The link you provide is to your home PC hard drive. A very bad idea.
Apparent free download at:
http://zypokava.jimdo.com/2013/12/04/politically-incorrect-guide-to-islam-by-robert-spencer-pdf/
It seems to want one to download because the link your provided downloads the book. Google does a direct link to the file. I say it is the file, but I can after it downloads open it on the browser which is what I attempted to do and the link was to my computer where it stored the file.