The very first step is to view the current edition.
Windows server 2012 r2 standard evaluation activator.
Following command will rearm your trial windows server 2012 r2.
The list of kms keys which should be used for window server 2012 r2 and windows 8 on kms server.
You can rearm windows server 2012 r2 evaluation up to 5 times.
Kms keys for windows 8 1 and windows server 2012 r2.
After the update and the new key installation your kms server will support client kms activation for all windows versions from vista up to win 8 1 2012 r2.
First you must convert to a full retail version.
Run command prompt with administrator privileges and run following command.
As you can see the current edition is datacenter evaluation.
Windows will reconfigure itself.
Activate windows server 2012 evaluation to full version.
So open command prompt or windows powershell in elevated mode run as administrator and type dism online get currentediton as shown below.
Then reboot your server.
The edition will change from windows server 2012 r2 standard evaluation to windows server 2012 r2 standard.
Windows server 2012 r2 evaluation is valid for 180 days.
Extend windows server 2012 r2 evaluation.
If you license is genuine and your server is connected to the internet you should be able to validate your license.