Hey mate! Yeah, CM does not usually install skins quite nicely. Open the .ZIP file and click on the folders until it says "content." Once there, select it and copy it to paste it into your game directory (the Assetto Corsa game files located on your computer, right when you enter into the 'assettocorsa' file). Your Assetto Corsa should be located in your Steam Library in the storage device that you chose (e.x. D:/SteamLibrary/steamapps/common/assettocorsa). Once there, paste the "content" folder into your game and it should work. Remember to select it when starting a session in Content Manager as well! If you have any further questions, you can come over to the "Ask a question" tab on this resource.
The Track Skin 2.0.0 is an updated version of this skin that includes the new sponsors added today in practice 1/2, I just included the "new" skin on the same page because they are quite similar. 2.1.0 is a quick hotfix for the Heineken board that was bugging me. Sorry about the fast updates I guess! :)
Thanks for the review, hope that helps! :)