Symptoms

When updating Universal Plugin Manager, the "Downloading and Installing" dialog never completes.

However, when the user refreshes or opens a new tab to Manage Add-ons page, it shows it had already been installed.

Cause

This is caused by a bug in UPM 2.16.2. See  Unable to locate Jira server for this macro. It may be due to Application Link configuration.  for more information. 

Workaround

The UPM update has succeeded and refreshing the page will confirm this (either by displaying the new version string in the footer, or by no longer showing the "UPM update available" notification banner. This is a one-time front-end bug which customers may encounter now but will not encounter in the future.

Resolution

See workaround. Once version 2.16.2 is reached future updates should not encounter the error.