The app is designed specially for playing audio books.

You have to manually download the books and place them in subfolders under the "My Audiobooks" folder on your phone.
Every book must be in a separate subfolder even if it consists of only one file.
In Library→Settings→Root folder select the "My Audiobooks" folder.
Once finished don't forget to press the "Update" button at the top of the Library window.

First 30 days Full version. Later - Basic version.
Features:
+ Playback speed control. I