We're seeing the following error after the upgrade:
com.atlassian.upm.license.internal.impl.PluginLicenseManagerImpl cannot be cast to com.atlassian.upm.api.license.PluginLicenseManager
All plugins were updated, and Confluence restarted with no effect.
It sounds like you may have either encountered a new bug with the Confluence Multi-Excerpt plugin, or you are encountering a bug with the Universal Plugin Manager as described in this bug report: https://ecosystem.atlassian.net/browse/UPM-1758
Therefore, firstly I would suggest upgrading your UPM to the latest version and if that doesn't resolve your issue then I would suggest you open a new bug report with the plugin's developers. Their issue tracker can be found here:https://studio.plugins.atlassian.com/secure/IssueNavigator.jspa?sorter/field=created&sorter/order=DESC
All the best,
What version of the multi-excerpt plugin are you using?
Also what version of the UPM are you using? I'd follow John's suggestion to upgrade to the latest UPM to see if that helps.
We could also try using the .obr file (an alternative to the jar plugin installation) if the UPM upgrade doesn't work.
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