Hey mate, I just tested your skin packs and they all wouldn't load for me, I got an error message when starting the game and only the wet version showed up in the tracks list, day and night version didn't (using the official Kunos launcher).
I did some research and found the solution. For the Kunos launcher version you need to edit all ui_track.json files (day and night only, wet is fine).
And the specific line you need to change is the year line.
You just have to remove the comma behind 2018 and then all track configurations show up ingame.
It would be great if you could update those files because in the review section I've seen people who also suffered from this problem.