For some time now, I have been unable to download files using this machine (which has the latest updates of Firefox), although the old Win98 box with an ancient version of Firefox does exactly what it should. This morning I tried to get the C-82 FDE upgrade on this machine and lo and behold it worked !!
It has always looked like a Firefox problem, but I am quite sure I tried a download after the most recent update and it still didn't work; so I don't know who fixed what but I appreciate the effort.

MikeW