It looks like you’re trying to combine search terms related to extending the on Windows Server 2016 using a free method (likely a patch or DLL replacement).
A: No. Microsoft never provides such patches. Any claim otherwise is a scam.
. If the patched version is incompatible with the update, Remote Desktop services may crash or fail to start. Legal/Licensing : Modifying system binaries is a violation of the Microsoft EULA
If you have already installed a termsrv.dll patch on Windows Server 2016, immediately:
Unlike direct patching, this tool acts as a layer between the Service Control Manager and Terminal Services, leaving the original termsrv.dll file untouched.