jusmee, yes, I would like to know before purchasing the book if it will be easy to navigate. If it's too difficult to navigate, I'd rather save my money until such time as a better option becomes available to buy.
Adoby, thank you for the recommendation of looking for a forum dedicated to the publisher. I've emailed one publisher to ask them this question about a particular download, but have yet to hear back. Hopefully I'll hear sometime this week.
Thank you all for your suggestions! You've given me a better idea as to how to search online for what I'm looking for.