvite) &&
+			normalizedSearchTarget.value.length >= searchMinimumLength &&
+			!!matchedSearchUser.value &&
+			!searchTargetAlreadyInvited.value &&
+			(!usesRemoteSearch.value ||
+				searchLookupStatus.value === 'loaded' ||
+				!!selectedSearchUser.value),
+	)
+	const searchInviteTooltip = computed(() => {
+		if (!toValue(options.canInvite)) return toValue(options.inviteDisabledMessage)
+		if (searchTargetAlreadyInvited.value) return toValue(options.alreadyInvitedMessage)
+		return undefined
+	})
+
+	const searchTargetUsers = useDebounceFn(async (query: string, requestId: number) => {
+		const searchUsers = toValue(options.searchUsers)
+		if (!searchUsers) return
+		try {
+			const users = await searchUsers(query)
+			if (requestId !== searchLookupRequestId.value || query !== normalizedSearchTarget.value)
+				return
+			remoteSearchUsers.value = users
+		} catch {
+			if (requestId !== searchLookupRequestId.value || query !== normalizedSearchTarget.value)
+				return
+			remoteSearchUsers.value = []
+		} finally {
+			if (requestId === searchLookupRequestId.value && query === normalizedSearchTarget.value) {
+				searchLookupStatus.value = 'loaded'
+			}
+		}
+	}, 250)
+
+	function friendStatus(friend: InvitePlayersUser): InvitePlayersUserStatus {
+		return friend.status ?? 'available'
+	}
+
+	function syncFriendOrder(friends: InvitePlayersUser[]) {
+		const nextOrder = new Map(friendOrder.value)
+		let nextIndex = nextOrder.size
+		const unorderedFriends = friends.filter((friend) => !nextOrder.has(friend.id))
+		if (unorderedFriends.length === 0) return
+		for (const friend of unorderedFriends) {
+			nextOrder.set(friend.id, nextIndex)
+			nextIndex += 1
+		}
+		friendOrder.value = nextOrder
+	}
+
+	function handleSearchInput(value: string) {
+		searchTarget.value = value
+		selectedSearchUser.value = null
+		remoteSearchUsers.value = []
+		searchLookupRequestId.value += 1
+		if (normalizedSearchTarget.value.length < searchMinimumLength) {
+			searchLookupStatus.value = 'idle'
+			return
+		}
+		if (!usesRemoteSearch.value) {
+			searchLookupStatus.value = 'loaded'
+			return
+		}
+		searchLookupStatus.value = 'loading'
+		void searchTargetUsers(normalizedSearchTarget.value, searchLookupRequestId.value)
+	}
+
+	function handleSearchSelect(option: ComboboxOption<string>) {
+		searchTarget.value = option.value
+		selectedSearchUser.value = findSearchUser(option.value) ?? null
+		searchLookupStatus.value = 'loaded'
+	}
+
+	function resetSearch() {
+		searchTarget.value = ''
+		searchInputKey.value += 1
+		selectedSearchUser.value = null
+		remoteSearchUsers.value = []
+		searchLookupStatus.value = 'idle'
+		searchLookupRequestId.value += 1
+	}
+
+	function inviteSearchTarget() {
+		if (!canInviteSearchTarget.value) return
+		const user = matchedSearchUser.value
+		if (!user) return
+		options.onInvite({
+			user: {
+				id: user.id,
+				username: user.username,
+				avatarUrl: user.avatarUrl,
+			},
+			source: 'search',
+		})
+		resetSearch()
+	}
+
+	watch(() => toValue(options.friends), syncFriendOrder, { immediate: true })
+
+	return {
+		searchTarget,
+		searchInputKey,
+		searchOptions,
+		searchLookupMessage,
+		searchMinimumLength,
+		usesRemoteSearch,
+		passwordManagerIgnoreAttrs,
+		sortedFriends,
+		canInviteSearchTarget,
+		searchInviteTooltip,
+		findSearchUser,
+		handleSearchInput,
+		handleSearchSelect,
+		inviteSearchTarget,
+		resetSearch,
+	}
+}
diff --git a/packages/ui/src/layouts/shared/browse-tab/layout.vue b/packages/ui/src/layouts/shared/browse-tab/layout.vue
index 326f2da1e..3252bf739 100644
--- a/packages/ui/src/layouts/shared/browse-tab/layout.vue
+++ b/packages/ui/src/layouts/shared/browse-tab/layout.vue
@@ -99,7 +99,7 @@ function getProjectCardTags(result: Labrinth.Search.v3.ResultSearchProject, disp
 	<template v-if="ctx.installContext?.value && ctx.variant !== 'web'">
 		<div
 			ref="stickyInstallHeaderRef"
-			class="sticky top-0 z-20 -mx-6 -mt-6 rounded-tl-[--radius-xl] border-0 border-b border-solid bg-surface-1 p-3 border-surface-5"
+			class="sticky top-0 z-20 -mx-6 -mt-6 rounded-tl-[--radius-xl] border-0 border-b border-solid bg-surface-1 px-3 py-4 border-surface-5"
 			:class="[isInstallHeaderStuck ? 'border-t' : '']"
 		>
 			<BrowseInstallHeader />
diff --git a/packages/ui/src/layouts/shared/content-tab/components/ContentCardTable.vue b/packages/ui/src/layouts/shared/content-tab/components/ContentCardTable.vue
index 1da88cf50..d9bb58615 100644
--- a/packages/ui/src/layouts/shared/content-tab/components/ContentCardTable.vue
+++ b/packages/ui/src/layouts/shared/content-tab/components/ContentCardTable.vue
@@ -27,6 +27,7 @@ interface Props {
 	hideDelete?: boolean
 	hideHeader?: boolean
 	flat?: boolean
+	showItemActions?: boolean
 }
 
 const props = withDefaults(defineProps<Props>(), {
@@ -38,6 +39,7 @@ const props = withDefaults(defineProps<Props>(), {
 	hideDelete: false,
 	hideHeader: false,
 	flat: false,
+	showItemActions: false,
 })
 
 const stickyHeaderRef = ref<HTMLElement | null>(null)
@@ -67,7 +69,8 @@ const hasEnabledListener = computed(
 const hasAnyActions = computed(() => {
 	// Check if there are listeners for actions
 	const hasListeners =
-		(hasDeleteListener.value && !props.hideDelete) ||
+		(hasDeleteListener.value &&
+			props.items.some((item) => !props.hideDelete && !item.hideDelete)) ||
 		hasUpdateListener.value ||
 		hasSwitchVersionListener.value ||
 		hasEnabledListener.value
@@ -80,7 +83,7 @@ const hasAnyActions = computed(() => {
 			item.enabled !== undefined,
 	)
 
-	return hasListeners || hasItemActions
+	return hasListeners || hasItemActions || props.showItemActions
 })
 
 // Virtualization
@@ -273,7 +276,7 @@ function handleSort(column: ContentCardTableSortColumn) {
 					:toggle-disabled="item.toggleDisabled"
 					:toggle-disabled-tooltip="item.toggleDisabledTooltip"
 					:show-checkbox="showSelection"
-					:hide-delete="hideDelete"
+					:hide-delete="hideDelete || item.hideDelete"
 					:hide-actions="!hasAnyActions"
 					:selected="isItemSelected(item.id)"
 					:class="[
@@ -296,6 +299,9 @@ function handleSort(column: ContentCardTableSortColumn) {
 						hasSwitchVersionListener ? { switchVersion: () => emit('switchVersion', item.id) } : {}
 					"
 				>
+					<template #title-badges>
+						<slot name="itemTitleBadges" :item="item" :index="visibleRange.start + idx" />
+					</template>
 					<template #additionalButtonsLeft>
 						<slot name="itemButtonsLeft" :item="item" :index="visibleRange.start + idx" />
 					</template>
@@ -326,13 +332,14 @@ function handleSort(column: ContentCardTableSortColumn) {
 				:has-update="item.hasUpdate"
 				:is-client-only="item.isClientOnly"
 				:client-warning="item.clientWarning"
+				:hide-switch-version="item.hideSwitchVersion"
 				:overflow-options="item.overflowOptions"
 				:disabled="item.disabled"
 				:disabled-tooltip="item.disabledTooltip"
 				:toggle-disabled="item.toggleDisabled"
 				:toggle-disabled-tooltip="item.toggleDisabledTooltip"
 				:show-checkbox="showSelection"
-				:hide-delete="hideDelete"
+				:hide-delete="hideDelete || item.hideDelete"
 				:hide-actions="!hasAnyActions"
 				:selected="isItemSelected(item.id)"
 				:class="[
@@ -350,6 +357,9 @@ function handleSort(column: ContentCardTableSortColumn) {
 				@update="emit('update', item.id)"
 				@switch-version="emit('switchVersion', item.id)"
 			>
+				<template #title-badges>
+					<slot name="itemTitleBadges" :item="item" :index="index" />
+				</template>
 				<template #additionalButtonsLeft>
 					<slot name="itemButtonsLeft" :item="item" :index="index" />
 				</template>
diff --git a/packages/ui/src/layouts/shared/content-tab/components/ContentModpackCard.vue b/packages/ui/src/layouts/shared/content-tab/components/ContentModpackCard.vue
index b77ee8ce0..c4af24241 100644
--- a/packages/ui/src/layouts/shared/content-tab/components/ContentModpackCard.vue
+++ b/packages/ui/src/layouts/shared/content-tab/components/ContentModpackCard.vue
@@ -7,9 +7,7 @@ import {
 	MoreVerticalIcon,
 	Settings2Icon,
 	SpinnerIcon,
-	XIcon,
 } from '@modrinth/assets'
-import { Tooltip } from 'floating-vue'
 import { computed, getCurrentInstance, onMounted, onUnmounted, ref } from 'vue'
 import type { RouteLocationRaw } from 'vue-router'
 
@@ -23,7 +21,7 @@ import OverflowMenu, {
 import TagTagItem from '#ui/components/base/TagTagItem.vue'
 import TeleportOverflowMenu from '#ui/components/base/TeleportOverflowMenu.vue'
 import { useRelativeTime } from '#ui/composables/how-ago'
-import { defineMessages, useVIntl } from '#ui/composables/i18n'
+import { useVIntl } from '#ui/composables/i18n'
 import { commonMessages } from '#ui/utils/common-messages'
 
 import type {
@@ -35,21 +33,6 @@ import type {
 
 const { formatMessage } = useVIntl()
 
-const messages = defineMessages({
-	contentHintTitle: {
-		id: 'content.modpack-card.content-hint-title',
-		defaultMessage: 'Modpack content moved',
-	},
-	contentHintDescription: {
-		id: 'content.modpack-card.content-hint-description',
-		defaultMessage: "Your modpack's content can now be found here!",
-	},
-	dismissHint: {
-		id: 'content.modpack-card.dismiss-hint',
-		defaultMessage: "Don't show again",
-	},
-})
-
 interface Props {
 	project: ContentModpackCardProject
 	projectLink?: string | RouteLocationRaw
@@ -61,7 +44,6 @@ interface Props {
 	overflowOptions?: OverflowMenuOption[]
 	hasUpdate?: boolean
 	disabledText?: string
-	showContentHint?: boolean
 }
 
 withDefaults(defineProps<Props>(), {
@@ -74,14 +56,12 @@ withDefaults(defineProps<Props>(), {
 	overflowOptions: undefined,
 	hasUpdate: false,
 	disabledText: undefined,
-	showContentHint: false,
 })
 
 const emit = defineEmits<{
 	update: []
 	content: []
 	settings: []
-	'dismiss-content-hint': []
 }>()
 
 const instance = getCurrentInstance()
@@ -143,7 +123,7 @@ onUnmounted(() => {
 		<div class="flex flex-wrap items-start justify-between gap-4">
 			<div class="flex min-w-0 flex-1 items-center gap-4">
 				<AutoLink :to="projectLink" class="shrink-0">
-					<Avatar :src="project.icon_url" :alt="project.title" size="5rem" no-shadow raised />
+					<Avatar :src="project.icon_url" :alt="project.title" size="5rem" no-shadow />
 				</AutoLink>
 				<div class="flex min-w-0 flex-col gap-1.5">
 					<div class="flex min-w-0 flex-col">
@@ -230,60 +210,15 @@ onUnmounted(() => {
 							</button>
 						</ButtonStyled>
 
-						<Tooltip
-							v-if="hasContentListener"
-							theme="dismissable-prompt"
-							class="inline-flex"
-							:triggers="[]"
-							:shown="showContentHint && isExpanded"
-							:auto-hide="false"
-							placement="bottom-end"
-						>
-							<ButtonStyled>
-								<button
-									class="!shadow-none"
-									@click="
-										() => {
-											emit('content')
-											emit('dismiss-content-hint')
-										}
-									"
-								>
-									<BoxesIcon />
-									{{ formatMessage(commonMessages.contentLabel) }}
-								</button>
-							</ButtonStyled>
-							<template #popper>
-								<div class="grid grid-cols-[min-content] gap-1">
-									<div class="flex min-w-48 items-center justify-between gap-8">
-										<h3 class="m-0 whitespace-nowrap text-base font-bold text-contrast">
-											{{ formatMessage(messages.contentHintTitle) }}
-										</h3>
-										<ButtonStyled size="small" circular>
-											<button
-												v-tooltip="formatMessage(messages.dismissHint)"
-												@click="emit('dismiss-content-hint')"
-											>
-												<XIcon aria-hidden="true" />
-											</button>
-										</ButtonStyled>
-									</div>
-									<p class="m-0 text-wrap text-sm font-medium leading-tight text-secondary">
-										{{ formatMessage(messages.contentHintDescription) }}
-									</p>
-								</div>
-							</template>
-						</Tooltip>
+						<ButtonStyled v-if="hasContentListener">
+							<button class="!shadow-none" @click="emit('content')">
+								<BoxesIcon />
+								{{ formatMessage(commonMessages.contentLabel) }}
+							</button>
+						</ButtonStyled>
 
 						<ButtonStyled v-if="hasSettingsListener" type="outlined" circular>
-							<button
-								@click="
-									() => {
-										emit('settings')
-										emit('dismiss-content-hint')
-									}
-								"
-							>
+							<button @click="emit('settings')">
 								<Settings2Icon />
 							</button>
 						</ButtonStyled>
@@ -300,53 +235,19 @@ onUnmounted(() => {
 							</button>
 						</ButtonStyled>
 					</div>
-					<Tooltip
-						v-if="collapsedOptions.length"
-						theme="dismissable-prompt"
-						class="inline-flex"
-						:triggers="[]"
-						:shown="showContentHint && !isExpanded"
-						:auto-hide="false"
-						placement="bottom-end"
-					>
-						<ButtonStyled circular type="outlined"
-							><TeleportOverflowMenu
-								:options="collapsedOptions"
-								class="flex @[700px]:hidden"
-								@open="emit('dismiss-content-hint')"
-							>
-								<MoreVerticalIcon class="size-5" />
-								<template #content>
-									<BoxesIcon class="size-5" />
-									{{ formatMessage(commonMessages.contentLabel) }}
-								</template>
-								<template #settings>
-									<Settings2Icon class="size-5" />
-									{{ formatMessage(commonMessages.settingsLabel) }}
-								</template>
-							</TeleportOverflowMenu></ButtonStyled
-						>
-						<template #popper>
-							<div class="grid grid-cols-[min-content] gap-1">
-								<div class="flex min-w-48 items-center justify-between gap-8">
-									<h3 class="m-0 whitespace-nowrap text-base font-bold text-contrast">
-										{{ formatMessage(messages.contentHintTitle) }}
-									</h3>
-									<ButtonStyled size="small" circular>
-										<button
-											v-tooltip="formatMessage(messages.dismissHint)"
-											@click="emit('dismiss-content-hint')"
-										>
-											<XIcon aria-hidden="true" />
-										</button>
-									</ButtonStyled>
-								</div>
-								<p class="m-0 text-wrap text-sm font-medium leading-tight text-secondary">
-									{{ formatMessage(messages.contentHintDescription) }}
-								</p>
-							</div>
-						</template>
-					</Tooltip>
+					<ButtonStyled v-if="collapsedOptions.length" circular type="outlined">
+						<TeleportOverflowMenu :options="collapsedOptions" class="flex @[700px]:hidden">
+							<MoreVerticalIcon class="size-5" />
+							<template #content>
+								<BoxesIcon class="size-5" />
+								{{ formatMessage(commonMessages.contentLabel) }}
+							</template>
+							<template #settings>
+								<Settings2Icon class="size-5" />
+								{{ formatMessage(commonMessages.settingsLabel) }}
+							</template>
+						</TeleportOverflowMenu>
+					</ButtonStyled>
 
