Installation:
1. Extract Files from "GTA IV to V - Version 2" -->"Classic Look" to your GTA IV/EFLC main folder - 

GTA IV
Retail: C:/Program Files/Rockstar Games/Grand Theft Auto IV
Steam: C:/Program Files/Steam/steamapps/common/Grand Theft Auto IV/GTA IV

EFLC
Retail: C:/Program Files/Rockstar Games/EFLC
Steam: C:/Program Files/Steam/steamapps/common/Grand Theft Auto IV Episodes from Liberty City\EFLC

2. Choose a Look! Just test the Settings. 