The problem looks like the compatibility manager has not the newest information about acceptable extensions. Probably it can’t connect to the internet to get new data. Can you please check in the newest compatibility list manually and try again?
- Log on to the ePO 5.x console.
- Click Menu, Configuration, Server Settings.
- Click Product Compatibility List in the Setting Categories column, if you set this to Disabled, the XML file can be uploaded directly into ePO 5.x by browsing on your local file system.
- The file link is located on that same page.
The direct link to the online Product Compatibility List is located at: https://epo.mcafee.com/ProductCompatibilityList.xml
have a test on manual updating this. After thisworked I think you can checkin the extensions.