Community forums like r/PiratedGames on Reddit recommend only downloading from verified sites listed in their megathreads to avoid malware.
To play together, your friends must have the exact same version of the game and the same fix applied. Important Safety Tips This is a Ghost Fix Online.rar
Most online fixes require the Steam client to be running in the background to handle the connection. This is a Ghost Fix Online.rar
Playing This is a Ghost with Friends: A Guide to Online Fixes This is a Ghost Fix Online.rar