Delete all old files for the oldsfullsize (including this skin pack) and clear your game cache. Download this: https://www.beamng.com/resources/codename-oldsfullsize.1417/ Then download this: https://beamng.com/threads/american-80s-fullsize-series.44514/ Then re-download this updated skin pack.
I did that and all I got was "Fatal vehicle exception. please reload the vehicle." but then again I didn't know how to clear the cache so I skipped that. EDIT: I got it working, thanks!
The author of this mod hasn’t been online since July 18th. So I don’t think they’re going to make that skin.
I'm going to be a pain the ass and ask if this mod can be updated. When selecting any vehicle it cannot do this and automatically reverts back to another stock one. The mod dose not have a preview
This mod will be outdated soon, when i'll release the newer version of the oldsfullsize. I'll maybe look with the author to see what is needed to update it, but now, it just should be flagged outdated. I didn't tested it, i don't know if it works or not.