: If you own the modern "Complete Edition," you cannot simply install this patch. You must use a Downgrader Tool
The following tutorials demonstrate how to use automated tools to safely downgrade your GTA IV installation to version 1.0.4.0: gta iv 1.0.4.0 download
Create a commandline.txt file in your root directory. Paste these magic words for 1.0.4.0: : If you own the modern "Complete Edition,"