Run licmgr.exe and reset the grace period up to 3 times using:
When applying universal termsrv.dll patches, keep the following best practices in mind: universal termsrvdll patch windows server 2012 r2 top
Registry indications for RDP Wrapper:
C:\Windows\System32\termsrv.dll
Proper licensing: Install the "Remote Desktop Licensing" role, activate the server, and install CALs. It costs money but provides compliance. Run licmgr