First you have to make sure you search with keywords (the band andor/ the song) instead of exact filenames (the band - the song 03.mp3). Keywords produce more results. LimeWire has this cool feature called GROUPING when your results are listed and say 10 other hosts have the exact file (filename and size) it'll "group" that result. Meaning when you download from a GROUPING you'll have a better download succession rate b/c of the 10 different host to download from. But the reason it says COULDN'T DOWNLOAD is b/c that particular host has LOGGED OFF (exit LimeWire) or his upload slots are full and/or you or him has sufficent amount of bandwidth to establish a connection and transfer.