On the author's website,
http://www.mayerbrenner.com/ the books are offered in word .doc format, so you can easily convert to any format needed. I've never heard of the author or the books, but I support the idea and have downloaded the books and will start reading soon.
Sounds like another author that has offered something "free," which will probably convert me into a buying customer. I have discovered so many new authors this way. Great concept and I love supporting it and the authors that promote it.