Some of the basic questions and answers when dealing with apps. Q: How do I install apps ? It is a good practice to check the apps' archive first. A1: If it contains a folder named "apps", then you just need to drop it under \STEAM\steamapps\common\assettocorsa\ A2: If it contains a folder named as the app, then you need to drop it under \STEAM\steamapps\common\assettocorsa\apps\python Q: I've copied the app in the respective folder, but it's not showing ingame. A: Any app you install, must be first activated ingame: Options > General, and check the box next to the app. Q: I want to activate the app in Options, but it doesn't show in the list A: Check first instruction, you probably didn't copied the app in the right place. Q: I would like to get into app developing. Where should I start ? A: You can start by having a look at Shared Mem Reference , Python Doc and THIS tutorial.