I have just installed renguard and it does the checks. Then says the error :
There are errors. Disconnecting!
It then brings the screen :
Core Patch Pre-Checks
RenGuard has detected corrupt files. In order to install Core patch 2, you need to download fixed copies and extract them to your renegade directory. Mix files (maps) belong to the data directory.
Click on those download links, unzip the files and put their contents in your Renegade/data directory to overwrite your files that do not match our expected profile, and when you are done restart RenGuard.