I'm quadriplegic and it's much much easier for me to use the e-books. Now that I have found a place that just sells the e-books I have a question. It says the e-book doesn't come with the material on the CD. What is the material on the CD and will it be pointless to buy the e-book if I don't have that material?

I see the exercise files can be downloaded but is there other material I need that I can't download? Like a database?