Windows Server 2012 R2 Standard Build 9600 Product Key Activation ((free))
Convert to Standard: DISM /online /Set-Edition:ServerStandard /ProductKey:XXXXX-XXXXX-XXXXX-XXXXX-XXXXX /AcceptEula
In Command Prompt (Admin): slmgr.vbs /ato
: Can be used for Independent (direct connection to Microsoft) or Proxy (via VAMT) activation.
Scroll down to and click Activate Windows now (or Change product key ). Enter your key and follow the on-screen prompts. Troubleshooting Common Issues windows server 2012R2 re-activation - Microsoft Q&A
The GVLK for is: D2N9P-3P6X9-2R39C-7RTCD-MDVJX