Folks who buy books individually now have two ways they can read our books: using the ePub file format (viewable on Mac with iBooks or many other ePub readers), or via our website’s online book reader (example book here). We think the book reading experience between ePub and our online book reader is pretty nice and solves most of the use cases.
I encourage you to give our new online book reader a try with your book. I’ve been using it myself to read a bunch of the books and it’s now my preferred way to read our books - you might like it!