You can find the original script here. Authors are ZAZ and Retrkill0, the original file was uploaded by Dimon_gta.
In my gameplaying, this script caused a problem when the first gang war mission 'Dobermann' started, it has no any Ballas members on Glen Park area, and the game will crash if I try to pull some Ballas guys out from car and kill them to provoke the gang war. So based on my problem, I removed some codes about the mission check from the script so It works fine. Now I uploaded my modified version here for people who facing the same trouble as mine.
How to Install: Remove your old script from CLEO folder first. Unzip what you download from this page and move the *.cs file to your CLEO folder. Enjoy the game.