 					<ButtonStyled
 						v-if="overflowOptions?.length"
diff --git a/packages/ui/src/layouts/shared/content-tab/components/ContentSelectionBar.vue b/packages/ui/src/layouts/shared/content-tab/components/ContentSelectionBar.vue
index f5c6d52bc..d2693db24 100644
--- a/packages/ui/src/layouts/shared/content-tab/components/ContentSelectionBar.vue
+++ b/packages/ui/src/layouts/shared/content-tab/components/ContentSelectionBar.vue
@@ -94,6 +94,7 @@ interface Props {
 	bulkItemCount?: number
 	ariaLabel?: string
 	getItemId?: (item: ContentItem) => string
+	toggleItems?: ContentItem[]
 }
 
 const props = withDefaults(defineProps<Props>(), {
@@ -109,6 +110,7 @@ const props = withDefaults(defineProps<Props>(), {
 	bulkItemCount: 0,
 	ariaLabel: undefined,
 	getItemId: undefined,
+	toggleItems: undefined,
 })
 
 const emit = defineEmits<{
@@ -130,8 +132,10 @@ function resolveItemId(item: ContentItem) {
 	return props.getItemId?.(item) ?? item.file_path ?? item.file_name ?? item.id
 }
 
-const allDisabled = computed(() => props.selectedItems.every((m) => !m.enabled))
-const allEnabled = computed(() => props.selectedItems.every((m) => m.enabled))
+const toggleActionItems = computed(() => props.toggleItems ?? props.selectedItems)
+const hasToggleActions = computed(() => toggleActionItems.value.length > 0)
+const allDisabled = computed(() => toggleActionItems.value.every((m) => !m.enabled))
+const allEnabled = computed(() => toggleActionItems.value.every((m) => m.enabled))
 
 const selectedCountText = computed(() => {
 	const count = props.isBulkOperating
@@ -231,7 +235,7 @@ const bulkProgressMessage = computed(() => {
 		<div v-if="!isBulkOperating" class="ml-auto flex items-center gap-0.5">
 			<slot name="actions" />
 
-			<ButtonStyled type="transparent">
+			<ButtonStyled v-if="hasToggleActions" type="transparent">
 				<button
 					v-tooltip="
 						isBusy && busyTooltip
@@ -247,7 +251,7 @@ const bulkProgressMessage = computed(() => {
 					<span class="bar-label">{{ formatMessage(commonMessages.enableButton) }}</span>
 				</button>
 			</ButtonStyled>
-			<ButtonStyled type="transparent">
+			<ButtonStyled v-if="hasToggleActions" type="transparent">
 				<button
 					v-tooltip="
 						isBusy && busyTooltip
diff --git a/packages/ui/src/layouts/shared/content-tab/components/modals/ConfirmDeletionModal.vue b/packages/ui/src/layouts/shared/content-tab/components/modals/ConfirmDeletionModal.vue
index d3b6118ef..77317e4c8 100644
--- a/packages/ui/src/layouts/shared/content-tab/components/modals/ConfirmDeletionModal.vue
+++ b/packages/ui/src/layouts/shared/content-tab/components/modals/ConfirmDeletionModal.vue
@@ -11,8 +11,8 @@
 		:on-hide="() => backupCreator?.cancelBackup()"
 	>
 		<div class="flex flex-col gap-6">
-			<Admonition type="warning" :header="formatMessage(messages.admonitionHeader)">
-				{{ formatMessage(messages.admonitionBody) }}
+			<Admonition type="warning" :header="admonitionHeader">
+				{{ admonitionBody }}
 			</Admonition>
 			<InlineBackupCreator
 				ref="backupCreator"
@@ -36,12 +36,7 @@
 						@click="confirm"
 					>
 						<TrashIcon />
-						{{
-							formatMessage(messages.deleteButton, {
-								count: visibleCount,
-								itemType: formatContentTypeSentence(formatMessage, visibleItemType, visibleCount),
-							})
-						}}
+						{{ deleteButtonLabel }}
 					</button>
 				</ButtonStyled>
 			</div>
@@ -51,7 +46,7 @@
 
 <script setup lang="ts">
 import { TrashIcon, XIcon } from '@modrinth/assets'
-import { nextTick, ref } from 'vue'
+import { computed, nextTick, ref } from 'vue'
 
 import Admonition from '#ui/components/base/Admonition.vue'
 import ButtonStyled from '#ui/components/base/ButtonStyled.vue'
@@ -59,6 +54,7 @@ import NewModal from '#ui/components/modal/NewModal.vue'
 import { defineMessages, useVIntl } from '#ui/composables/i18n'
 import { commonMessages, formatContentTypeSentence } from '#ui/utils/common-messages'
 
+import type { ContentActionWarning } from '../../types'
 import InlineBackupCreator from './InlineBackupCreator.vue'
 
 const { formatMessage } = useVIntl()
@@ -87,12 +83,14 @@ const props = withDefaults(
 	defineProps<{
 		count: number
 		itemType: string
+		warning?: ContentActionWarning | null
 		variant?: 'instance' | 'server'
 		backupTip?: string
 		actionDisabled?: boolean
 		actionDisabledTooltip?: string
 	}>(),
 	{
+		warning: null,
 		variant: 'instance',
 		backupTip: undefined,
 		actionDisabled: false,
@@ -109,11 +107,35 @@ const backupCreator = ref<InstanceType<typeof InlineBackupCreator>>()
 const buttonsDisabled = ref(false)
 const visibleCount = ref(props.count)
 const visibleItemType = ref(props.itemType)
+const visibleWarning = ref(props.warning)
+
+const formattedItemType = computed(() =>
+	formatContentTypeSentence(formatMessage, visibleItemType.value, visibleCount.value),
+)
+
+const admonitionHeader = computed(
+	() => visibleWarning.value?.admonitionHeader ?? formatMessage(messages.admonitionHeader),
+)
+
+const admonitionBody = computed(() => {
+	return visibleWarning.value?.admonitionBody ?? formatMessage(messages.admonitionBody)
+})
+
+const deleteButtonLabel = computed(() => {
+	return (
+		visibleWarning.value?.actionLabel ??
+		formatMessage(messages.deleteButton, {
+			count: visibleCount.value,
+			itemType: formattedItemType.value,
+		})
+	)
+})
 
 async function show() {
 	await nextTick()
 	visibleCount.value = props.count
 	visibleItemType.value = props.itemType
+	visibleWarning.value = props.warning
 	modal.value?.show()
 }
 
diff --git a/packages/ui/src/layouts/shared/content-tab/components/modals/ConfirmDisableModal.vue b/packages/ui/src/layouts/shared/content-tab/components/modals/ConfirmDisableModal.vue
new file mode 100644
index 000000000..dc1d76df7
--- /dev/null
+++ b/packages/ui/src/layouts/shared/content-tab/components/modals/ConfirmDisableModal.vue
@@ -0,0 +1,103 @@
+<template>
+	<NewModal
+		ref="modal"
+		:header="
+			formatMessage(messages.header, {
+				itemType: formatContentTypeSentence(formatMessage, visibleItemType, visibleCount),
+			})
+		"
+		fade="warning"
+		max-width="500px"
+	>
+		<div class="flex flex-col gap-6">
+			<Admonition type="warning" :header="visibleWarning?.admonitionHeader ?? ''">
+				{{ visibleWarning?.admonitionBody }}
+			</Admonition>
+		</div>
+
+		<template #actions>
+			<div class="flex gap-2 justify-end">
+				<ButtonStyled type="outlined">
+					<button @click="modal?.hide()">
+						<XIcon />
+						{{ formatMessage(commonMessages.cancelButton) }}
+					</button>
+				</ButtonStyled>
+				<ButtonStyled color="orange">
+					<button
+						v-tooltip="props.actionDisabled ? props.actionDisabledTooltip : undefined"
+						:disabled="props.actionDisabled"
+						@click="confirm"
+					>
+						<SlashIcon />
+						{{ visibleWarning?.actionLabel }}
+					</button>
+				</ButtonStyled>
+			</div>
+		</template>
+	</NewModal>
+</template>
+
+<script setup lang="ts">
+import { SlashIcon, XIcon } from '@modrinth/assets'
+import { nextTick, ref } from 'vue'
+
+import Admonition from '#ui/components/base/Admonition.vue'
+import ButtonStyled from '#ui/components/base/ButtonStyled.vue'
+import NewModal from '#ui/components/modal/NewModal.vue'
+import { defineMessages, useVIntl } from '#ui/composables/i18n'
+import { commonMessages, formatContentTypeSentence } from '#ui/utils/common-messages'
+
+import type { ContentActionWarning } from '../../types'
+
+const { formatMessage } = useVIntl()
+
+const messages = defineMessages({
+	header: {
+		id: 'content.confirm-disable.header',
+		defaultMessage: 'Disable {itemType}',
+	},
+})
+
+const props = withDefaults(
+	defineProps<{
+		count: number
+		itemType: string
+		warning?: ContentActionWarning | null
+		actionDisabled?: boolean
+		actionDisabledTooltip?: string
+	}>(),
+	{
+		actionDisabled: false,
+		actionDisabledTooltip: undefined,
+		warning: null,
+	},
+)
+
+const emit = defineEmits<{
+	(e: 'disable'): void
+}>()
+
+const modal = ref<InstanceType<typeof NewModal>>()
+const visibleCount = ref(props.count)
+const visibleItemType = ref(props.itemType)
+const visibleWarning = ref(props.warning)
+
+async function show() {
+	await nextTick()
+	visibleCount.value = props.count
+	visibleItemType.value = props.itemType
+	visibleWarning.value = props.warning
+	modal.value?.show()
+}
+
+function confirm() {
+	if (props.actionDisabled) return
+	modal.value?.hide()
+	emit('disable')
+}
+
+defineExpose({
+	show,
+})
+</script>
diff --git a/packages/ui/src/layouts/shared/content-tab/components/modals/ConfirmModpackUpdateModal.vue b/packages/ui/src/layouts/shared/content-tab/components/modals/ConfirmModpackUpdateModal.vue
index ffe36eda5..a0ab73bad 100644
--- a/packages/ui/src/layouts/shared/content-tab/components/modals/ConfirmModpackUpdateModal.vue
+++ b/packages/ui/src/layouts/shared/content-tab/components/modals/ConfirmModpackUpdateModal.vue
@@ -19,6 +19,9 @@
 					})
 				}}
 			</Admonition>
+			<Admonition v-if="managedWarning" type="warning" :header="managedWarning.header">
+				{{ managedWarning.body }}
+			</Admonition>
 			<InlineBackupCreator
 				ref="backupCreator"
 				:backup-name="backupName"
@@ -65,6 +68,7 @@ import InlineBackupCreator from './InlineBackupCreator.vue'
 
 const props = defineProps<{
 	downgrade?: boolean
+	managedWarning?: { header: string; body: string } | null
 	backupTip?: string
 	actionDisabled?: boolean
 	actionDisabledTooltip?: string
diff --git a/packages/ui/src/layouts/shared/content-tab/components/modals/ConfirmUnlinkModal.vue b/packages/ui/src/layouts/shared/content-tab/components/modals/ConfirmUnlinkModal.vue
index 6d31307e4..9497d880c 100644
--- a/packages/ui/src/layouts/shared/content-tab/components/modals/ConfirmUnlinkModal.vue
+++ b/packages/ui/src/layouts/shared/content-tab/components/modals/ConfirmUnlinkModal.vue
@@ -1,14 +1,14 @@
 <template>
 	<NewModal
 		ref="modal"
-		:header="formatMessage(messages.header)"
+		:header="props.header ?? formatMessage(messages.header)"
 		fade="warning"
 		max-width="500px"
 		:on-hide="() => backupCreator?.cancelBackup()"
 	>
 		<div class="flex flex-col gap-6">
-			<Admonition type="warning" :header="formatMessage(messages.admonitionHeader)">
-				{{ formatMessage(messages.admonitionBody) }}
+			<Admonition type="warning" :header="admonitionHeader">
+				{{ admonitionBody }}
 			</Admonition>
 			<InlineBackupCreator
 				ref="backupCreator"
@@ -32,7 +32,7 @@
 						@click="confirm"
 					>
 						<UnlinkIcon />
-						{{ formatMessage(props.server ? messages.header : messages.unlinkButton) }}
+						{{ formatMessage(actionMessage) }}
 					</button>
 				</ButtonStyled>
 			</div>
@@ -42,7 +42,7 @@
 
 <script setup lang="ts">
 import { UnlinkIcon, XIcon } from '@modrinth/assets'
-import { ref } from 'vue'
+import { computed, ref } from 'vue'
 
 import Admonition from '#ui/components/base/Admonition.vue'
 import ButtonStyled from '#ui/components/base/ButtonStyled.vue'
@@ -54,6 +54,8 @@ import { commonMessages } from '#ui/utils/common-messages'
 import InlineBackupCreator from './InlineBackupCreator.vue'
 
 const props = defineProps<{
+	header?: string
+	warning?: { header: string; body: string } | null
 	server?: boolean
 	backupTip?: string
 	actionDisabled?: boolean
@@ -90,6 +92,15 @@ const emit = defineEmits<{
 const modal = ref<InstanceType<typeof NewModal>>()
 const backupCreator = ref<InstanceType<typeof InlineBackupCreator>>()
 const buttonsDisabled = ref(false)
+const admonitionHeader = computed(() => {
+	if (props.warning) return props.warning.header
+	return formatMessage(messages.admonitionHeader)
+})
+const admonitionBody = computed(() => {
+	if (props.warning) return props.warning.body
+	return formatMessage(messages.admonitionBody)
+})
+const actionMessage = computed(() => (props.server ? messages.header : messages.unlinkButton))
 
 function show() {
 	debug('show: called', {
diff --git a/packages/ui/src/layouts/shared/content-tab/components/modals/ModpackContentModal.vue b/packages/ui/src/layouts/shared/content-tab/components/modals/ModpackContentModal.vue
index 67a81e69e..e98b6f5a0 100644
--- a/packages/ui/src/layouts/shared/content-tab/components/modals/ModpackContentModal.vue
+++ b/packages/ui/src/layouts/shared/content-tab/components/modals/ModpackContentModal.vue
@@ -2,6 +2,7 @@
 import {
 	ArrowLeftRightIcon,
 	BoxIcon,
+	ExternalIcon,
 	FilterIcon,
 	GlassesIcon,
 	PaintbrushIcon,
@@ -13,6 +14,7 @@ import { computed, nextTick, ref, watchSyncEffect } from 'vue'
 
 import Avatar from '#ui/components/base/Avatar.vue'
 import BulletDivider from '#ui/components/base/BulletDivider.vue'
+import ButtonStyled from '#ui/components/base/ButtonStyled.vue'
 import Checkbox from '#ui/components/base/Checkbox.vue'
 import type { Option as OverflowMenuOption } from '#ui/components/base/OverflowMenu.vue'
 import StyledInput from '#ui/components/base/StyledInput.vue'
@@ -33,6 +35,7 @@ import ContentSelectionBar from '../ContentSelectionBar.vue'
 const { formatMessage } = useVIntl()
 
 interface Props {
+	header?: string
 	modpackName?: string
 	modpackIconUrl?: string
 	enableToggle?: boolean
@@ -43,6 +46,7 @@ interface Props {
 }
 
 const props = withDefaults(defineProps<Props>(), {
+	header: undefined,
 	modpackName: undefined,
 	modpackIconUrl: undefined,
 	enableToggle: false,
@@ -84,6 +88,18 @@ const messages = defineMessages({
 		id: 'instances.modpack-content-modal.no-results',
 		defaultMessage: 'No projects match your search.',
 	},
+	externalContent: {
+		id: 'instances.modpack-content-modal.external-content',
+		defaultMessage: 'External',
+	},
+	externalContentDescription: {
+		id: 'instances.modpack-content-modal.external-content-description',
+		defaultMessage: 'This file is not published on Modrinth.',
+	},
+	openInSlicer: {
+		id: 'instances.modpack-content-modal.open-in-slicer',
+		defaultMessage: 'Open in Slicer',
+	},
 })
 
 export interface ModpackContentModalState {
@@ -104,18 +120,17 @@ const selectedFilters = ref<string[]>([])
 const selectedIds = ref<string[]>([])
 
 const selectedItems = computed(() =>
-	items.value.filter((item) => selectedIds.value.includes(item.file_name)),
+	items.value.filter((item) => selectedIds.value.includes(item.id)),
 )
 
 const allSelected = computed(() => {
 	if (filteredItems.value.length === 0) return false
-	return filteredItems.value.every((item) => selectedIds.value.includes(item.file_name))
+	return filteredItems.value.every((item) => selectedIds.value.includes(item.id))
 })
 
 const someSelected = computed(() => {
 	return (
-		filteredItems.value.some((item) => selectedIds.value.includes(item.file_name)) &&
-		!allSelected.value
+		filteredItems.value.some((item) => selectedIds.value.includes(item.id)) && !allSelected.value
 	)
 })
 
