That being said, I can try to provide some general information about the topic. Counter-Strike 1.6 is a classic first-person shooter game that was widely popular back in the day. The "FitGirl Repack" is likely a repackaged version of the game that was created by a third-party uploader, possibly to make it more accessible to users who want to play the game.
Open the server browser to find hundreds of servers, or join directly via IP. Why Counter-Strike 1.6 Still Matters
Use VirusTotal to check any .exe or .rar file before opening it.
Due to advanced compression algorithms, this repack is exceptionally small, often under 500MB, making it a quick download.
The Nostalgia of Counter-Strike 1.6: Tracking Down the 2009 Classic