If you have any questions about the downloads and how they are used for reference in the book, this is the place to post them. The downloads are meant to provide readers with examples that are already set up and, in many cases, can already use on practical problems. If you have questions about how they apply, feel free to bring it up.
This would also be a good place to make suggestions for more downloads that might help readers understand various concepts from the book. If you have an idea for a helpful example that would be of use to other readers, let me know and I will post it.