Hi @Luca Tessaro ,
If you're not using a central store, then yes it is enough to simply copy the new .admx files from where they were installed (C:\Program Files (x86)\Microsoft Group Policy\Windows 10 October 2020 Update (20H2)\PolicyDefinitions) to the Sysvol\PolicyDefinitions folder on the domain controller(s).
The Administrative Templates (.admx) for Windows 10 October 2020 Update (20H2) are compatible/supported for both Windows Server 2012/2012R2 and up.
Note: There's also a newer version of the administrative templates (21H1) from here:
https://www.microsoft.com/en-us/download/103124
----------
If the reply was helpful please don't forget to upvote
and/or accept as answer
, thank you!
Best regards,
Leon