I attempted a while back to download and read some of that but quit after being frustrated by the awful user experience of every epub software that I tried. I couldn't find one that supported whatever form of linking the book uses. If I wanted to go directly to a story I just had to flip until I got there.
I've always like Calibre for epub reading, but I'd have to try it with that version specifically. The other option might be to use a MOBI converter and hope it cleans things up, but that's a pain for long odds.