I had trouble loading it too. At first, it would only load about 4 Megabytes, and then stall, and say that there was a Network error. I think what was happening, was that the file was so big (32++ Megabytes) that it was overwhelming my copy of Adobe Acrobat.
BUT, I just kept trying to reload; and I noticed that each successive reload captured an increasingly larger portion of the total document (4 Megs, then 4.6 Megs, then 5.1 Megs, then 5.6 Megs, etc.) I discovered that each reload got me closer to the complete Manual, and after about 60 reloads (which only took 3 or 4 seconds each), that I had the complete Manual, which then worked perfectly !
This might work for you too. I'd suggest giving it a try. It won't take long to find out if it might work ...
Good Luck !