hmm ... not sure. It might not be absolutely identical in download hash as the other, despite title & file size. Try one you know has a low download percentage, once you find it in search results, cancel it & select one from search results. Although even if you did select a larger one you could resume from incomplete folder, just prefer to experiment with the smaller ones just in case something more severe has happened in the corruption of your download preferences.

Awaiting sources means you have attempted resuming the file. Sometimes just leaving it to its own efforts to find sources whilst doing searches for sources sometimes does the trick. But, either way.

Which version of LW are you using? Which operating system version?