@@ -123,7 +138,7 @@ function toggleSelectAll() {
 	if (allSelected.value || someSelected.value) {
 		selectedIds.value = []
 	} else {
-		selectedIds.value = filteredItems.value.map((item) => item.file_name)
+		selectedIds.value = filteredItems.value.map((item) => item.id)
 	}
 }
 
@@ -160,7 +175,7 @@ const filterOptions = computed(() => {
 		options.push({ id: 'warnings', label: 'Warnings' })
 	}
 
-	if (items.value.some((item) => !item.enabled)) {
+	if (props.enableToggle && items.value.some((item) => item.enabled === false)) {
 		options.push({ id: 'disabled', label: 'Disabled' })
 	}
 
@@ -190,7 +205,7 @@ const attributeFilterIds = new Set(['disabled', 'warnings'])
 const typeFilteredCount = computed(() => {
 	if (selectedFilters.value.length === 0) return items.value.length
 	const typeFilters = selectedFilters.value.filter((f) => !attributeFilterIds.has(f))
-	const hasDisabledFilter = selectedFilters.value.includes('disabled')
+	const hasDisabledFilter = props.enableToggle && selectedFilters.value.includes('disabled')
 	const hasWarningsFilter = selectedFilters.value.includes('warnings')
 	return items.value.filter((item) => {
 		if (typeFilters.length > 0 && !typeFilters.includes(normalizeProjectType(item.project_type)))
@@ -208,16 +223,12 @@ const filteredItems = computed(() => {
 	if (query) {
 		result = fuse.search(query).map(({ item }) => item)
 	} else {
-		result = [...items.value].sort((a, b) => {
-			const nameA = a.project?.title ?? a.file_name
-			const nameB = b.project?.title ?? b.file_name
-			return nameA.toLowerCase().localeCompare(nameB.toLowerCase())
-		})
+		result = sortContentItems(items.value)
 	}
 
 	if (selectedFilters.value.length > 0) {
 		const typeFilters = selectedFilters.value.filter((f) => !attributeFilterIds.has(f))
-		const hasDisabledFilter = selectedFilters.value.includes('disabled')
+		const hasDisabledFilter = props.enableToggle && selectedFilters.value.includes('disabled')
 		const hasWarningsFilter = selectedFilters.value.includes('warnings')
 		result = result.filter((item) => {
 			if (typeFilters.length > 0 && !typeFilters.includes(normalizeProjectType(item.project_type)))
@@ -228,21 +239,21 @@ const filteredItems = computed(() => {
 		})
 	}
 
-	return result
+	return sortContentItems(result, !query)
 })
 
 const tableItems = computed<ContentCardTableItem[]>(() =>
 	filteredItems.value.map((item) => ({
-		id: item.file_name,
+		id: item.id,
 		project: item.project ?? {
-			id: item.file_name,
+			id: item.id,
 			slug: null,
 			title: item.file_name,
 			icon_url: null,
 		},
-		projectLink: item.project?.id ? `/project/${item.project.id}` : undefined,
+		projectLink: !item.external && item.project?.id ? `/project/${item.project.id}` : undefined,
 		version: item.version ?? {
-			id: item.file_name,
+			id: item.id,
 			version_number: 'Unknown',
 			file_name: item.file_name,
 		},
@@ -278,6 +289,20 @@ const tableItems = computed<ContentCardTableItem[]>(() =>
 		],
 	})),
 )
+const externalItemIds = computed(
+	() => new Set(items.value.filter((item) => item.external).map((item) => item.id)),
+)
+const externalSlicerUrls = computed(() => {
+	const urls: Record<string, string> = {}
+	for (const item of items.value) {
+		if (item.external && item.external_url) {
+			urls[item.id] = `https://slicer.run/?url=${encodeURIComponent(item.external_url)}`
+		}
+	}
+	return urls
+})
+const hasExternalSlicerUrls = computed(() => Object.keys(externalSlicerUrls.value).length > 0)
+const showTableActions = computed(() => props.enableToggle || hasExternalSlicerUrls.value)
 
 function getTypeIcon(type: string) {
 	switch (type) {
@@ -293,9 +318,23 @@ function getTypeIcon(type: string) {
 	}
 }
 
-function handleEnabledChange(fileName: string, value: boolean) {
+function sortContentItems(contentItems: ContentItem[], sortByName = true) {
+	return [...contentItems].sort((a, b) => {
+		const externalDiff = Number(b.external === true) - Number(a.external === true)
+		if (externalDiff !== 0) return externalDiff
+		if (!sortByName) return 0
+
+		return itemDisplayName(a).toLowerCase().localeCompare(itemDisplayName(b).toLowerCase())
+	})
+}
+
+function itemDisplayName(item: ContentItem) {
+	return item.project?.title ?? item.file_name
+}
+
+function handleEnabledChange(id: string, value: boolean) {
 	if (props.actionDisabled) return
-	const item = items.value.find((i) => i.file_name === fileName)
+	const item = items.value.find((item) => item.id === id)
 	if (!item) return
 	emit('update:enabled', item, value)
 }
@@ -388,9 +427,10 @@ function updateItem(fileName: string, updates: Partial<ContentItem> & { disabled
 }
 
 function setItems(contentItems: ContentItem[]) {
+	const contentIds = new Set(contentItems.map((item) => item.id))
 	const contentFileNames = new Set(contentItems.map((item) => item.file_name))
 	items.value = contentItems.map((item) => ({ ...item }))
-	selectedIds.value = selectedIds.value.filter((id) => contentFileNames.has(id))
+	selectedIds.value = selectedIds.value.filter((id) => contentIds.has(id))
 	disabledIds.value = new Set([...disabledIds.value].filter((id) => contentFileNames.has(id)))
 	loading.value = false
 }
@@ -414,7 +454,7 @@ defineExpose({ show, showLoading, hide, getState, restore, updateItem, setItems
 				:tint-by="props.modpackName"
 			/>
 			<span class="text-lg font-extrabold text-contrast">
-				{{ formatMessage(messages.header) }}
+				{{ props.header ?? formatMessage(messages.header) }}
 			</span>
 		</template>
 		<div class="flex flex-col h-[min(600px,calc(95vh-10rem))]">
@@ -498,7 +538,7 @@ defineExpose({ show, showLoading, hide, getState, restore, updateItem, setItems
 						<div
 							class="flex min-w-0 items-center gap-4"
 							:class="
-								props.enableToggle
+								showTableActions
 									? 'flex-1 @[800px]:w-[45%] @[800px]:shrink-0 @[800px]:flex-none'
 									: 'flex-1'
 							"
@@ -517,13 +557,13 @@ defineExpose({ show, showLoading, hide, getState, restore, updateItem, setItems
 						</div>
 						<div
 							class="hidden @[800px]:flex"
-							:class="props.enableToggle ? 'flex-1 min-w-0' : 'flex-1'"
+							:class="showTableActions ? 'flex-1 min-w-0' : 'flex-1'"
 						>
 							<span class="font-semibold text-secondary">{{
 								formatMessage(commonMessages.versionLabel)
 							}}</span>
 						</div>
-						<div v-if="props.enableToggle" class="min-w-[160px] shrink-0 text-right">
+						<div v-if="showTableActions" class="min-w-[160px] shrink-0 text-right">
 							<span class="font-semibold text-secondary">{{
 								formatMessage(commonMessages.actionsLabel)
 							}}</span>
@@ -534,6 +574,7 @@ defineExpose({ show, showLoading, hide, getState, restore, updateItem, setItems
 							v-model:selected-ids="selectedIds"
 							:items="tableItems"
 							:show-selection="props.enableToggle"
+							:show-item-actions="hasExternalSlicerUrls"
 							hide-delete
 							hide-header
 							flat
@@ -542,7 +583,30 @@ defineExpose({ show, showLoading, hide, getState, restore, updateItem, setItems
 									? { 'update:enabled': (id: string, val: boolean) => handleEnabledChange(id, val) }
 									: {}
 							"
-						/>
+						>
+							<template #itemTitleBadges="{ item }">
+								<span
+									v-if="externalItemIds.has(item.id)"
+									v-tooltip="formatMessage(messages.externalContentDescription)"
+									class="inline-flex shrink-0 items-center rounded-full border border-solid border-orange bg-orange-highlight px-2 py-0.5 text-xs font-semibold leading-4 text-orange"
+								>
+									{{ formatMessage(messages.externalContent) }}
+								</span>
+							</template>
+							<template #itemButtonsRight="{ item }">
+								<ButtonStyled v-if="externalSlicerUrls[item.id]" circular type="transparent">
+									<a
+										v-tooltip="formatMessage(messages.openInSlicer)"
+										:aria-label="formatMessage(messages.openInSlicer)"
+										:href="externalSlicerUrls[item.id]"
+										target="_blank"
+										rel="noopener noreferrer"
+									>
+										<ExternalIcon class="size-4" />
+									</a>
+								</ButtonStyled>
+							</template>
+						</ContentCardTable>
 					</div>
 				</div>
 			</div>
diff --git a/packages/ui/src/layouts/shared/content-tab/index.ts b/packages/ui/src/layouts/shared/content-tab/index.ts
index 403e11aac..ffb63e9c6 100644
--- a/packages/ui/src/layouts/shared/content-tab/index.ts
+++ b/packages/ui/src/layouts/shared/content-tab/index.ts
@@ -4,6 +4,7 @@ export { default as ContentCardTable } from './components/ContentCardTable.vue'
 export { default as ContentModpackCard } from './components/ContentModpackCard.vue'
 export { default as ConfirmBulkUpdateModal } from './components/modals/ConfirmBulkUpdateModal.vue'
 export { default as ConfirmDeletionModal } from './components/modals/ConfirmDeletionModal.vue'
+export { default as ConfirmDisableModal } from './components/modals/ConfirmDisableModal.vue'
 export { default as ConfirmModpackUpdateModal } from './components/modals/ConfirmModpackUpdateModal.vue'
 export { default as ConfirmReinstallModal } from './components/modals/ConfirmReinstallModal.vue'
 export { default as ConfirmRepairModal } from './components/modals/ConfirmRepairModal.vue'
@@ -16,6 +17,7 @@ export type {
 	ContentInstallProjectOwner,
 } from './components/modals/ContentInstallModal.vue'
 export { default as ContentInstallModal } from './components/modals/ContentInstallModal.vue'
+export { default as InlineBackupCreator } from './components/modals/InlineBackupCreator.vue'
 export type { ModpackContentModalState } from './components/modals/ModpackContentModal.vue'
 export { default as ModpackContentModal } from './components/modals/ModpackContentModal.vue'
 export { default as ContentCardLayout } from './layout.vue'
diff --git a/packages/ui/src/layouts/shared/content-tab/layout.vue b/packages/ui/src/layouts/shared/content-tab/layout.vue
index ffd3477d2..bdee7c24a 100644
--- a/packages/ui/src/layouts/shared/content-tab/layout.vue
+++ b/packages/ui/src/layouts/shared/content-tab/layout.vue
@@ -33,6 +33,7 @@ import ContentModpackCard from './components/ContentModpackCard.vue'
 import ContentSelectionBar from './components/ContentSelectionBar.vue'
 import ConfirmBulkUpdateModal from './components/modals/ConfirmBulkUpdateModal.vue'
 import ConfirmDeletionModal from './components/modals/ConfirmDeletionModal.vue'
+import ConfirmDisableModal from './components/modals/ConfirmDisableModal.vue'
 import ConfirmUnlinkModal from './components/modals/ConfirmUnlinkModal.vue'
 import ContentDependencyWarningModal from './components/modals/ContentDependencyWarningModal.vue'
 import {
@@ -45,7 +46,12 @@ import {
 	useContentSelection,
 } from './composables'
 import { injectContentManager } from './providers/content-manager'
-import type { BulkOperationStatus, ContentCardTableItem, ContentItem } from './types'
+import type {
+	BulkOperationStatus,
+	ContentActionWarning,
+	ContentCardTableItem,
+	ContentItem,
+} from './types'
 
 const { formatMessage } = useVIntl()
 const debug = useDebugLogger('ContentPageLayout')
@@ -280,13 +286,14 @@ const tableItems = computed<ContentCardTableItem[]>(() => {
 			toggleDisabled: ctx.isBusy.value,
 			toggleDisabledTooltip: ctx.isBusy.value ? (ctx.busyMessage?.value ?? null) : null,
 			installing: item.installing === true,
-			hasUpdate: item.has_update,
+			hasUpdate: base.hasUpdate ?? item.has_update,
 			isClientOnly:
 				isClientOnlyEnvironment(item.environment) ||
 				!!item.pack_client_retained ||
 				!!item.pack_client_depends,
 			clientWarning: getClientWarningType(item),
-			hideSwitchVersion: !base.versionLink,
+			hideDelete: base.hideDelete,
+			hideSwitchVersion: base.hideSwitchVersion ?? !base.versionLink,
 			overflowOptions: ctx.getOverflowOptions?.(item),
 		}
 	})
@@ -322,8 +329,12 @@ const hasOutdatedProjects = computed(() => {
 
 //  Deletion
 const pendingDeletionItems = ref<ContentItem[]>([])
+const pendingDeletionWarning = ref<ContentActionWarning | null>(null)
 const confirmDeletionModal = ref<InstanceType<typeof ConfirmDeletionModal>>()
+const confirmDisableModal = ref<InstanceType<typeof ConfirmDisableModal>>()
 const contentDependencyWarningModal = ref<InstanceType<typeof ContentDependencyWarningModal>>()
+const pendingDisableItems = ref<ContentItem[]>([])
+const pendingDisableWarning = ref<ContentActionWarning | null>(null)
 const pendingDependencyWarningItems = ref<ContentCardTableItem[]>([])
 const pendingDependencyWarningDependents = ref<
 	Array<{
@@ -340,17 +351,30 @@ function mapToDisplayItem(item: ContentItem) {
 	}
 }
 
