Could you create an archive with the correct directory structure so there's no guessing where this skin is to be installed? I spent about five minutes, looking at my various Kunos and other M3s trying to figure it out. It only takes a minute or two to create a mod archive for downloading that includes the structure assettocorsa/content/car/-carfoldername-/skins.
I downloaded about 20 new mods today, most with the correct structure, that installed with little or no additional effort (I install everything manually). Got to this one, and I probably just need to throw it away as I give up trying to figure out where it goes, which is a shame. It looks like you did a good job, and I'd like to see it on the correct car.
[EDIT] I figured it out, scrolled down my list far enough to find it. So the structure within the download RAR or Zip should have assettocorsa/content/cars/bmw_m3_e30_gra/skins.
