Open a command console or powershell as administrator and run the following
DISM /online /Set-Edition:ServerDataCenter /AcceptEula /Productkey:74YFP-3QFB3-KQT8W-PMXWJ-7M648
The key is a KMS key.
The server will reboot twice.
Open a command console or powershell as administrator and run the following
DISM /online /Set-Edition:ServerDataCenter /AcceptEula /Productkey:74YFP-3QFB3-KQT8W-PMXWJ-7M648
The key is a KMS key.
The server will reboot twice.