If your skin is not working, do either:
In your Automobilista 2 folder > Vehicles > Textures > CustomLiveries > Overrides :
If there's a folder 'F1 2026' and 'formula_ultimate_2024.xml' file inside 'Overrides', move both to 'formula_ultimate_2024' folder, which is in the same place.
Or just do this:
Remove this 'F1 2026' and 'formula_ultimate_2024.xml' inside 'Overrides' and download the most recent version, it will work now.
In this case, extract the new 'f12026skinpack.rar', move 'UserData' and 'Vehicles' inside your Automobilista 2.