What type of file(s) are you downloading? If torrent files, then patience is best. Giving lots of upload bandwidth helps.

If Gnutella network files, then re-search the topic of the files again, then some time later right-click the search tab & choose Find More Results. This will hopefully find more hosts to download from. Unfortunately in LW 5 you cannot delete the download file & re-select it from search results to help give it a fresh start because doing so deletes the incomplete file.