Install the latest version of GTA IV from Steam or the Rockstar Games Launcher. Use a Downgrader Tool: Use a community-verified tool like the GTA IV Downgraders to revert your game files to version 1.0.4.0. Apply the Patch:

If you own the game on Steam, you don't need a crack. You just need the original executables.

Are you having trouble with after downgrading?

: A trusted host for the 1.0.4.0 installer used by the speedrunning community for consistent game behavior. The GTA Place