For unitedracingdesign's Red Bull X2010:
Just a quick edit i made.
Go to your Assetto Corsa folder and go to: content > cars > urd_redbull_x2010/urd_redbull_x2010_s1 > skins, then drop the 'carbon' folder into it.
Pure Carbon Livery For Red Bull X2010 4K/2K v1.1
For unitedracingdesign's Red Bull X2010