Transferring E-books to Pro+:
Two options:
1. I use the great free program: calibre to manage and transmit books using an USB. calibre recognises the eRaeder Pro+.
http://calibre-ebook.com/
2. Connect your ereader to your computer using the USB cable.
Once the divece is recognised you can manually drop books in the folder:
> Computer\eReader_Pro\NAND FLASH\Books