Browse and select your GTAIV.exe in the game folder you moved earlier.
Before we dive in, here is why this specific version is the "Holy Grail" for fans: downgrade gta iv to 1.0.7.0
If you want to use your old saves, you will need a . Most downgraders include a link to one, but generally, it’s easier to download a "100% Completion" save file for 1.0.7.0 if you just want to mess around with mods. Step 4: Essential Post-Downgrade Fixes Browse and select your GTAIV