Try to find more sources. Manual searches are the best way. Use the same search terms you used originally. If no extra sources, then right-click the search tab & choose Get More Results. Another thing I often do is cancel the download & reselect it from the search results. This has worked for me since I started using LW over 5 years ago.

Many videos are shared by Shareaza users (RAZA), & they are often very unreliable to download from.