The ebook is currently available in ePub and PDF formats, available via the following link (I can't upload it directly here since 16mb is larger than the forum's permitted max size):
There is also a KML file included that can optionally be used with GPS devices (or viewed on your computer). In addition to showing the route, the KML file includes pins showing all the locations mentioned in the guide (plus many others, such as albergues). These pins are 'interactive' - they can be opened to show details about the location. The guide is fully self-contained, so you don't need to use the KML file, but I'm including it for those that might find it handy.
The core content of the guide can also be read on my website (www.trekopedia.com). The website pages will always be the most up-to-date, so if you are looking for the latest details on the hours an attraction is open, the website is recommended.
For offline use, or casual reading, the ebooks are probably better since they are written as a 'book' rather than organized across hundreds of website pages. The ePub format is best for reading on a mobile device (such as your phone or a tablet). The PDF format is better if you plan on printing a hard-copy of the guide.
A version in my 'TrekRight' app is coming soon (the app will be free).