Great job but the installation doesn't work for me. All the skins are in the formula retro gen 2 folder but the skins don't appear in the game. I tried everything.
try this:
1) go to your Overrides folder (usually the path is C:\Program Files (x86)\Steam\steamapps\common\Automobilista 2\Vehicles\Textures\CustomLiveries\Overrides)
2) delete your f_retro_g2 and your lotus_79 folders
3) unpack the file you downloaded, which contains the 2 folders you just deleted), into your Overrides folder (C:\Program Files (x86)\Steam\steamapps\common\Automobilista 2\Vehicles\Textures\CustomLiveries\Overrides).
4) enjoy