It's a zip file with a torrent file inside, you need a bitorrent client to download the whole manual use
µTorrent - The Lightweight and Efficient BitTorrent Client
Install utorrent, download the posted file , unzip (to unzip you'll need winrar or winzip ) and open the torrent file inside , your download will start at once.
Please seed leave it open so other can download as well.
Seed=people sharing the file.
leech=currently downloading
That is the torrent language.
This seem complicated but it's not it's really easy, and using torrent, will help you get much more than just the manual, i suggest you look into this, it very good.