I just uninstalled BitTorrent (Ki used to use it on this computer and I remember it destroying the last one I had) but I'm not terribly bright or well versed on computer stuff.

I'd download it for you but my ISP seems to have blocked most/all of torrents for me. KAT generally is respected and you can trust them, but if in doubt check the comments section: it will tell you if the torrent is a fake or contains any viruses or spyware. I must say, in many years of torrenting I've yet to pick up anything nasty.

This one's remastered, but is an ISO
http://kickass.to/pink-floyd-the-wal...d-t822446.html

and another one
http://kickass.to/pink-floyd-the-wal...-t3574768.html

(As expected, none will download for me, sorry).

I've seen the Earl's Court show and the Nassau Coliseum show from that 1980 tour, both on VHS and online. The picture quality was about the same and I think the only copies out there are the bootlegged ones. Supposedly, Roger Waters has the original footage and won't release it because he thinks it's not good enough for a commercial release.

Here's a link to a download for the Earl's Court show...

T.U.B.E.: Pink Floyd - 1980-08-09 - Earl's Court (2xDVDfull pro-shot)

Click on the show title and it will take you to the guitars101 forum where the links are.
It's been uploaded to several different file hosting sites. Some of the links are dead but the filefactory links are still active. I haven't downloaded the show yet, so I don't know if the picture quality will be any better than what's already on YouTube.