A "Rip7z" or "Repack" is a heavily compressed version of a retail video game. In the case of GTA IV, a game originally spanning multiple DVDs or massive digital downloads, data compression serves to minimize bandwidth usage.
GTA IV's physics engine breaks if your frame rate goes above 60 FPS. Use your GPU control panel (Nvidia Control Panel or AMD Radeon Software) to lock GTAIV.exe to exactly 60 FPS. This prevents broken cutscenes and unfinishable final missions. To help me tailor advice for your specific setup, tell me: gta iv rip7z work
Here is a practical guide to making that "Rip" version work and optimizing the game so it is playable. A "Rip7z" or "Repack" is a heavily compressed