I tried to make an ENB for gta IV to make Iv's graphics just like GTA V and here's the results:
This ENB make your game just like Gta V specially clouds.

Gta IV: Tested on 1.0.7.0
Gta EFLC: Tested on 1.1.2.0

Tested in:
CPU: Intel Core i5
VGA: 1 GB Radeon HD
RAM: 4 GB DDR 3

Visit my website for more mods.