Hi Harmienta,
I’m sorry to hear that you are having problems with the Standard Assets. Which exact version of Unity do you use?
Instead of CrossPlatformInput, you could simply use Unity’s built-in Input.
Are there any error messages pointing to the Circuit assets? If so, what do they say? If they say “Replace X with Y”, double click on them and do what they suggest.
If the Circuit asset is causing too much trouble, remove it. Watch the video without implementing the Circuit in your project. It’s just that one lecture. In a later lecture, Rick is going to replace the waypoints with a Timeline animation, so you will not miss anything crucial.