Reset RD Licensing grace period (120 days)

 

For test/evaluation purposes only!
The official solution is to Activate the RDS/TS CAL License server and point the Server to License server with User/Device License.

But if you want to reset the timer and have another 120 days grace period,  here is the solution:

Delete the REG_BINARY in
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\GracePeriod
Leave the (Default) regkey

Note: you must take ownership and give admin users full control to be able to delete this key.

After a reboot the server should be working again for another 120 Days.