It looks like you’re trying to figure out how to get Payday 2 running with a specific cracked setup (FitGirl repack) while playing online (multiplayer) on Steam.
By nature, these versions lack native access to Steam’s multiplayer servers, often requiring complex "MP fixes" that are prone to breaking. The Performance and Stability Divide payday2 sp steam mp fitgirl repack top
How does one play online w/ a Fitgirl repack? : r/PiratedGames It looks like you’re trying to figure out