Re. my post 2 above this, I now seem to have solved my problem of video files getting stuck and even going backwards (despite a week of leaving my computer on overnight at reasonable 25kbps download speeds) by uninstalling Limewire version 4.16 and re-installing 4.14 from the link someone provided in the list above. FYI it was only video files I was having trouble with, audio files seemed fine. The two video files that were stuck at 42 and 52% respectively are now both up in the 60% range! I will report back in a few days and see if they have finished downloading.

B.