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 !