Some update sets are loaded and the state remains at "Previewing" with no "Commit Update Set" button available.
This issue can be caused by an old version of the "UpdateSetPreviewer" script include.
Customization can prevent users from completing this update, while upgrading to Kingston from older releases of the platform.
Convert the "UpdateSetPreviewer" script include to the out-of-box version:
- Go to System Diagnostics -> Upgrade History
- Open the record for the upgrade to Kingston.
- Under the Skipped Changes to Review tab, search for Target Name = 'UpdateSetPreviewer'
- Open the record and click the "Reverse to Base System" button