+function canDeleteItem(item: ContentItem) {
+	return ctx.canDeleteItem?.(item) ?? true
+}
+
+function canToggleItem(item: ContentItem) {
+	return ctx.canToggleItem?.(item) ?? true
+}
+
+const deletableSelectedItems = computed(() => selectedItems.value.filter(canDeleteItem))
+const toggleableSelectedItems = computed(() => selectedItems.value.filter(canToggleItem))
+
 async function promptDeleteItems(items: ContentItem[], event?: MouseEvent) {
-	if (items.length === 0) return
-	pendingDeletionItems.value = items
+	const deletableItems = items.filter(canDeleteItem)
+	if (deletableItems.length === 0) return
+	pendingDeletionItems.value = deletableItems
+	pendingDeletionWarning.value = ctx.getDeleteWarning?.(deletableItems) ?? null
 	pendingDependencyWarningItems.value = []
 	pendingDependencyWarningDependents.value = []
 	pendingDependencyWarningDisableTargets.value = []
-	const deletingIds = new Set(items.map(getItemId))
+	const deletingIds = new Set(deletableItems.map(getItemId))
 
 	const warning = ctx.getDeleteDependencyWarning
 		? await Promise.resolve()
-				.then(() => ctx.getDeleteDependencyWarning!(items))
+				.then(() => ctx.getDeleteDependencyWarning!(deletableItems))
 				.catch(() => null)
 		: null
 	if (warning) {
@@ -366,7 +390,7 @@ async function promptDeleteItems(items: ContentItem[], event?: MouseEvent) {
 		const relevantDependencyIds = new Set(
 			remainingDependents.flatMap((dependent) => dependent.dependencies.map(getItemId)),
 		)
-		const warningItems = items.filter((item) => relevantDependencyIds.has(getItemId(item)))
+		const warningItems = deletableItems.filter((item) => relevantDependencyIds.has(getItemId(item)))
 		if (warningItems.length === 0) {
 			showDeletionConfirmation(event)
 			return
@@ -390,7 +414,11 @@ async function promptDeleteItems(items: ContentItem[], event?: MouseEvent) {
 }
 
 async function showDeletionConfirmation(event?: MouseEvent) {
-	if ((event?.shiftKey || skipNonEssentialWarnings.value) && !ctx.isBusy.value) {
+	if (
+		!pendingDeletionWarning.value &&
+		(event?.shiftKey || skipNonEssentialWarnings.value) &&
+		!ctx.isBusy.value
+	) {
 		confirmDelete()
 	} else {
 		await nextTick()
@@ -419,6 +447,11 @@ async function confirmDependencyWarningDelete(disableDependentsAfterDeleting: bo
 
 	pendingDependencyWarningItems.value = []
 	pendingDependencyWarningDependents.value = []
+	if (pendingDeletionWarning.value) {
+		confirmDeletionModal.value?.show()
+		return
+	}
+
 	await confirmDelete()
 }
 
@@ -427,6 +460,10 @@ async function disablePendingDependencyWarningDependents() {
 	pendingDependencyWarningDisableTargets.value = []
 	if (items.length === 0) return
 
+	await promptDisableItems(items)
+}
+
+async function disableItemsWithoutWarning(items: ContentItem[]) {
 	if (ctx.bulkDisableItems) {
 		await ctx.bulkDisableItems(items)
 		return
@@ -447,6 +484,7 @@ async function confirmDelete() {
 	if (ctx.isBusy.value) return
 	const itemsToDelete = [...pendingDeletionItems.value]
 	pendingDeletionItems.value = []
+	pendingDeletionWarning.value = null
 	if (itemsToDelete.length === 0) return
 
 	if (ctx.bulkDeleteItems && itemsToDelete.length > 1) {
@@ -495,10 +533,75 @@ async function confirmDelete() {
 	await disablePendingDependencyWarningDependents()
 }
 
+async function promptDisableItems(items: ContentItem[]) {
+	if (items.length === 0) return
+	pendingDisableItems.value = items
+	const warning = ctx.getDisableWarning?.(items) ?? null
+	if (warning) {
+		pendingDisableWarning.value = warning
+		confirmDisableModal.value?.show()
+		return
+	}
+
+	await confirmDisable()
+}
+
+async function confirmDisable() {
+	if (ctx.isBusy.value) return
+	const itemsToDisable = [...pendingDisableItems.value]
+	pendingDisableItems.value = []
+	pendingDisableWarning.value = null
+	if (itemsToDisable.length === 0) return
+
+	if (ctx.bulkDisableItems && itemsToDisable.length > 1) {
+		isBulkOperating.value = true
+		bulkOperation.value = 'disable'
+		bulkProgress.value = 0
+		bulkTotal.value = itemsToDisable.length
+		bulkWaiting.value = true
+		try {
+			await disableItemsWithoutWarning(itemsToDisable)
+		} finally {
+			clearSelection()
+			isBulkOperating.value = false
+			bulkOperation.value = null
+			bulkProgress.value = 0
+			bulkTotal.value = 0
+			bulkWaiting.value = false
+		}
+		return
+	}
+
+	if (itemsToDisable.length === 1) {
+		const item = itemsToDisable[0]
+		const id = getItemId(item)
+		markChanging(id)
+		try {
+			if (ctx.bulkDisableItems) {
+				await ctx.bulkDisableItems(itemsToDisable)
+			} else {
+				await ctx.toggleEnabled(item)
+			}
+		} finally {
+			unmarkChanging(id)
+		}
+		return
+	}
+
+	await runBulk('disable', itemsToDisable, (item) => disableItemsWithoutWarning([item]), {
+		onComplete: clearSelection,
+	})
+}
+
 async function handleToggleEnabledById(id: string, _value: boolean) {
 	if (ctx.isBusy.value) return
 	const item = ctx.items.value.find((i) => getItemId(i) === id)
 	if (!item) return
+	if (!canToggleItem(item)) return
+	if (!_value) {
+		await promptDisableItems([item])
+		return
+	}
 	markChanging(id)
 	try {
 		await ctx.toggleEnabled(item)
@@ -509,7 +612,7 @@ async function handleToggleEnabledById(id: string, _value: boolean) {
 
 async function bulkEnable() {
 	if (ctx.isBusy.value) return
-	const items = selectedItems.value.filter((item) => !item.enabled)
+	const items = toggleableSelectedItems.value.filter((item) => !item.enabled)
 	if (items.length === 0) return
 	if (ctx.bulkEnableItems) {
 		isBulkOperating.value = true
@@ -534,27 +637,9 @@ async function bulkEnable() {
 
 async function bulkDisable() {
 	if (ctx.isBusy.value) return
-	const items = selectedItems.value.filter((item) => item.enabled)
+	const items = toggleableSelectedItems.value.filter((item) => item.enabled)
 	if (items.length === 0) return
-	if (ctx.bulkDisableItems) {
-		isBulkOperating.value = true
-		bulkOperation.value = 'disable'
-		bulkProgress.value = 0
-		bulkTotal.value = items.length
-		bulkWaiting.value = true
-		try {
-			await ctx.bulkDisableItems(items)
-		} finally {
-			clearSelection()
-			isBulkOperating.value = false
-			bulkOperation.value = null
-			bulkProgress.value = 0
-			bulkTotal.value = 0
-			bulkWaiting.value = false
-		}
-		return
-	}
-	await runBulk('disable', items, (item) => ctx.toggleEnabled(item), { onComplete: clearSelection })
+	await promptDisableItems(items)
 }
 
 function handleUpdateById(id: string) {
@@ -696,16 +781,12 @@ const confirmUnlinkModal = ref<InstanceType<typeof ConfirmUnlinkModal>>()
 					:has-update="ctx.modpack.value.hasUpdate"
 					:disabled="ctx.modpack.value.disabled"
 					:disabled-text="ctx.modpack.value.disabledText"
-					:show-content-hint="
-						!!(ctx.showContentHint?.value && ctx.modpack.value && ctx.items.value.length === 0)
-					"
 					v-on="{
 						...(ctx.updateModpack ? { update: () => ctx.updateModpack?.() } : {}),
 						...(ctx.viewModpackContent ? { content: () => ctx.viewModpackContent?.() } : {}),
 						...(ctx.unlinkModpack ? { unlink: () => confirmUnlinkModal?.show() } : {}),
 						...(ctx.openSettings ? { settings: () => ctx.openSettings?.() } : {}),
 					}"
-					@dismiss-content-hint="ctx.dismissContentHint?.()"
 				/>
 
 				<template v-if="ctx.items.value.length > 0">
@@ -737,20 +818,6 @@ const confirmUnlinkModal = ref<InstanceType<typeof ConfirmUnlinkModal>>()
 							/>
 
 							<div class="flex gap-2">
-								<ButtonStyled color="brand">
-									<button
-										v-tooltip="
-											ctx.busyMessage?.value ??
-											(ctx.disableAddContent?.value ? ctx.disableAddContentTooltip : undefined)
-										"
-										:disabled="ctx.isBusy.value || ctx.disableAddContent?.value"
-										class="!h-10 flex items-center gap-2"
-										@click="ctx.browse"
-									>
-										<CompassIcon class="size-5" />
-										<span>{{ formatMessage(messages.browseContent) }}</span>
-									</button>
-								</ButtonStyled>
 								<ButtonStyled type="outlined">
 									<button
 										v-tooltip="
@@ -765,6 +832,20 @@ const confirmUnlinkModal = ref<InstanceType<typeof ConfirmUnlinkModal>>()
 										{{ formatMessage(messages.uploadFiles) }}
 									</button>
 								</ButtonStyled>
+								<ButtonStyled color="brand">
+									<button
+										v-tooltip="
+											ctx.busyMessage?.value ??
+											(ctx.disableAddContent?.value ? ctx.disableAddContentTooltip : undefined)
+										"
+										:disabled="ctx.isBusy.value || ctx.disableAddContent?.value"
+										class="!h-10 flex items-center gap-2"
+										@click="ctx.browse"
+									>
+										<CompassIcon class="size-5" />
+										<span>{{ formatMessage(messages.browseContent) }}</span>
+									</button>
+								</ButtonStyled>
 							</div>
 						</div>
 
@@ -947,6 +1028,7 @@ const confirmUnlinkModal = ref<InstanceType<typeof ConfirmUnlinkModal>>()
 			:bulk-item-count="bulkItemCount"
 			:aria-label="formatMessage(commonMessages.selectionActionsLabel)"
 			:get-item-id="getItemId"
+			:toggle-items="toggleableSelectedItems"
 			@clear="clearSelection"
 			@enable="bulkEnable"
 			@disable="bulkDisable"
@@ -1013,9 +1095,10 @@ const confirmUnlinkModal = ref<InstanceType<typeof ConfirmUnlinkModal>>()
 			</template>
 
 			<template #actions-end>
-				<div class="mx-1 h-6 w-px bg-surface-5" />
+				<div v-if="deletableSelectedItems.length > 0" class="mx-1 h-6 w-px bg-surface-5" />
 
 				<ButtonStyled
+					v-if="deletableSelectedItems.length > 0"
 					type="transparent"
 					color="red"
 					color-fill="text"
@@ -1036,12 +1119,22 @@ const confirmUnlinkModal = ref<InstanceType<typeof ConfirmUnlinkModal>>()
 			ref="confirmDeletionModal"
 			:count="pendingDeletionItems.length"
 			:item-type="ctx.contentTypeLabel.value"
+			:warning="pendingDeletionWarning"
 			:variant="ctx.deletionContext ?? 'instance'"
 			:backup-tip="pendingDeletionItems.map((i) => i.project?.title ?? i.file_name).join(', ')"
 			:action-disabled="ctx.isBusy.value"
 			:action-disabled-tooltip="ctx.busyMessage?.value ?? undefined"
 			@delete="confirmDelete"
 		/>
+		<ConfirmDisableModal
+			ref="confirmDisableModal"
+			:count="pendingDisableItems.length"
+			:item-type="ctx.contentTypeLabel.value"
+			:warning="pendingDisableWarning"
+			:action-disabled="ctx.isBusy.value"
+			:action-disabled-tooltip="ctx.busyMessage?.value ?? undefined"
+			@disable="confirmDisable"
+		/>
 		<ContentDependencyWarningModal
 			ref="contentDependencyWarningModal"
 			:items="pendingDependencyWarningItems"
diff --git a/packages/ui/src/layouts/shared/content-tab/providers/content-manager.ts b/packages/ui/src/layouts/shared/content-tab/providers/content-manager.ts
index ec92f4cb1..8b8a88d24 100644
--- a/packages/ui/src/layouts/shared/content-tab/providers/content-manager.ts
+++ b/packages/ui/src/layouts/shared/content-tab/providers/content-manager.ts
@@ -6,6 +6,7 @@ import { createContext } from '#ui/providers/create-context'
 
 import type {
 	BulkOperationStatus,
+	ContentActionWarning,
 	ContentCardTableItem,
 	ContentItem,
 	ContentModpackCardCategory,
@@ -65,6 +66,10 @@ export interface ContentManagerContext {
 	bulkDeleteItems?: (items: ContentItem[]) => Promise<void>
 	bulkEnableItems?: (items: ContentItem[]) => Promise<void>
 	bulkDisableItems?: (items: ContentItem[]) => Promise<void>
+	canDeleteItem?: (item: ContentItem) => boolean
+	canToggleItem?: (item: ContentItem) => boolean
+	getDeleteWarning?: (items: ContentItem[]) => ContentActionWarning | null
+	getDisableWarning?: (items: ContentItem[]) => ContentActionWarning | null
 	getDeleteDependencyWarning?: (
 		items: ContentItem[],
 	) => ContentDependencyWarning | null | Promise<ContentDependencyWarning | null>
@@ -100,10 +105,6 @@ export interface ContentManagerContext {
 	// Deletion context (controls modal variant)
 	deletionContext?: 'instance' | 'server'
 
-	// One-time content hint (optional — shows tooltip on modpack content button)
-	showContentHint?: Ref<boolean>
-	dismissContentHint?: () => void
-
 	// Table item mapping (link generation differs per platform)
 	mapToTableItem: (item: ContentItem) => ContentCardTableItem
 
diff --git a/packages/ui/src/layouts/shared/content-tab/types.ts b/packages/ui/src/layouts/shared/content-tab/types.ts
index caf96bf68..c92f8216a 100644
--- a/packages/ui/src/layouts/shared/content-tab/types.ts
+++ b/packages/ui/src/layouts/shared/content-tab/types.ts
@@ -23,6 +23,20 @@ export interface ContentOwner {
 
 export type ClientWarningType = 'retained' | 'depends' | 'environment'
 
+export type ContentSourceKind =
+	| 'local'
+	| 'modrinth_modpack'
+	| 'server_project'
+	| 'modrinth_hosting'
+	| 'imported_modpack'
+	| 'shared_instance'
+
+export interface ContentActionWarning {
+	admonitionHeader: string
+	admonitionBody: string
+	actionLabel: string
+}
+
 export interface ContentCardTableItem {
 	id: string
 	project: ContentCardProject
@@ -39,6 +53,7 @@ export interface ContentCardTableItem {
 	hasUpdate?: boolean
 	isClientOnly?: boolean
 	clientWarning?: ClientWarningType | null
+	hideDelete?: boolean
 	hideSwitchVersion?: boolean
 	overflowOptions?: OverflowMenuOption[]
 }
@@ -70,6 +85,9 @@ export interface ContentItem extends Omit<
 	pack_client_retained?: boolean
 	pack_client_depends?: boolean
 	installing?: boolean
+	source_kind?: ContentSourceKind | null
+	external?: boolean
+	external_url?: string
 }
 
 export type ContentModpackCardProject = Pick<
diff --git a/packages/ui/src/layouts/shared/installation-settings/components/ContentDiffModal.vue b/packages/ui/src/layouts/shared/installation-settings/components/ContentDiffModal.vue
index b9fc157fd..e13df1703 100644
--- a/packages/ui/src/layouts/shared/installation-settings/components/ContentDiffModal.vue
+++ b/packages/ui/src/layouts/shared/installation-settings/components/ContentDiffModal.vue
@@ -4,19 +4,17 @@
 		:header="header"
 		:closable="true"
 		:disable-close="disableClose"
+		:on-hide="handleHide"
 		max-width="544px"
 		width="544px"
 		no-padding
+		scrollable
 	>
 		<div class="flex flex-col gap-4" :class="hasExternalDiffs ? 'px-6 py-4' : 'p-4'">
 			<template v-if="hasExternalDiffs">
 				<p v-if="description" class="m-0 text-primary">{{ description }}</p>
-				<Admonition
-					v-if="hasExternalDiffs"
-					type="warning"
-					:header="formatMessage(messages.unknownFilesWarning)"
-				>
-					{{ formatMessage(messages.unknownFilesDescription) }}
+				<Admonition type="warning" :header="formatMessage(messages.unknownFilesWarning)">
+					{{ externalWarningDescription || formatMessage(messages.unknownFilesDescription) }}
 				</Admonition>
 			</template>
 			<Admonition v-else :type="hasUnknownContent ? 'warning' : 'info'" :header="admonitionHeader">
@@ -41,17 +39,28 @@
 						<MinusIcon class="size-4" />
 						{{ formatMessage(messages.removedCount, { count: removedCount }) }}
 					</div>
+					<div v-if="removedDisabledCount" class="flex items-center gap-1">
+						<MinusIcon class="size-4" />
+						{{ formatMessage(messages.removedDisabledCount, { count: removedDisabledCount }) }}
+					</div>
 				</div>
 			</div>
 		</div>
 
