The main reason there is no Adobe download for these books is because they would then use the Adobe renderer and the user experience of these types of books in the Adobe renderer would not be overly pleasant.
The book page, from where you can read and overview, and purchase the book, should, to the right of the overview / synopsis display a little matrix of what devices the book can be read on. I believe it has been made more prominent than it previously was.
It's pretty safe to assume that any book on the "Illustrated eBooks" list is going to be in a format that can only currently be read on iOS / VOX.
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