Why doesn't City Sample open?

I created the City Sample project, and all I see is this plane:

I watched videos of others and it shows a project. Is there a something I am missing?

Also, it prompts for something called Houdine Engine Plug-in and Traffic plug-ins, which I had to choose disable or the program closes.

Why don’t I see the ‘City Sample’ is my question.

Every video I watched already had the sample open.