Thinking this tool would be the answer to life, etc., I tried it. Have now tried it on three Windows and two borrowed Linux machines, all with the same 0 results, which means it must be something I'm doing wrong. Unfortunately, the Linux machines in question don't have sufficient space to hold the downloads anyway, but this was merely an exercise to see if Windows is the problem. It isn't. I know this because I got the same two errors no matter which platform on which Jigdo was tried.
When I run the script that controls things, it gets right up to the wget part, then fails with either of two errors over and over: 1. result too large 2. 404 I have been at this literally all night, trying mirrors in seven states--New York, New Jersey, Massachusetts, Florida, Pennsylvania, Wisconsin, California--some close, some further away, and have gotten absolutely nothing but the errors listed above. If I could capture the wget output, I would be happy to send it along, but the above brief error descriptions really say it all. Suggestions?