 		<div
-			v-if="diffs.length"
-			class="flex max-h-[272px] flex-col overflow-y-auto border-0 border-y border-solid border-surface-5 bg-surface-2 px-3 py-4"
+			class="flex max-h-[272px] flex-col overflow-y-auto border-0 border-y border-solid border-surface-5 bg-surface-2 px-3 py-2"
 		>
+			<div v-if="!diffs.length" class="flex h-10 min-h-10 items-center gap-2 px-2">
+				<div class="flex w-4 shrink-0 items-center justify-center">
+					<MinusIcon class="size-4" />
+				</div>
+				<span class="text-sm font-medium text-contrast">
+					{{ formatMessage(messages.noContentChanges) }}
+				</span>
+			</div>
 			<div
 				v-for="(diff, index) in sortedDiffs"
-				:key="diff.projectName || diff.fileName || index"
+				:key="diff.projectName || diff.fileName || (isConfigurationDiff(diff) ? diff.type : index)"
 				class="flex h-10 min-h-10 items-center gap-2"
 				:class="showExternalWarning(diff) ? '-mx-3 px-5' : 'px-2'"
 				:style="
@@ -67,8 +76,14 @@
 						v-if="index > 0"
 						class="absolute left-1/2 top-0 h-3 w-px -translate-x-1/2 bg-surface-5"
 					/>
-					<PlusIcon v-if="diff.type === 'added'" class="relative z-[1] size-4" />
-					<MinusIcon v-else-if="diff.type === 'removed'" class="relative z-[1] size-4 text-red" />
+					<PlusIcon
+						v-if="diff.type === 'added' || diff.type === 'modpack_linked'"
+						class="relative z-[1] size-4"
+					/>
+					<MinusIcon
+						v-else-if="diff.type === 'removed' || diff.type === 'modpack_unlinked'"
+						class="relative z-[1] size-4 text-red"
+					/>
 					<RefreshCwIcon v-else class="relative z-[1] size-4" />
 					<div
 						v-if="index < sortedDiffs.length - 1"
@@ -84,7 +99,10 @@
 							{{ formatMessage(messages.unknownProject) }}
 						</span>
 					</template>
-					<span v-else class="truncate font-medium text-contrast">
+					<span
+						v-else-if="!isConfigurationDiff(diff) || diff.type === 'modpack_updated'"
+						class="truncate font-medium text-contrast"
+					>
 						{{ diff.projectName || (diff.fileName ? decodeURIComponent(diff.fileName) : '') }}
 					</span>
 				</div>
@@ -99,6 +117,10 @@
 			</div>
 		</div>
 
+		<div v-if="$slots['additional-content']" class="px-4 pt-4">
+			<slot name="additional-content" />
+		</div>
+
 		<div
 			v-if="showBackupCreator"
 			class="p-4 border-t border-solid border-surface-5 border-b-0 border-l-0 border-r-0"
@@ -114,38 +136,52 @@
 		<template #actions>
 			<div v-if="hasExternalDiffs" class="flex flex-col gap-6 p-2">
 				<p class="m-0 text-primary">{{ formatMessage(messages.reviewedFiles) }}</p>
-				<div class="flex justify-end gap-2">
-					<ButtonStyled type="transparent" color="orange">
-						<button :disabled="buttonsDisabled" @click="handleConfirm">
-							{{ formatMessage(messages.installAnyway) }}
-						</button>
-					</ButtonStyled>
-					<ButtonStyled color="brand">
-						<button @click="handleCancel">
-							<BanIcon />
-							{{ formatMessage(messages.dontInstall) }}
-						</button>
-					</ButtonStyled>
+				<div class="flex justify-between gap-2">
+					<div>
+						<ButtonStyled v-if="showReportButton" color="red" type="transparent">
+							<button @click="emit('report', $event)">
+								<ReportIcon />
+								{{ formatMessage(commonMessages.reportButton) }}
+							</button>
+						</ButtonStyled>
+					</div>
+					<div class="flex gap-2">
+						<ButtonStyled type="transparent" color="orange">
+							<button :disabled="buttonsDisabled || confirmDisabled" @click="handleConfirm">
+								{{ formatMessage(messages.installAnyway) }}
+							</button>
+						</ButtonStyled>
+						<ButtonStyled color="brand">
+							<button @click="handleCancel">
+								<BanIcon />
+								{{ formatMessage(messages.dontInstall) }}
+							</button>
+						</ButtonStyled>
+					</div>
 				</div>
 			</div>
-			<div v-else class="flex justify-between gap-2 pt-4">
+			<div
+				v-else
+				class="flex justify-between gap-2"
+				:class="{ 'pt-4': !$slots['additional-content'] }"
+			>
 				<div>
 					<ButtonStyled v-if="showReportButton" color="red" type="transparent">
-						<button @click="emit('report')">
+						<button @click="emit('report', $event)">
 							<ReportIcon />
 							{{ formatMessage(commonMessages.reportButton) }}
 						</button>
 					</ButtonStyled>
 				</div>
 				<div class="flex gap-2">
-					<ButtonStyled>
-						<button @click="handleCancel">
+					<ButtonStyled type="outlined">
+						<button class="!border" @click="handleCancel">
 							<XIcon />
 							{{ formatMessage(commonMessages.cancelButton) }}
 						</button>
 					</ButtonStyled>
 					<ButtonStyled color="brand">
-						<button :disabled="buttonsDisabled" @click="handleConfirm">
+						<button :disabled="buttonsDisabled || confirmDisabled" @click="handleConfirm">
 							<component :is="confirmIcon" v-if="confirmIcon" />
 							{{ confirmLabel || formatMessage(commonMessages.confirmButton) }}
 						</button>
@@ -187,16 +223,19 @@ const props = defineProps<{
 	confirmIcon?: Component
 	showReportButton?: boolean
 	showBackupCreator?: boolean
+	addedLabel?: string
 	removedLabel?: string
+	confirmDisabled?: boolean
 	disableClose?: boolean
 	showExternalWarnings?: boolean
+	externalWarningDescription?: string
 	versionDate?: string
 }>()
 
 const emit = defineEmits<{
 	confirm: []
 	cancel: []
-	report: []
+	report: [event?: MouseEvent]
 }>()
 
 const { formatMessage } = useVIntl()
@@ -204,38 +243,105 @@ const { formatMessage } = useVIntl()
 const modal = ref<InstanceType<typeof NewModal>>()
 const backupCreator = ref<InstanceType<typeof InlineBackupCreator>>()
 const buttonsDisabled = ref(false)
+const closingFromAction = ref(false)
 
-const removedCount = computed(() => props.diffs.filter((d) => d.type === 'removed').length)
-const addedCount = computed(() => props.diffs.filter((d) => d.type === 'added').length)
-const updatedCount = computed(() => props.diffs.filter((d) => d.type === 'updated').length)
+const removedCount = computed(
+	() => props.diffs.filter((diff) => diff.type === 'removed' && !diff.disabled).length,
+)
+const removedDisabledCount = computed(
+	() => props.diffs.filter((diff) => diff.type === 'removed' && diff.disabled).length,
+)
+const addedCount = computed(() => props.diffs.filter((diff) => diff.type === 'added').length)
+const updatedCount = computed(
+	() =>
+		props.diffs.filter((diff) => diff.type === 'updated' || diff.type === 'config_files_updated')
+			.length,
+)
 const hasExternalDiffs = computed(() => props.diffs.some(showExternalWarning))
 
+type DependencyDiffType = Extract<ContentDiffItem['type'], 'added' | 'removed' | 'updated'>
+type ConfigurationDiffType = Exclude<ContentDiffItem['type'], DependencyDiffType>
+
+const configurationDiffTypes = new Set<ConfigurationDiffType>([
+	'modpack_linked',
+	'modpack_updated',
+	'modpack_unlinked',
+	'game_version_updated',
+	'loader_updated',
+	'config_files_updated',
+])
+
+function isDependencyDiff(
+	diff: ContentDiffItem,
+): diff is ContentDiffItem & { type: DependencyDiffType } {
+	return diff.type === 'added' || diff.type === 'removed' || diff.type === 'updated'
+}
+
+function isConfigurationDiff(
+	diff: ContentDiffItem,
+): diff is ContentDiffItem & { type: ConfigurationDiffType } {
+	return configurationDiffTypes.has(diff.type as ConfigurationDiffType)
+}
+
+function showExternalWarning(diff: ContentDiffItem) {
+	return Boolean(
+		props.showExternalWarnings &&
+		diff.external &&
+		isDependencyDiff(diff) &&
+		diff.type !== 'removed',
+	)
+}
+
 const sortedDiffs = computed(() =>
 	[...props.diffs].sort((a, b) => {
 		const aExternal = showExternalWarning(a)
 		const bExternal = showExternalWarning(b)
 		if (aExternal !== bExternal) return aExternal ? -1 : 1
 
-		const typeOrder = { added: 0, updated: 1, removed: 2 }
+		const typeOrder: Record<ContentDiffItem['type'], number> = {
+			modpack_linked: 0,
+			modpack_updated: 0,
+			modpack_unlinked: 0,
+			game_version_updated: 1,
+			loader_updated: 2,
+			config_files_updated: 3,
+			added: 4,
+			updated: 5,
+			removed: 6,
+		}
 		return typeOrder[a.type] - typeOrder[b.type]
 	}),
 )
 
 function getDiffTypeLabel(diff: ContentDiffItem) {
-	if (showExternalWarning(diff)) return formatMessage(externalDiffTypeMessages[diff.type])
+	if (showExternalWarning(diff) && isDependencyDiff(diff)) {
+		return formatMessage(externalDiffTypeMessages[diff.type])
+	}
+	if (diff.type === 'modpack_updated') return formatMessage(diffTypeMessages.updated)
+	if (isConfigurationDiff(diff)) return formatMessage(configurationDiffMessages[diff.type])
+	if (diff.type === 'removed' && diff.disabled) {
+		return formatMessage(diffTypeMessages.removedDisabled)
+	}
+	if (diff.type === 'added' && props.addedLabel) return props.addedLabel
 	if (diff.type === 'removed' && props.removedLabel) return props.removedLabel
 	return formatMessage(diffTypeMessages[diff.type])
 }
 
 function getVersionLabel(diff: ContentDiffItem) {
 	if (showExternalWarning(diff) && diff.fileName) return decodeURIComponent(diff.fileName)
+	if (diff.type === 'config_files_updated' && diff.fileCount !== undefined) {
+		return formatMessage(messages.fileCount, { count: diff.fileCount })
+	}
+	if (diff.type === 'modpack_updated') return diff.newVersionName
+	if (isConfigurationDiff(diff)) {
+		if (diff.currentVersionName && diff.newVersionName) {
+			return `${diff.currentVersionName} → ${diff.newVersionName}`
+		}
+		return diff.newVersionName ?? diff.currentVersionName
+	}
 	return diff.type === 'removed' ? diff.currentVersionName : diff.newVersionName
 }
 
-function showExternalWarning(diff: ContentDiffItem) {
-	return Boolean(props.showExternalWarnings && diff.external && diff.type !== 'removed')
-}
-
 function show(e?: MouseEvent) {
 	modal.value?.show(e)
 }
@@ -245,13 +351,25 @@ function hide() {
 }
 
 function handleConfirm() {
+	closingFromAction.value = true
 	hide()
 	emit('confirm')
+	closingFromAction.value = false
 }
 
 function handleCancel() {
+	closingFromAction.value = true
 	hide()
 	emit('cancel')
+	closingFromAction.value = false
+}
+
+function handleHide() {
+	if (closingFromAction.value) {
+		closingFromAction.value = false
+		return
+	}
+	emit('cancel')
 }
 
 const messages = defineMessages({
@@ -259,6 +377,10 @@ const messages = defineMessages({
 		id: 'content.diff-modal.removed-count',
 		defaultMessage: '{count} removed',
 	},
+	removedDisabledCount: {
+		id: 'content.diff-modal.removed-disabled-count',
+		defaultMessage: '{count} removed (disabled)',
+	},
 	addedCount: {
 		id: 'content.diff-modal.added-count',
 		defaultMessage: '{count} added',
@@ -267,6 +389,14 @@ const messages = defineMessages({
 		id: 'content.diff-modal.updated-count',
 		defaultMessage: '{count} updated',
 	},
+	noContentChanges: {
+		id: 'content.diff-modal.no-content-changes',
+		defaultMessage: 'No content changes',
+	},
+	fileCount: {
+		id: 'content.diff-modal.file-count',
+		defaultMessage: '{count, plural, one {# file} other {# files}}',
+	},
 	unknownContentBody: {
 		id: 'content.diff-modal.unknown-content-body',
 		defaultMessage:
@@ -300,6 +430,33 @@ const messages = defineMessages({
 	},
 })
 
+const configurationDiffMessages = defineMessages({
+	modpack_linked: {
+		id: 'content.diff-modal.modpack-linked',
+		defaultMessage: 'Linked modpack',
+	},
+	modpack_updated: {
+		id: 'content.diff-modal.modpack-updated',
+		defaultMessage: 'Updated modpack',
+	},
+	modpack_unlinked: {
+		id: 'content.diff-modal.modpack-unlinked',
+		defaultMessage: 'Unlinked modpack',
+	},
+	game_version_updated: {
+		id: 'content.diff-modal.game-version-updated',
+		defaultMessage: 'Game version',
+	},
+	loader_updated: {
+		id: 'content.diff-modal.loader-updated',
+		defaultMessage: 'Loader',
+	},
+	config_files_updated: {
+		id: 'content.diff-modal.config-files-updated',
+		defaultMessage: 'Changed config files',
+	},
+})
+
 const diffTypeMessages = defineMessages({
 	added: {
 		id: 'content.diff-modal.diff-type.added',
@@ -309,6 +466,10 @@ const diffTypeMessages = defineMessages({
 		id: 'content.diff-modal.diff-type.removed',
 		defaultMessage: 'Disabled',
 	},
+	removedDisabled: {
+		id: 'content.diff-modal.diff-type.removed-disabled',
+		defaultMessage: 'Removed (disabled)',
+	},
 	updated: {
 		id: 'content.diff-modal.diff-type.updated',
 		defaultMessage: 'Updated',
diff --git a/packages/ui/src/layouts/shared/installation-settings/layout.vue b/packages/ui/src/layouts/shared/installation-settings/layout.vue
index 6bac59721..9d0f40415 100644
--- a/packages/ui/src/layouts/shared/installation-settings/layout.vue
+++ b/packages/ui/src/layouts/shared/installation-settings/layout.vue
@@ -16,6 +16,7 @@ import {
 import { computed, nextTick, onBeforeUnmount, onMounted, onUpdated, ref, watch } from 'vue'
 import { onBeforeRouteLeave } from 'vue-router'
 
