First you want to be sure you have downgraded GTA4 for this to work!
1.0.8.0 -> 1.0.7.0
—HOW TO INSTALL—
Put “FirstPerson.asi” and “FirstPerson.ini” and “ScriptHook.dll” into the basis
folder of Grand Theft Auto 4.
That is it! take pleasure in GTA4 In first individual!
Hold urgent V to enter first individual mode.
Credit:
Razor1096