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Try:
1. Download RDP Wrapper installer (RDPWInst), place in Downloads directory
2. Get latest INI file (official one) and place it in the same directory (do not touch INI file in Program Files)
3. Open RDPConf and write down your termsrv.dll build number from there (not the OS version)
4. Make sure the INI file (from point 2) has matching sections (from point 3)
5. If sections are missing, look them up on rdpwrap GitHub issues and add manually into INI, also make sure all referenced patch codes are in place (can grab from seba's fork)
6. Open CMD as Administrator
7. Change directory in CMD to where the files located (from points 1, 2)
8. RDPWinst -u -k
9. RDPWinst -i (do not use install.bat)
Then perform connection checks again.