I am not sure what the issue might be. I just downloaded the file and was able to open it. It is a PDF file and so you would need a pdf viewer to see it. Something like adobe reader. I recommend Foxit viewer though.
The manual is for the 76-78 A, so it should be pretty accurate. It is also the honda shop manual, not a clymer or hynes.
What operating system are you using? I did the test on windows xp with foxit and mac osX 10.5 using Preview.
Click on the 76-78 Auto link and choose to download it. Takes about a minute. If you still get an error, post it and I will see if I can figure out what the issue is.
The ride IS the adventure. The destination is just to get gas!