I'm able to download that from the warehouse. Looking at the model, you are presenting the "backs" of a lot of the faces. Most of the time it doesn't matter, but it does for things like scoreboards, ads, and such. It also affects crowds, but only if you're going to do 3D crowds.
It's pretty easy in SketchUp to see what face is presented. Just go to the View menu, choose Face Style and then Monochrome. White is the "front" of the face, and gray is the "back". Here's how Stade Canac looks:
So you can see the scoreboards are reversed - all you should have to do is reverse those faces and you should be good to go.