It turns out that, if you have the old 4 chapter version, you can’t get the new 40 chapter, 60,000 word version, even if you return and buy it again, like I did 3 times. You have to remover the old version before the new one will load.
To remover the old 4 chapter version, first make sure your device is set to sync and accept updates in settings. Then go to home or library and find the book. PRESS and HOLD the cover you want to remover. It took me 4 times before I got a 5 option menu, including Remover from Device. Press it. The new version loaded immediately for me then.
Good luck, and I hope you can finally enjoy the book.