Ensure the LaunchGTAIV.exe matches the downgraded version of the game you are running (e.g., 1.0.4.0, 1.0.7.0).
Paste the downloaded LaunchGTAIV.exe into your GTAIV folder, overwriting the existing file. Download LaunchGTAIV exe
Find where GTA IV is installed. For Steam, this is usually: C:\Program Files (x86)\Steam\steamapps\common\Grand Theft Auto IV\GTAIV Ensure the LaunchGTAIV
A key component of this process is obtaining a working file. Why You Need to "Download LaunchGTAIV.exe" Download LaunchGTAIV exe
Right-click the new shortcut, select "Properties," and add the following to the end of the "Target" field: -noprecache -nomemrestrict -norestrictions . Important Notes