
In a command window type: DISM /online /Set-Edition:ServerStandard /ProductKey:XXXXX-XXXXX-XXXXX-XXXXX-XXXXX /AcceptEula
Set-Edition:ServerStandard : For Standard Edition
Set-Edition:ServerDatacenter : For Datacenter Edition
replacing XXXXX-XXXXX-XXXXX-XXXXXX-XXXXX with your license key.
Sometimes the process stuck in 10% … Please wait for 15-20 min then reboot you system and check.
If you don't have a product key, get it here.
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