The base didn't change so if you downloaded it before you do not have to download it again. I basically replaced the merged layer on the old file (headlights, shading, rims, etc.) with a different layer that ought to work better. Before I just merged all visible layers remaining, which is why it looks weird in the render.
I also updated it with a newer credit layer which includes the link to the Camaro template I used in case any wanted to download it. Other then those two things, the base layers themselves are the same.