For much of today the Marketplace has reported incorrect compatibility information for many Jira Server apps (formerly known as add-ons). This led customers to update to app versions which weren’t actually compatible with their Jira Server versions.
The Marketplace team is continuing work on restoring the correct compatibility data, but progress has been slower than expected. We anticipate that this situation will continue into tomorrow and we apologize for any disruption this causes you. In the meantime, in order to prevent Jira Server administrators from unknowingly installing incompatible app versions, the Marketplace team has blocked all Jira Server administrators from downloading apps through UPM. This does not affect Cloud customers, UPM in other Server products, or downloads from the Marketplace site.