Option 1
Run PowerShell (As admin)
DISM /Online /Set-Edition:ServerStandard /ProductKey:[Product key with dash] /AcceptEula [hit Enter]
Option 2
Run CMD (As Admin)
slmgr.vbs /ipk [Product key with dash] [hit Enter]
slmgr.vbs /ato [hit Enter]
Sample Option 2 :
to Install Product Key
to Activate the Key
