Check MAJOR TOPICS for Upload/Download HELP (click on blue link) top few links. They discuss how to find more hosts. Sometimes cancelling download & re-selecting from search results refreshes the download. Also use the Get More Results option from search tab periodically.

BTW there is a small chance that one of the hosts selected the file to download from the original hoster of the file. However the original hoster is not online & the others have less than 1% of the original file. Partial file sharing allows people to share as much as they have downloaded.