Just installed, opened AngryBots, and there's nothing in the hierarchy

As the title says. Running on Windows 8 the latest version of Unity and I open the project names 4-0_AngryBots and there’s nothing in the hierarchy except for “Main Camera”, and so the Scene and Game screens are blank.

I can build and run and the game works fine opening in my browser, or as a windows app, depending on what I choose of course.

So what am I missing in order to start playing around and editing this?

open scene

Double click the AngryBots scene file…

It’s right there at the top of the assets explorer when you open the project.