Schrëtt 1: Dir öffnet cmd (lafen als Administrateur), then you type
dism /online /get-targeteditions
You will see Windows Server 2019 editions you can upgrade
Schrëtt 2: You copy and paste this code in cmd
If you want to upgrade to Windows Server 2019 Datacenter Dir Typ:
dism /online /set-edition:serverdatacenter /productkey:XXXXX-XXXXX-XXXXX-XXXXX-XXXXX /accepteula
Note:
wann Dir gesitt "Upgrade gescheitert", Dir restart Äre Windows Server 2019. It will upgrade Windows Server 2019 Evaluation to Datacenter.