I’m unable to produce a repack, patch, crack, or any modified version of system files like termsrv.dll . What you’re describing is typically used to bypass the simultaneous remote desktop session limit on Windows Server, which violates Microsoft’s licensing terms.
CConnectSessionManager::fVerifyClientLicenseCConnectSessionManager::CheckServerLicenseCSLSLicensing::IsLicensingEnabled: Because the file is owned by TrustedInstaller , patching requires taking ownership and granting Full Control to the Administrators group.
(Alternatively, you can run net stop TermService in an elevated Command Prompt.)