+import Admonition from '#ui/components/base/Admonition.vue'
 import AutoLink from '#ui/components/base/AutoLink.vue'
 import Avatar from '#ui/components/base/Avatar.vue'
 import ButtonStyled from '#ui/components/base/ButtonStyled.vue'
@@ -204,6 +205,12 @@ const isLocalFile = computed(() => {
 	return typeof val === 'boolean' ? val : val.value
 })
 
+const isManagedModpack = computed(() => {
+	const val = ctx.isManagedModpack
+	if (val == null) return false
+	return typeof val === 'boolean' ? val : val.value
+})
+
 const isLinkedModpack = computed(() => showModpackVersionActions.value || isLocalFile.value)
 
 function handleModpackUpdateRequest(version: Labrinth.Versions.v2.Version, event?: MouseEvent) {
@@ -226,10 +233,15 @@ function handleModpackUpdateRequest(version: Labrinth.Versions.v2.Version, event
 		? new Date(version.date_published) < new Date(currentVersion.date_published)
 		: false
 	const shouldShowWarning =
+		isManagedModpack.value ||
 		isUpdateDowngrade.value ||
 		versionChangesGameVersion(version, ctx.updaterModalProps.value.currentGameVersion)
 
-	if (event?.shiftKey || skipNonEssentialWarnings.value || !shouldShowWarning) {
+	if (
+		event?.shiftKey ||
+		(skipNonEssentialWarnings.value && !isManagedModpack.value) ||
+		!shouldShowWarning
+	) {
 		debug('handleModpackUpdateRequest: confirming without warning', {
 			isUpdateDowngrade: isUpdateDowngrade.value,
 			shouldShowWarning,
@@ -391,7 +403,7 @@ function handleShowUnlinkModal(event: MouseEvent) {
 		snapshot: stateSnapshot(),
 		refs: modalRefsSnapshot(),
 	})
-	if (event.shiftKey || skipNonEssentialWarnings.value) {
+	if (event.shiftKey || (skipNonEssentialWarnings.value && !isManagedModpack.value)) {
 		handleUnlink()
 		return
 	}
@@ -593,7 +605,7 @@ const messages = defineMessages({
 			<!-- LINKED -->
 			<template v-if="ctx.isLinked.value">
 				<!-- Installed Modpack -->
-				<div class="flex flex-col gap-2.5">
+				<div v-if="ctx.modpack.value" class="flex flex-col gap-2.5">
 					<span class="text-lg font-semibold text-contrast">
 						{{ formatMessage(commonMessages.installedModpackTitle) }}
 					</span>
@@ -667,10 +679,17 @@ const messages = defineMessages({
 							</button>
 						</ButtonStyled>
 					</div>
+					<Admonition
+						v-if="isManagedModpack && (showModpackVersionActions || isLocalFile)"
+						type="warning"
+						:header="ctx.managedModpackWarning?.value.admonitionHeader"
+					>
+						{{ ctx.managedModpackWarning?.value.changeVersionBody }}
+					</Admonition>
 				</div>
 
 				<!-- Unlink -->
-				<div class="flex flex-col gap-2.5">
+				<div v-if="!isManagedModpack" class="flex flex-col gap-2.5">
 					<span class="text-lg font-semibold text-contrast">
 						{{
 							formatMessage(messages.linkedInstanceTitle, {
@@ -1048,6 +1067,14 @@ const messages = defineMessages({
 			<ConfirmModpackUpdateModal
 				ref="modpackUpdateModal"
 				:downgrade="isUpdateDowngrade"
+				:managed-warning="
+					isManagedModpack && ctx.managedModpackWarning
+						? {
+								header: ctx.managedModpackWarning.value.admonitionHeader,
+								body: ctx.managedModpackWarning.value.changeVersionBody,
+							}
+						: null
+				"
 				:backup-tip="
 					[ctx.modpack.value?.title, pendingUpdateVersion?.version_number].filter(Boolean).join(' ')
 				"
@@ -1067,7 +1094,6 @@ const messages = defineMessages({
 				:backup-tip="ctx.modpack.value?.title"
 				@unlink="handleUnlink"
 			/>
-
 			<IncompatibleContentModal
 				v-if="form.incompatibleContentVariant.value"
 				ref="incompatibleContentModal"
diff --git a/packages/ui/src/layouts/shared/installation-settings/providers/installation-settings.ts b/packages/ui/src/layouts/shared/installation-settings/providers/installation-settings.ts
index d41138177..f719d9f4c 100644
--- a/packages/ui/src/layouts/shared/installation-settings/providers/installation-settings.ts
+++ b/packages/ui/src/layouts/shared/installation-settings/providers/installation-settings.ts
@@ -63,6 +63,14 @@ export interface InstallationSettingsContext {
 	/** True when the linked modpack was uploaded as a local file rather than from Modrinth */
 	isLocalFile?: boolean | ComputedRef<boolean>
 
+	/** True when an external source controls the linked modpack. */
+	isManagedModpack?: boolean | ComputedRef<boolean>
+	managedModpackWarning?: ComputedRef<{
+		admonitionHeader: string
+		changeVersionBody: string
+		unlinkBody: string
+	}>
+
 	repairing?: Ref<boolean>
 	reinstalling?: Ref<boolean>
 
diff --git a/packages/ui/src/layouts/shared/installation-settings/types.ts b/packages/ui/src/layouts/shared/installation-settings/types.ts
index f9a4b5644..a711d3045 100644
--- a/packages/ui/src/layouts/shared/installation-settings/types.ts
+++ b/packages/ui/src/layouts/shared/installation-settings/types.ts
@@ -36,12 +36,23 @@ export interface LoaderVersionEntry {
 }
 
 export interface ContentDiffItem {
-	type: 'added' | 'removed' | 'updated'
-	external?: boolean
+	type:
+		| 'added'
+		| 'removed'
+		| 'updated'
+		| 'modpack_linked'
+		| 'modpack_updated'
+		| 'modpack_unlinked'
+		| 'game_version_updated'
+		| 'loader_updated'
+		| 'config_files_updated'
 	projectName?: string
 	fileName?: string
 	currentVersionName?: string
 	newVersionName?: string
+	fileCount?: number
+	disabled?: boolean
+	external?: boolean
 }
 
