Microsoft provides free solutions to address these issues:
bypass the 2-session limit for concurrent Remote Desktop (RDP) connections without purchasing expensive Client Access Licenses (CALs). The "Termsrv.dll" Story: How it Works Windows Server 2016 allows exactly two concurrent RDP sessions termsrvdll patch windows server 2016 free
Patching termsrv.dll on Windows Server 2016 to bypass RDS licensing violates Microsoft’s EULA and may introduce system instability or security risks. No legitimate “free patch” exists for production use. For free legal RDS access, use Windows Server 2016 Evaluation (180 days) or Windows Admin Center. Microsoft provides free solutions to address these issues:
In Windows Server 2016, termsrv.dll facilitates several functionalities: termsrv.dll facilitates several functionalities: