You are free to move the custom configurations back to the vehicles folder if all goes well.

Finally, launch the game again and try spawning the Mustang.

It's the same as clearing cache, except that you won't have to use the option on the launcher as that will also verify integrity, whereas simply deleting the folder doesn't. If it's not there to begin with, then move on to the next step. Consider moving it elsewhere if you have custom configurations saved, but otherwise, delete it.

Next, go to the vehicles folder, and look for a folder named 's550', which is the internal name for the mod.

Here, the file name for my version is 's550.zip', which is the same as the last public build released within this thread. Be sure to check for the file names as some versions may be named differently. Ensure that you have all other builds of the mod completely removed as they will conflict with my version. If the issue persists, then you will need to manually clean all traces of the mod, so move on to the next step. If it doesn't load after more than a minute or so, then force reset the vehicle with Ctrl+R.

The PBR paint materials may take a while to load.

If you're having issues with the paint after installing the latest update of my version of the mod, then please try the following:

I was unable to recreate it on any of the computers that I own, as I stated earlier.

More and more people have reported that the paint isn't working on their end.

Beamng ford mustang