GamesCom is Europes biggest expo for interactive games and entertainment. It's organised by Bundesverband Interaktive Unterhaltungssoftware (BIU or in English German Federal Association of Interactive Entertainment Software).
How to install is in README BACKUP FIRST THE FILES THAT YOU MUST REPLACE
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1: Extract the rar file
2: Copy the family_v.p3d file in Simpsons Hit and Run directory\art\cars and replace the old one
3: Have fun
BACKUP THE FILES THAT YOU MUST REPLACE!!!!