Is it possible to downgrade Windows Server 2016 Datacenter to Standard?
Solution 1:
Didn't tried it in 2016, but;
DISM /online /Get-CurrentEdition
to know the version and after;
DISM /online /Get-TargetEditions
to know what it can be switched to, and after try
DISM /online /Set-Edition:<Version> /ProductKey:XXXXX-XXXXX-XXXXX-XXXXX-XXXXX /AcceptEULA