Extract zip to a temporary location
zip contains 2 ways to install.
drop the BrawnPetronas.mas into
. . . Steam\steamapps\common\rFactor 2\Installed\Vehicles\FormulaPro_2021\0.95
this method will give ui icons but mas file will have to be moved when the car is updated to whatever is the latest version
or drag the userdata folder to your base rfactor2 folder
. . . Steam\steamapps\common\rFactor 2\
this way will not give UI icons but will work when car is updated