Can someone give me tips on how to get partial downloads restarted.

In an earlier topic some weeks ago I was told that Gnucleus had a retry facility but I'm not sure how to make it work.

I had a download that was 92% completed very frustrating), when I connected next time it showed in my partials window but didn't seem to restart so I clicked on download and it then failed and disappeared from the partials window although it was still on my hard drive.

Any help much appreciated