- unzip the downloaded files
- go to your cars folder: ...\SteamApps\common\assettocorsa\content\cars
- search the right car
- go to the skins folder and paste the unziped folder here
- Alternative: go to the skins folder, paste the downloaded file and unzip it
BMW 1M Skinpack 1.0
3 Skins for the BMW 1M (S3).