Patch 1.8 changed the way custom liveries work in ACC. This new version has fixed resolution and includes the _1.dds files to immediately work in every race session. No more custom livery join freeze / lag when having this version in your folder!
Once you download and unpack, and then look into the Showroom for the car, the game will freeze shortly to create the _0.dds full resolution version. This is only for Showroom and is not included in the pack as it is to big in file size.