To convert Grand Theft Auto IV (GTA 4) into a version that looks and plays like Grand Theft Auto V (GTA 5) , you'll need to install a series of mods that overhaul the graphics, mechanics, and character assets. This process involves upgrading the visual fidelity, adding GTA 5-style vehicles, and implementing specific script mods to mimic the newer game's features.
Check out this step-by-step tutorial on converting GTA 4 into GTA 5 using various mods: To convert Grand Theft Auto IV (GTA 4)