Run this as Administrator:
Open Command Prompt as Administrator and type: Run this as Administrator: Open Command Prompt as
DISM /online /Set-Edition:ServerStandard /ProductKey:YOUR-PRODUCT-KEY /AcceptEula Replace ServerStandard with ServerStandardEval if needed, but typically it’s just ServerStandard. Run this as Administrator: Open Command Prompt as
No. Keys are edition-specific. A Server 2012 key (Build 9200) will not activate R2 (Build 9600). Run this as Administrator: Open Command Prompt as