If the GUI is unavailable, use the Software Licensing Management Tool ( slmgr.vbs ) from an elevated Command Prompt.
One of the most common activation scenarios involves converting an to a full licensed version. When you download Windows Server 2012 R2 from Microsoft's Evaluation Center, you receive a 180-day trial. Converting to a full version requires using the Deployment Imaging Service and Management Tool (DISM) : If the GUI is unavailable, use the Software
Activating Windows Server 2012 R2 Standard (Build 9600) is a critical step to ensure your server remains functional and receives vital security updates. Whether you are using a Retail, Volume Licensing (KMS/MAK), or Evaluation version, there are several reliable ways to complete the activation process. Converting to a full version requires using the
Ensure the server has internet access to communicate with Microsoft verification servers. Method 2: Activation via Command Prompt (SLMGR) Method 2: Activation via Command Prompt (SLMGR) DISM
DISM /Online /Set-Edition:ServerStandard /ProductKey:XXXXX-XXXXX-XXXXX-XXXXX-XXXXX /AcceptEula
The activation server determined the specific product key is blocked, invalid, or over-activated.