Microsoft Office 365 Catalina

Download previous version installer compatible with Catalina

https://officecdn.microsoft.com/pr/C1297A47-86C4-4C1F-97FA-950631F94777/MacAutoupdate/Microsoft_Office_16.55.21111400_BusinessPro_Installer.pkg

Other Versions

https://docs.microsoft.com/en-us/officeupdates/update-history-office-for-mac#release-history-for-office-for-mac

Deactivate Office 365 Mac

https://support.microsoft.com/en-us/office/how-to-remove-office-license-files-on-a-mac-b032c0f6-a431-4dad-83a9-6b727c03b193

Also terminal:

defaults write com.microsoft.Word ResetOneAuthCreds -bool YES

macOS could not be installed on your computer. Unable to unmount volume for repair.

Terminal:
sudo mv /.quota.ops.user /.quota.ops.user.orig
sudo mv /.quota.user /.quota.user.orig

Source: Apple Discussions

Safari can’t open the Page because Safari can’t establish a secure connection to the server. Chrome NET::ERR_CERT_REVOKED

Terminal:
sqlite3 ~/Library/Keychains/*/ocspcache.sqlite3 ‘DELETE FROM responses WHERE responderURI LIKE “%http://%.globalsign.com/%”;’

Source: StackExchange
Source: Apple.com Discussions