open the zip file that i sent and go into your replays folder and inside there should be another folder called "scriptai" and inside of that there should be a folder called "tracks" then past the contents of the zip into there and they should work --- Post updated --- but if you dont have the script ai and tracks folder just make them
click f11 then click window then go to gameplay and click script ai editor, pause the game and spawn in 10 cars, then click the folder icon in the script editor and for each car and choose the scripts accordingly.
Charlette roval 10 car script ai download the track here WIP Beta released - Paw's NASCAR tracks | BeamNG
yeah, thats happend to me before, idk how to fix it though --- Post updated --- i think that resetting the cache might help