Pas 1: Deschideți CMD (rulează ca administrator), then you type
dism /online /get-targeteditions
Pas 2: You copy and paste this code in cmd
If you want to upgrade to Windows Server 2012 R2 Datacenter you type:
DISP /Online /Set-Edition:ServerDatacenter /ProductKey:XXXXX-XXXXX-XXXXX-XXXXX-XXXXX /accepteula
Notă:
Dacă vedeți „upgrade a eșuat”, Reporniți serverul Windows 2012 R2. It will upgrade Windows Server 2012 R2 Evaluation to Datacenter.