I am a Windows Insider MVP and work on Microsoft Community. Often I am seeing that the users with Kaspersky Total security have troubles upgrading to 2004. Example:
The log files clearly mention Kaspersky was the culprit and it appears to be a permissions error.
2020-09-11 11:13:34, Error MIG Error 5 while applying object HKCU\Software\KasperskyLab\AVP20.0. Shell application requested abort
Is it under the radar of the team of Kaspersky? There is a link of the log files if anyone wants to have a look.