The zip file contains a MAS file and a USERDATA folder.
Unzip to a temporary folder.
2 ways to install:
- which gives you New UI icons
- but you have to move to new version folder when new car upgrades
copy 4horsemen.mas to "C:\Program Files (x86)\Steam\steamapps\common\rFactor 2\Installed\Vehicles\AstonMartin_Vantage_GTE_2019\1.71" or what is the lastest version of this car.
- no UI icons
- but works even when car is upgraded
Copy USERDATA folder to your game folder "C:\Program Files (x86)\Steam\steamapps\common\rFactor 2\"