I'd like to very much thank whoever it was in another thread (I have only just joined this forum) for suggesting LeechGet. Google for it.
It turns out that the enhanced version of IconPackager, that we paid for, is one of those applications that won't download properly unless a download manager is used. I am on dial-up - I can't speak for those of you who have broadband.
I have wasted hours trying to get a properly working IconPackager, and the support people have tried to help me, but they said gaily that it was probably a corrupted download, use Stardock Central - which didn't work at all. They also made other suggestions which didn't help. So now I can advise them.
Get LeechGet, which only works through IE, not through Firefox, and download the enhanced IP with it. Problem solved! A working IP and downloaded icon themes that will actually install and be applied.
Now, all I have to do is find some attractive icon themes instead of the ugly ones I have seen so far. Anyone remember the beautiful White Glass Folders and Gold Leaf 2 from years ago? Icons that actually look like real Windows icons, but with more style.