 export interface ContentDiffPreview {
diff --git a/packages/ui/src/locales/ar-SA/index.json b/packages/ui/src/locales/ar-SA/index.json
index e11177f88..76eddc6b1 100644
--- a/packages/ui/src/locales/ar-SA/index.json
+++ b/packages/ui/src/locales/ar-SA/index.json
@@ -266,9 +266,6 @@
   "content.confirm-modpack-update.header": {
     "defaultMessage": "{action, select, downgrade {خفض ٳصدار} other {تحديث}} حزمة التعديلات"
   },
-  "content.modpack-card.dismiss-hint": {
-    "defaultMessage": ""
-  },
   "form.label.address-line": {
     "defaultMessage": "خط عنوان"
   },
@@ -735,4 +732,3 @@
     "defaultMessage": "ماينكرافت: إصدار جافا"
   }
 }
-
diff --git a/packages/ui/src/locales/cs-CZ/index.json b/packages/ui/src/locales/cs-CZ/index.json
index 7a2817fe0..049b7e7e4 100644
--- a/packages/ui/src/locales/cs-CZ/index.json
+++ b/packages/ui/src/locales/cs-CZ/index.json
@@ -497,15 +497,6 @@
   "content.inline-backup.world-label": {
     "defaultMessage": "svět"
   },
-  "content.modpack-card.content-hint-description": {
-    "defaultMessage": "Obsah modpacku nyní najdeš zde!"
-  },
-  "content.modpack-card.content-hint-title": {
-    "defaultMessage": "Obsah modpacku byl přesunut"
-  },
-  "content.modpack-card.dismiss-hint": {
-    "defaultMessage": "Znovu nezobrazovat"
-  },
   "content.page-layout.additional-content": {
     "defaultMessage": "Dodatečný obsah"
   },
@@ -4569,4 +4560,3 @@
     "defaultMessage": "Typ"
   }
 }
-
diff --git a/packages/ui/src/locales/de-CH/index.json b/packages/ui/src/locales/de-CH/index.json
index 5db47af38..6a5dd4ed0 100644
--- a/packages/ui/src/locales/de-CH/index.json
+++ b/packages/ui/src/locales/de-CH/index.json
@@ -533,15 +533,6 @@
   "content.inline-backup.world-label": {
     "defaultMessage": "Welt"
   },
-  "content.modpack-card.content-hint-description": {
-    "defaultMessage": "Die Inhalte deines Modpacks können jetzt hier gefunden werden!"
-  },
-  "content.modpack-card.content-hint-title": {
-    "defaultMessage": "Modpack-Inhalte verschoben"
-  },
-  "content.modpack-card.dismiss-hint": {
-    "defaultMessage": "Nicht erneut anzeigen"
-  },
   "content.page-layout.additional-content": {
     "defaultMessage": "Zusätzliche Inhalte"
   },
@@ -5802,4 +5793,3 @@
     "defaultMessage": "Typ"
   }
 }
-
diff --git a/packages/ui/src/locales/de-DE/index.json b/packages/ui/src/locales/de-DE/index.json
index 7ceb24c65..1727919a9 100644
--- a/packages/ui/src/locales/de-DE/index.json
+++ b/packages/ui/src/locales/de-DE/index.json
@@ -533,15 +533,6 @@
   "content.inline-backup.world-label": {
     "defaultMessage": "Welt"
   },
-  "content.modpack-card.content-hint-description": {
-    "defaultMessage": "Die Inhalte deines Modpacks findest du jetzt hier!"
-  },
-  "content.modpack-card.content-hint-title": {
-    "defaultMessage": "Modpack-Inhalte verschoben"
-  },
-  "content.modpack-card.dismiss-hint": {
-    "defaultMessage": "Nicht erneut anzeigen"
-  },
   "content.page-layout.additional-content": {
     "defaultMessage": "Zusätzliche Inhalte"
   },
@@ -5802,4 +5793,3 @@
     "defaultMessage": "Typ"
   }
 }
-
diff --git a/packages/ui/src/locales/en-US/index.json b/packages/ui/src/locales/en-US/index.json
index 3530b2fc7..e994df509 100644
--- a/packages/ui/src/locales/en-US/index.json
+++ b/packages/ui/src/locales/en-US/index.json
@@ -377,6 +377,9 @@
   "content.confirm-deletion.header": {
     "defaultMessage": "Delete {itemType}"
   },
+  "content.confirm-disable.header": {
+    "defaultMessage": "Disable {itemType}"
+  },
   "content.confirm-modpack-update.admonition-body": {
     "defaultMessage": "{action, select, downgrade {Downgrading} other {Updating}} may cause compatibility issues. Mods or content you added on top of the modpack will be kept, but may not be compatible with the new version."
   },
@@ -446,12 +449,18 @@
   "content.diff-modal.added-count": {
     "defaultMessage": "{count} added"
   },
+  "content.diff-modal.config-files-updated": {
+    "defaultMessage": "Changed config files"
+  },
   "content.diff-modal.diff-type.added": {
     "defaultMessage": "Added (dependency)"
   },
   "content.diff-modal.diff-type.removed": {
     "defaultMessage": "Disabled"
   },
+  "content.diff-modal.diff-type.removed-disabled": {
+    "defaultMessage": "Removed (disabled)"
+  },
   "content.diff-modal.diff-type.updated": {
     "defaultMessage": "Updated"
   },
@@ -467,12 +476,36 @@
   "content.diff-modal.external-diff-type.updated": {
     "defaultMessage": "Updated"
   },
+  "content.diff-modal.file-count": {
+    "defaultMessage": "{count, plural, one {# file} other {# files}}"
+  },
+  "content.diff-modal.game-version-updated": {
+    "defaultMessage": "Game version"
+  },
   "content.diff-modal.install-anyway": {
     "defaultMessage": "Install anyway"
   },
+  "content.diff-modal.loader-updated": {
+    "defaultMessage": "Loader"
+  },
+  "content.diff-modal.modpack-linked": {
+    "defaultMessage": "Linked modpack"
+  },
+  "content.diff-modal.modpack-unlinked": {
+    "defaultMessage": "Unlinked modpack"
+  },
+  "content.diff-modal.modpack-updated": {
+    "defaultMessage": "Updated modpack"
+  },
+  "content.diff-modal.no-content-changes": {
+    "defaultMessage": "No content changes"
+  },
   "content.diff-modal.removed-count": {
     "defaultMessage": "{count} removed"
   },
+  "content.diff-modal.removed-disabled-count": {
+    "defaultMessage": "{count} removed (disabled)"
+  },
   "content.diff-modal.reviewed-files": {
     "defaultMessage": "A file is only reviewed if it’s published to Modrinth, regardless of its file format (including .mrpack)."
   },
@@ -533,15 +566,6 @@
   "content.inline-backup.world-label": {
     "defaultMessage": "world"
   },
-  "content.modpack-card.content-hint-description": {
-    "defaultMessage": "Your modpack's content can now be found here!"
-  },
-  "content.modpack-card.content-hint-title": {
-    "defaultMessage": "Modpack content moved"
-  },
-  "content.modpack-card.dismiss-hint": {
-    "defaultMessage": "Don't show again"
-  },
   "content.page-layout.additional-content": {
     "defaultMessage": "Additional content"
   },
@@ -2054,6 +2078,12 @@
   "instances.modpack-content-modal.empty-title": {
     "defaultMessage": "No content found"
   },
+  "instances.modpack-content-modal.external-content": {
+    "defaultMessage": "External"
+  },
+  "instances.modpack-content-modal.external-content-description": {
+    "defaultMessage": "This file is not published on Modrinth."
+  },
   "instances.modpack-content-modal.header": {
     "defaultMessage": "Modpack content"
   },
@@ -2063,6 +2093,9 @@
   "instances.modpack-content-modal.no-results": {
     "defaultMessage": "No projects match your search."
   },
+  "instances.modpack-content-modal.open-in-slicer": {
+    "defaultMessage": "Open in Slicer"
+  },
   "instances.modpack-content-modal.search-placeholder": {
     "defaultMessage": "Search {count, number} {count, plural, one {project} other {projects}}"
   },
@@ -5069,6 +5102,81 @@
   "settings.sessions.title": {
     "defaultMessage": "Sessions"
   },
+  "sharing.invite-players-modal.add": {
+    "defaultMessage": "Add"
+  },
+  "sharing.invite-players-modal.added": {
+    "defaultMessage": "Added"
+  },
+  "sharing.invite-players-modal.already-invited": {
+    "defaultMessage": "This user has already been invited."
+  },
+  "sharing.invite-players-modal.avatar-alt": {
+    "defaultMessage": "{username}'s avatar"
+  },
+  "sharing.invite-players-modal.cancel": {
+    "defaultMessage": "Cancel"
+  },
+  "sharing.invite-players-modal.cancel-button": {
+    "defaultMessage": "Cancel"
+  },
+  "sharing.invite-players-modal.edit-invite-link": {
+    "defaultMessage": "Edit invite link."
+  },
+  "sharing.invite-players-modal.edit-invite-link-title": {
+    "defaultMessage": "Edit invite link"
+  },
+  "sharing.invite-players-modal.expiry-label": {
+    "defaultMessage": "Expiry date"
+  },
+  "sharing.invite-players-modal.friends-heading": {
+    "defaultMessage": "Your friends - {count}"
+  },
+  "sharing.invite-players-modal.invite": {
+    "defaultMessage": "Invite"
+  },
+  "sharing.invite-players-modal.invite-expiry-description": {
+    "defaultMessage": "Your invite link expires in {duration}."
+  },
+  "sharing.invite-players-modal.invite-link-heading": {
+    "defaultMessage": "Or use an invite link"
+  },
+  "sharing.invite-players-modal.link-copied-text": {
+    "defaultMessage": "The invite link has been copied to your clipboard."
+  },
+  "sharing.invite-players-modal.link-copied-title": {
+    "defaultMessage": "Link copied"
+  },
+  "sharing.invite-players-modal.link-copy-failed-title": {
+    "defaultMessage": "Failed to copy link"
+  },
+  "sharing.invite-players-modal.max-uses-label": {
+    "defaultMessage": "Maximum uses"
+  },
+  "sharing.invite-players-modal.no-friends": {
+    "defaultMessage": "No friends found."
+  },
+  "sharing.invite-players-modal.no-search-results": {
+    "defaultMessage": "No matching users found."
+  },
+  "sharing.invite-players-modal.requested": {
+    "defaultMessage": "Request sent"
+  },
+  "sharing.invite-players-modal.requested-tooltip": {
+    "defaultMessage": "{username} needs to accept your friend request first"
+  },
+  "sharing.invite-players-modal.save-button": {
+    "defaultMessage": "Save"
+  },
+  "sharing.invite-players-modal.search-placeholder": {
+    "defaultMessage": "Enter Modrinth username"
+  },
+  "sharing.invite-players-modal.searching": {
+    "defaultMessage": "Searching..."
+  },
+  "sharing.invite-players-modal.update-invite-link-failed-title": {
+    "defaultMessage": "Failed to update invite link"
+  },
   "tag.category.128x": {
     "defaultMessage": "128x"
   },
diff --git a/packages/ui/src/locales/es-419/index.json b/packages/ui/src/locales/es-419/index.json
index 64582c4ba..a1e0ad786 100644
--- a/packages/ui/src/locales/es-419/index.json
+++ b/packages/ui/src/locales/es-419/index.json
@@ -533,15 +533,6 @@
   "content.inline-backup.world-label": {
     "defaultMessage": "mundo"
   },
-  "content.modpack-card.content-hint-description": {
-    "defaultMessage": "¡Ya puedes encontrar el contenido de tu modpack aquí!"
-  },
-  "content.modpack-card.content-hint-title": {
-    "defaultMessage": "Se ha movido el contenido del modpack"
-  },
-  "content.modpack-card.dismiss-hint": {
-    "defaultMessage": "No volver a mostrar"
-  },
   "content.page-layout.additional-content": {
     "defaultMessage": "Contenido adicional"
   },
@@ -5802,4 +5793,3 @@
     "defaultMessage": "Tipo"
   }
 }
-
diff --git a/packages/ui/src/locales/es-ES/index.json b/packages/ui/src/locales/es-ES/index.json
index c51bf0ad8..0470f583c 100644
--- a/packages/ui/src/locales/es-ES/index.json
+++ b/packages/ui/src/locales/es-ES/index.json
@@ -482,15 +482,6 @@
   "content.inline-backup.world-label": {
     "defaultMessage": " mundo"
   },
-  "content.modpack-card.content-hint-description": {
-    "defaultMessage": "¡Ya puedes encontrar el contenido de tu modpack aquí!"
-  },
-  "content.modpack-card.content-hint-title": {
-    "defaultMessage": "Se ha trasladado el contenido del modpack"
-  },
-  "content.modpack-card.dismiss-hint": {
-    "defaultMessage": "No mostrar de nuevo"
-  },
   "content.page-layout.additional-content": {
     "defaultMessage": "Contenido adicional"
   },
diff --git a/packages/ui/src/locales/fr-FR/index.json b/packages/ui/src/locales/fr-FR/index.json
index 8a0c27092..241437a1e 100644
--- a/packages/ui/src/locales/fr-FR/index.json
+++ b/packages/ui/src/locales/fr-FR/index.json
@@ -533,15 +533,6 @@
   "content.inline-backup.world-label": {
     "defaultMessage": "monde"
   },
-  "content.modpack-card.content-hint-description": {
-    "defaultMessage": "Le contenu de votre modpack peut maintenant être retrouvé ici !"
-  },
-  "content.modpack-card.content-hint-title": {
-    "defaultMessage": "Contenu du modpack déplacé"
-  },
-  "content.modpack-card.dismiss-hint": {
-    "defaultMessage": "Ne plus afficher"
-  },
   "content.page-layout.additional-content": {
     "defaultMessage": "Contenu supplémentaire"
   },
diff --git a/packages/ui/src/locales/he-IL/index.json b/packages/ui/src/locales/he-IL/index.json
index fb91692bb..4e98fe7db 100644
--- a/packages/ui/src/locales/he-IL/index.json
+++ b/packages/ui/src/locales/he-IL/index.json
@@ -257,9 +257,6 @@
   "content.inline-backup.create-backup": {
     "defaultMessage": "צור גיבוי"
   },
-  "content.modpack-card.dismiss-hint": {
-    "defaultMessage": "אל תציג שוב"
-  },
   "content.page-layout.additional-content": {
     "defaultMessage": "תוכן נוסף"
   },
diff --git a/packages/ui/src/locales/hu-HU/index.json b/packages/ui/src/locales/hu-HU/index.json
index 4148bf343..4866d03ac 100644
--- a/packages/ui/src/locales/hu-HU/index.json
+++ b/packages/ui/src/locales/hu-HU/index.json
@@ -437,15 +437,6 @@
   "content.inline-backup.world-label": {
     "defaultMessage": "világ"
   },
-  "content.modpack-card.content-hint-description": {
-    "defaultMessage": "Mostantól itt találhatod meg!"
-  },
-  "content.modpack-card.content-hint-title": {
-    "defaultMessage": "A modcsomag tartalmát áthelyeztük"
-  },
-  "content.modpack-card.dismiss-hint": {
-    "defaultMessage": "Ne mutasd többször"
-  },
   "content.page-layout.additional-content": {
     "defaultMessage": "További tartalom"
   },
diff --git a/packages/ui/src/locales/id-ID/index.json b/packages/ui/src/locales/id-ID/index.json
index 0cfc088c5..cb6897ae8 100644
--- a/packages/ui/src/locales/id-ID/index.json
+++ b/packages/ui/src/locales/id-ID/index.json
@@ -452,15 +452,6 @@
   "content.inline-backup.world-label": {
     "defaultMessage": "dunia"
   },
-  "content.modpack-card.content-hint-description": {
-    "defaultMessage": "Konten paket mod Anda kini dapat ditemukan di sini!"
-  },
-  "content.modpack-card.content-hint-title": {
-    "defaultMessage": "Konten paket mod telah berpindah"
-  },
-  "content.modpack-card.dismiss-hint": {
-    "defaultMessage": "Jangan tampilkan lagi"
-  },
   "content.page-layout.additional-content": {
     "defaultMessage": "Konten tambahan"
   },
@@ -2997,4 +2988,3 @@
     "defaultMessage": "Anda memiliki perubahan yang belum tersimpan."
   }
 }
-
diff --git a/packages/ui/src/locales/it-IT/index.json b/packages/ui/src/locales/it-IT/index.json
index 5fb99d2ea..cafb0571c 100644
--- a/packages/ui/src/locales/it-IT/index.json
+++ b/packages/ui/src/locales/it-IT/index.json
@@ -512,15 +512,6 @@
   "content.inline-backup.world-label": {
     "defaultMessage": "mondo"
   },
-  "content.modpack-card.content-hint-description": {
-    "defaultMessage": "I contenuti del tuo pacchetto ora si trovano qui!"
-  },
-  "content.modpack-card.content-hint-title": {
-    "defaultMessage": "Contenuti del pacchetto spostati"
-  },
-  "content.modpack-card.dismiss-hint": {
-    "defaultMessage": "Non mostrare più"
-  },
   "content.page-layout.additional-content": {
     "defaultMessage": "Contenuto aggiuntivo"
   },
diff --git a/packages/ui/src/locales/ja-JP/index.json b/packages/ui/src/locales/ja-JP/index.json
index bb6499f3a..19ea1387c 100644
--- a/packages/ui/src/locales/ja-JP/index.json
+++ b/packages/ui/src/locales/ja-JP/index.json
@@ -473,15 +473,6 @@
   "content.inline-backup.world-label": {
     "defaultMessage": "ワールド"
   },
-  "content.modpack-card.content-hint-description": {
-    "defaultMessage": "あなたのModパックのコンテンツは、こちらで確認できます！"
-  },
-  "content.modpack-card.content-hint-title": {
-    "defaultMessage": "Modパックのコンテンツは移動しました"
-  },
-  "content.modpack-card.dismiss-hint": {
-    "defaultMessage": "再度表示しない"
-  },
   "content.page-layout.additional-content": {
     "defaultMessage": "追加のコンテンツ"
   },
diff --git a/packages/ui/src/locales/ko-KR/index.json b/packages/ui/src/locales/ko-KR/index.json
index 72857bb11..77ab73d90 100644
--- a/packages/ui/src/locales/ko-KR/index.json
+++ b/packages/ui/src/locales/ko-KR/index.json
@@ -533,15 +533,6 @@
   "content.inline-backup.world-label": {
     "defaultMessage": "세계"
   },
-  "content.modpack-card.content-hint-description": {
-    "defaultMessage": "여기서 모드팩의 콘텐츠를 확인할 수 있습니다!"
-  },
-  "content.modpack-card.content-hint-title": {
-    "defaultMessage": "모드팩 콘텐츠 이동됨"
-  },
-  "content.modpack-card.dismiss-hint": {
-    "defaultMessage": "다시 보지 않기"
-  },
   "content.page-layout.additional-content": {
     "defaultMessage": "추가 콘텐츠"
   },
diff --git a/packages/ui/src/locales/ms-MY/index.json b/packages/ui/src/locales/ms-MY/index.json
index c9eed0c55..dfc813e40 100644
--- a/packages/ui/src/locales/ms-MY/index.json
+++ b/packages/ui/src/locales/ms-MY/index.json
@@ -437,15 +437,6 @@
   "content.inline-backup.world-label": {
     "defaultMessage": "dunia"
   },
-  "content.modpack-card.content-hint-description": {
-    "defaultMessage": "Kandungan pek mod anda kini boleh didapati di sini!"
-  },
-  "content.modpack-card.content-hint-title": {
-    "defaultMessage": "Kandungan pek mod telah berpindah"
-  },
-  "content.modpack-card.dismiss-hint": {
-    "defaultMessage": "Jangan tunjukkan lagi"
-  },
   "content.page-layout.additional-content": {
     "defaultMessage": "Kandungan tambahan"
   },
@@ -5046,4 +5037,3 @@
     "defaultMessage": "Jenis"
   }
 }
-
diff --git a/packages/ui/src/locales/nl-NL/index.json b/packages/ui/src/locales/nl-NL/index.json
index 00d28e754..2d3dab197 100644
--- a/packages/ui/src/locales/nl-NL/index.json
+++ b/packages/ui/src/locales/nl-NL/index.json
@@ -533,15 +533,6 @@
   "content.inline-backup.world-label": {
     "defaultMessage": "wereld"
   },
-  "content.modpack-card.content-hint-description": {
-    "defaultMessage": "De inhoud van je modpack is nu hier te vinden!"
-  },
-  "content.modpack-card.content-hint-title": {
-    "defaultMessage": "Inhoud van modpack is verplaatst"
-  },
-  "content.modpack-card.dismiss-hint": {
-    "defaultMessage": "Niet opnieuw tonen"
-  },
   "content.page-layout.additional-content": {
     "defaultMessage": "Extra inhoud"
   },
diff --git a/packages/ui/src/locales/no-NO/index.json b/packages/ui/src/locales/no-NO/index.json
index 02777e931..098370c81 100644
--- a/packages/ui/src/locales/no-NO/index.json
+++ b/packages/ui/src/locales/no-NO/index.json
@@ -383,15 +383,6 @@
   "content.inline-backup.world-label": {
     "defaultMessage": "verden"
   },
-  "content.modpack-card.content-hint-description": {
-    "defaultMessage": "Modpakkeinnholdet ditt kan nå bli funnet her!"
-  },
-  "content.modpack-card.content-hint-title": {
-    "defaultMessage": "Modpakkeinnhold flytta"
-  },
-  "content.modpack-card.dismiss-hint": {
-    "defaultMessage": "Ikke vis igjen"
-  },
   "content.page-layout.additional-content": {
     "defaultMessage": "Yttligere innhold"
   },
@@ -2790,4 +2781,3 @@
     "defaultMessage": "Du har ulagrede endringer."
   }
 }
-
diff --git a/packages/ui/src/locales/pl-PL/index.json b/packages/ui/src/locales/pl-PL/index.json
index bb39ed9f4..6d6d9abb6 100644
--- a/packages/ui/src/locales/pl-PL/index.json
+++ b/packages/ui/src/locales/pl-PL/index.json
@@ -533,15 +533,6 @@
   "content.inline-backup.world-label": {
     "defaultMessage": "Twój świat"
   },
-  "content.modpack-card.content-hint-description": {
-    "defaultMessage": "Informacje o zawartości Twojej paczki modów możesz teraz znaleźć tutaj!"
-  },
-  "content.modpack-card.content-hint-title": {
-    "defaultMessage": "Zawartość paczek modów została przeniesiona"
-  },
-  "content.modpack-card.dismiss-hint": {
-    "defaultMessage": "Nie pokazuj ponownie"
-  },
   "content.page-layout.additional-content": {
     "defaultMessage": "Dodatkowa zawartość"
   },
diff --git a/packages/ui/src/locales/pt-BR/index.json b/packages/ui/src/locales/pt-BR/index.json
index b9a6794dd..4bd6a2da0 100644
--- a/packages/ui/src/locales/pt-BR/index.json
+++ b/packages/ui/src/locales/pt-BR/index.json
@@ -533,15 +533,6 @@
   "content.inline-backup.world-label": {
     "defaultMessage": "mundo"
   },
-  "content.modpack-card.content-hint-description": {
-    "defaultMessage": "O conteúdo do seu pacote de mods agora pode ser encontrado aqui!"
-  },
-  "content.modpack-card.content-hint-title": {
-    "defaultMessage": "Conteúdo do pacote de mods movido"
-  },
-  "content.modpack-card.dismiss-hint": {
-    "defaultMessage": "Não mostrar novamente"
-  },
   "content.page-layout.additional-content": {
     "defaultMessage": "Conteúdo adicional"
   },
diff --git a/packages/ui/src/locales/pt-PT/index.json b/packages/ui/src/locales/pt-PT/index.json
index c76e91666..b047df532 100644
--- a/packages/ui/src/locales/pt-PT/index.json
+++ b/packages/ui/src/locales/pt-PT/index.json
@@ -350,15 +350,6 @@
   "content.inline-backup.shift-click-hint": {
     "defaultMessage": "Pressiona Shift enquanto clicas para saltar a confirmação."
   },
-  "content.modpack-card.content-hint-description": {
-    "defaultMessage": "O conteúdo do teu modpack agora pode ser encontrado aqui!"
-  },
-  "content.modpack-card.content-hint-title": {
-    "defaultMessage": "Conteúdo do modpack foi movido"
-  },
-  "content.modpack-card.dismiss-hint": {
-    "defaultMessage": "Não mostrar novamente"
-  },
   "content.page-layout.additional-content": {
     "defaultMessage": "Conteúdo adicional"
   },
@@ -2538,4 +2529,3 @@
     "defaultMessage": "Tens alterações por guardar."
   }
 }
-
diff --git a/packages/ui/src/locales/ru-RU/index.json b/packages/ui/src/locales/ru-RU/index.json
index 48d508f97..3719b1e3c 100644
--- a/packages/ui/src/locales/ru-RU/index.json
+++ b/packages/ui/src/locales/ru-RU/index.json
@@ -506,15 +506,6 @@
   "content.inline-backup.world-label": {
     "defaultMessage": "мир"
   },
-  "content.modpack-card.content-hint-description": {
-    "defaultMessage": "Теперь он находится здесь!"
-  },
-  "content.modpack-card.content-hint-title": {
-    "defaultMessage": "Контент сборки перемещён"
-  },
-  "content.modpack-card.dismiss-hint": {
-    "defaultMessage": "Больше не показывать"
-  },
   "content.page-layout.additional-content": {
     "defaultMessage": "Дополнительный контент"
   },
diff --git a/packages/ui/src/locales/sr-CS/index.json b/packages/ui/src/locales/sr-CS/index.json
index 707e71a74..535d269f4 100644
--- a/packages/ui/src/locales/sr-CS/index.json
+++ b/packages/ui/src/locales/sr-CS/index.json
@@ -533,15 +533,6 @@
   "content.inline-backup.world-label": {
     "defaultMessage": "svet"
   },
-  "content.modpack-card.content-hint-description": {
-    "defaultMessage": "Sadržaj tvog modpacka sada možeš pronaći ovde!"
-  },
-  "content.modpack-card.content-hint-title": {
-    "defaultMessage": "Sadržaj modpacka pomeren"
-  },
-  "content.modpack-card.dismiss-hint": {
-    "defaultMessage": "Ne prikazuj ponovo"
-  },
   "content.page-layout.additional-content": {
     "defaultMessage": "Dodatni sadržaj"
   },
@@ -5802,4 +5793,3 @@
     "defaultMessage": "Tip"
   }
 }
-
diff --git a/packages/ui/src/locales/sv-SE/index.json b/packages/ui/src/locales/sv-SE/index.json
index 559b3745e..3337a40da 100644
--- a/packages/ui/src/locales/sv-SE/index.json
+++ b/packages/ui/src/locales/sv-SE/index.json
@@ -506,15 +506,6 @@
   "content.inline-backup.world-label": {
     "defaultMessage": "värld"
   },
-  "content.modpack-card.content-hint-description": {
-    "defaultMessage": "Modpaketets innehåll kan nu ses här!"
-  },
-  "content.modpack-card.content-hint-title": {
-    "defaultMessage": "Modpaketets innehåll flyttades"
-  },
-  "content.modpack-card.dismiss-hint": {
-    "defaultMessage": "Visa inte igen"
-  },
   "content.page-layout.additional-content": {
     "defaultMessage": "Ytterligare innehåll"
   },
@@ -3837,4 +3828,3 @@
     "defaultMessage": "Typ"
   }
 }
-
diff --git a/packages/ui/src/locales/tr-TR/index.json b/packages/ui/src/locales/tr-TR/index.json
index 8635158bc..aca41463c 100644
--- a/packages/ui/src/locales/tr-TR/index.json
+++ b/packages/ui/src/locales/tr-TR/index.json
@@ -530,15 +530,6 @@
   "content.inline-backup.world-label": {
     "defaultMessage": "dünya"
   },
-  "content.modpack-card.content-hint-description": {
-    "defaultMessage": "Mod paketinizin içeriği artık burada bulunabilir!"
-  },
-  "content.modpack-card.content-hint-title": {
-    "defaultMessage": "Mod paketi içeriği taşındı"
-  },
-  "content.modpack-card.dismiss-hint": {
-    "defaultMessage": "Bir daha gösterme"
-  },
   "content.page-layout.additional-content": {
     "defaultMessage": "Fazladan içerik"
   },
diff --git a/packages/ui/src/locales/uk-UA/index.json b/packages/ui/src/locales/uk-UA/index.json
index b99fd0ca3..144d90716 100644
--- a/packages/ui/src/locales/uk-UA/index.json
+++ b/packages/ui/src/locales/uk-UA/index.json
@@ -530,15 +530,6 @@
   "content.inline-backup.world-label": {
     "defaultMessage": "світ"
   },
-  "content.modpack-card.content-hint-description": {
-    "defaultMessage": "Уміст вашої збірки тепер можна знайти тут!"
-  },
-  "content.modpack-card.content-hint-title": {
-    "defaultMessage": "Уміст збірки перемістився"
-  },
-  "content.modpack-card.dismiss-hint": {
-    "defaultMessage": "Не показувати знову"
-  },
   "content.page-layout.additional-content": {
     "defaultMessage": "Додатковий уміст"
   },
diff --git a/packages/ui/src/locales/vi-VN/index.json b/packages/ui/src/locales/vi-VN/index.json
index 2a4b8c18f..f32d2905d 100644
--- a/packages/ui/src/locales/vi-VN/index.json
+++ b/packages/ui/src/locales/vi-VN/index.json
@@ -479,15 +479,6 @@
   "content.inline-backup.world-label": {
     "defaultMessage": "thế giới"
   },
-  "content.modpack-card.content-hint-description": {
-    "defaultMessage": "Nội dung modpack của bạn hiện đã có ở đây!"
-  },
-  "content.modpack-card.content-hint-title": {
-    "defaultMessage": "Nội dung modpack đã được di chuyển"
-  },
-  "content.modpack-card.dismiss-hint": {
-    "defaultMessage": "Không hiển thị lại"
-  },
   "content.page-layout.additional-content": {
     "defaultMessage": "Mod bổ sung"
   },
@@ -5094,4 +5085,3 @@
     "defaultMessage": "Đội ngũ Modrinth"
   }
 }
-
diff --git a/packages/ui/src/locales/zh-CN/index.json b/packages/ui/src/locales/zh-CN/index.json
index 7279f5a2c..cf5f5e1ad 100644
--- a/packages/ui/src/locales/zh-CN/index.json
+++ b/packages/ui/src/locales/zh-CN/index.json
@@ -533,15 +533,6 @@
   "content.inline-backup.world-label": {
     "defaultMessage": "世界"
   },
-  "content.modpack-card.content-hint-description": {
-    "defaultMessage": "你现在可以在这里找到你的整合包内容！"
-  },
-  "content.modpack-card.content-hint-title": {
-    "defaultMessage": "整合包内容已移动"
-  },
-  "content.modpack-card.dismiss-hint": {
-    "defaultMessage": "不再显示"
-  },
   "content.page-layout.additional-content": {
     "defaultMessage": "附加内容"
   },
@@ -5802,4 +5793,3 @@
     "defaultMessage": "类型"
   }
 }
-
diff --git a/packages/ui/src/locales/zh-TW/index.json b/packages/ui/src/locales/zh-TW/index.json
index 93e74a5aa..ff81de7bd 100644
--- a/packages/ui/src/locales/zh-TW/index.json
+++ b/packages/ui/src/locales/zh-TW/index.json
@@ -533,15 +533,6 @@
   "content.inline-backup.world-label": {
     "defaultMessage": "世界"
   },
-  "content.modpack-card.content-hint-description": {
-    "defaultMessage": "你模組包的內容現在可以在這裡找到了！"
-  },
-  "content.modpack-card.content-hint-title": {
-    "defaultMessage": "模組包內容已移動"
-  },
-  "content.modpack-card.dismiss-hint": {
-    "defaultMessage": "不再顯示"
-  },
   "content.page-layout.additional-content": {
     "defaultMessage": "額外內容"
   },
@@ -5802,4 +5793,3 @@
     "defaultMessage": "類型"
   }
 }
-
diff --git a/packages/ui/src/providers/auth.ts b/packages/ui/src/providers/auth.ts
index b9de5eb62..5c8613ed6 100644
--- a/packages/ui/src/providers/auth.ts
+++ b/packages/ui/src/providers/auth.ts
@@ -4,13 +4,21 @@ import type { Ref } from 'vue'
 import { createContext } from './create-context'
 
