I am studying the Maya program with its book Mastering Autodesk Maya 2016, after having also studied Introducing Autodesk Maya 2016.
I'm sorry to say that when you get to Chapter 9 it's totally impossible to follow his instructions because the scenes that exist to download on the book's website can not be opened properly in the Maya program.
For those of us starting in 3D CG this is a serious complication because it prevents us from moving forward.
I would ask you to reload the scenes to make them visible so that we can continue our studies.
Juan Pedrosa Luna