double click on song after it was downloaded and nothing happens.

Hi

I assume that you are interested in getting music out of your machine. If you want to use the MP3 player built into Limewire (which is the Limewire default player for some reason), go to Library and you will see the Player in the bottom section of the template window. Highlight the offending file and transfer it to the Playlist — music is then obtainable. But there are better players around (iMusic if you are on a Mac — you're own your own if you must insist on having a PC) so in Preferences, cancel the default and so select whatever internal Player is available, then highlight the Library file and launch. That does sometimes fail so be prepared to add the file to your internal player manually and enjoy the fruits of your downloading labour.