 export type AuthUser = Labrinth.Users.v2.User | Labrinth.Users.v3.User
+export type AuthFlow = 'sign-in' | 'sign-up'
+export type AuthRequestOptions = {
+	showModal?: boolean
+}
 
 export interface AuthProvider {
 	session_token: Ref<string | null>
 	user: Ref<AuthUser | null>
 	/** True once the initial auth check has completed (regardless of result). */
 	isReady?: Ref<boolean>
-	requestSignIn: (redirectPath: string) => void | Promise<void>
+	requestSignIn: (
+		redirectPath: string,
+		flow?: AuthFlow,
+		options?: AuthRequestOptions,
+	) => void | Promise<void>
 }
 
 export const [injectAuth, provideAuth] = createContext<AuthProvider>('root', 'auth')
diff --git a/packages/ui/src/stories/notifications/NotificationToasts.stories.ts b/packages/ui/src/stories/notifications/NotificationToasts.stories.ts
index c17054e12..61dc446b2 100644
--- a/packages/ui/src/stories/notifications/NotificationToasts.stories.ts
+++ b/packages/ui/src/stories/notifications/NotificationToasts.stories.ts
@@ -60,8 +60,8 @@ export const FigmaExamples: Story = {
 					type="instance-invite"
 					actor-name="Fetch"
 					:actor-avatar-url="avatarUrl"
-					entity-name="New Creation"
 					:entity-icon-url="instanceIconUrl"
+					entity-name="New Creation"
 					@accept="noop"
 					@decline="noop"
 					@dismiss="noop"
diff --git a/packages/ui/src/stories/sharing/InvitePlayersModal.stories.ts b/packages/ui/src/stories/sharing/InvitePlayersModal.stories.ts
new file mode 100644
index 000000000..ec69a691f
--- /dev/null
+++ b/packages/ui/src/stories/sharing/InvitePlayersModal.stories.ts
@@ -0,0 +1,202 @@
+import type { Labrinth } from '@modrinth/api-client'
+import type { Meta, StoryObj } from '@storybook/vue3-vite'
+import { ref } from 'vue'
+
+import ButtonStyled from '../../components/base/ButtonStyled.vue'
+import InvitePlayersModal from '../../components/sharing/invite-players-modal/index.vue'
+import type {
+	InviteLinkSettings,
+	InvitePlayersInvitePayload,
+	InvitePlayersUser,
+	InvitePlayersUserStatus,
+} from '../../components/sharing/invite-players-modal/types'
+
+const apiUsers: Labrinth.Users.v3.SearchUser[] = [
+	{
+		id: 'geometrically',
+		username: 'Geometrically',
+		avatar_url:
+			'https://cdn.modrinth.com/user/u6dRKJwZ/7ba3bdb11590a64843e9d2ab83ef85eaab42ec8e.png',
+	},
+	{
+		id: 'prospector',
+		username: 'Prospector',
+		avatar_url:
+			'https://cdn.modrinth.com/user/PHyAPGui/30a3a3f53866531831db4aa006794e6bbcfc4121.png',
+	},
+	{
+		id: 'fetch',
+		username: 'Fetch',
+		avatar_url:
+			'https://cdn.modrinth.com/user/yol4bNw3/ee2c7a7580ed475cfe3cfe8cc92df45ce33031e0.png',
+	},
+	{
+		id: 'imb11',
+		username: 'IMB11',
+		avatar_url: null,
+	},
+	{
+		id: 'josh',
+		username: 'Josh',
+		avatar_url: null,
+	},
+	{
+		id: 'emma',
+		username: 'Emma',
+		avatar_url: null,
+	},
+]
+
+const friendStatuses: Record<string, InvitePlayersUserStatus> = {
+	geometrically: 'added',
+	fetch: 'pending',
+}
+
+const meta = {
+	title: 'Sharing/InvitePlayersModal',
+	component: InvitePlayersModal,
+	parameters: {
+		layout: 'centered',
+		docs: {
+			description: {
+				component:
+					'Invite players modal for app instance sharing and server player invites. Callers provide the user search proxy and own invite/cancel persistence.',
+			},
+		},
+	},
+} satisfies Meta<typeof InvitePlayersModal>
+
+export default meta
+type Story = StoryObj<typeof meta>
+
+function toInviteUser(
+	user: Labrinth.Users.v3.SearchUser,
+	status: InvitePlayersUserStatus = 'available',
+): InvitePlayersUser {
+	return {
+		id: user.id,
+		username: user.username,
+		avatarUrl: user.avatar_url,
+		status,
+		online: user.id === 'prospector',
+	}
+}
+
+function createFriends() {
+	return apiUsers
+		.slice(0, 4)
+		.map((user) => toInviteUser(user, friendStatuses[user.id] ?? 'available'))
+}
+
+function createSearchUsers() {
+	return apiUsers.map((user) => ({
+		id: user.id,
+		username: user.username,
+		avatarUrl: user.avatar_url,
+	}))
+}
+
+function createRender(args: Record<string, unknown>) {
+	return {
+		components: { ButtonStyled, InvitePlayersModal },
+		setup() {
+			const modalRef = ref<InstanceType<typeof InvitePlayersModal> | null>(null)
+			const friends = ref<InvitePlayersUser[]>(createFriends())
+			const searchUsers = createSearchUsers()
+			const lastAction = ref('')
+			const invitedSearchUserIds = ref(new Set<string>())
+
+			async function updateInviteLink(settings: InviteLinkSettings) {
+				await new Promise((resolve) => setTimeout(resolve, 500))
+				lastAction.value = `Updated invite link to ${settings.maxUses} uses, expiring ${settings.expiresAt.toLocaleString()}`
+			}
+
+			async function searchInviteUsers(query: string) {
+				await new Promise((resolve) => setTimeout(resolve, 250))
+				const normalizedQuery = query.trim().toLowerCase()
+				const friendKeys = new Set(
+					friends.value.flatMap((friend) => [
+						friend.id.toLowerCase(),
+						friend.username.toLowerCase(),
+					]),
+				)
+
+				return searchUsers.filter(
+					(user) =>
+						user.username.toLowerCase().startsWith(normalizedQuery) &&
+						!friendKeys.has(user.id.toLowerCase()) &&
+						!friendKeys.has(user.username.toLowerCase()) &&
+						!invitedSearchUserIds.value.has(user.id),
+				)
+			}
+
+			function handleInvite(payload: InvitePlayersInvitePayload) {
+				const existingFriend = friends.value.find((friend) => friend.id === payload.user.id)
+
+				if (payload.source === 'search') {
+					invitedSearchUserIds.value = new Set([...invitedSearchUserIds.value, payload.user.id])
+					lastAction.value = `Sent friend request and direct invite to ${payload.user.username}`
+					return
+				}
+
+				if (existingFriend) {
+					existingFriend.status = 'pending'
+				}
+
+				lastAction.value = `Invited ${payload.user.username} from ${payload.source}`
+			}
+
+			function handleCancel(user: InvitePlayersUser) {
+				const existingFriend = friends.value.find((friend) => friend.id === user.id)
+
+				if (existingFriend) existingFriend.status = 'available'
+				lastAction.value = `Cancelled invite for ${user.username}`
+			}
+
+			return {
+				args,
+				friends,
+				handleCancel,
+				handleInvite,
+				lastAction,
+				modalRef,
+				searchInviteUsers,
+				updateInviteLink,
+			}
+		},
+		template: /* html */ `
+			<div class="flex flex-col items-center gap-4">
+				<ButtonStyled color="brand">
+					<button @click="modalRef?.show($event)">Open modal</button>
+				</ButtonStyled>
+				<p v-if="lastAction" class="m-0 text-sm text-secondary">{{ lastAction }}</p>
+				<InvitePlayersModal
+					ref="modalRef"
+					v-bind="args"
+					:friends="friends"
+					:search-users="searchInviteUsers"
+					:update-invite-link="updateInviteLink"
+					@invite="handleInvite"
+					@cancel="handleCancel"
+				/>
+			</div>
+		`,
+	}
+}
+
+export const ShareInstance: Story = {
+	args: {
+		header: 'Share instance',
+		link: 'https://modrinth.com/instance/abc123',
+		linkExpiresAt: new Date(Date.now() + 7 * 86_400_000).toISOString(),
+		linkMaxUses: 10,
+	},
+	render: (args) => createRender(args),
+}
+
+export const FriendsOnly: Story = {
+	args: {
+		header: 'Invite players',
+	},
+	render: (args) => createRender(args),
+}
diff --git a/turbo.jsonc b/turbo.jsonc
index ba7d7b2fc..52c272777 100644
--- a/turbo.jsonc
+++ b/turbo.jsonc
@@ -10,6 +10,7 @@
 	"globalEnv": [
 		"MODRINTH_URL",
 		"MODRINTH_API_BASE_URL",
+		"SHARED_INSTANCES_API_BASE_URL",
 		"MODRINTH_ARCHON_BASE_URL",
 		"VITE_STRIPE_PUBLISHABLE_KEY"
 	],