You are in the bearshare forum .... Never mind.
You try to download a file, and after a while it changes to Need more sources. This means that the source(s) for that file have gone off line or otherwise are not available ..... USUALLY ....
Sometimes for reasons I cannot fathom it only requies a click on resume to restart it.
Usually if you click Find More Sources, a countdown will start and Limewire will search for the file on the network. It may find it and will start downloading. It may not, in which case it will change to Awaiting sources and may stay that way for weeks
I find however if you start a new search for that file, and it does turn up in the search it often triggers the download into resuming.
Of course you could also turn up a new version of the file which you can always download instead.
Awaiting sources appears after Find sources has failed. This is why 'Find Sources' works a lot better than 'Resume'