Office365

Download the Plugin for Office365

Windows

https://learn.microsoft.com/en-us/office/dev/add-ins/testing/create-a-network-shared-folder-catalog-for-task-pane-and-content-add-ins

Mac

https://learn.microsoft.com/en-us/office/dev/add-ins/testing/sideload-an-office-add-in-on-mac

https://ci-hub.azurewebsites.net/download/ci-hub.xml (Windows and Mac)

For Outlook, see this Link:

https://learn.microsoft.com/en-us/office/dev/add-ins/outlook/sideload-outlook-add-ins-for-testing?tabs=web

https://ci-hub.azurewebsites.net/download/outlook-ci-hub.xml