Windows Server 2012 R2 Standard Build 9600 Product Key Activation

DISM /online /Set-Edition:ServerStandard /ProductKey:YOUR-PRODUCT-KEY /AcceptEula

ESU activation follows a two-step process: installing the key and then applying the update. You need to be properly licensed to receive ESUs.

DISM /online /Set-Edition:ServerStandard /ProductKey:D2N9P-3P6X9-2R39C-7RTCD-MDVJX /AcceptEula

For individual installations, the simplest approach is using the graphical interface:

Check your Microsoft Volume Licensing Service Center (VLSC) portal or purchase confirmation email.

This method is ideal if you have a single or MAK (Multiple Activation Key) product key.