You can easliy revert back to LW 4. Use the forum search to look for revert, or old installers.

What fixes have you tried? Which OS are you using? Which version of LW 5? Which version of Java? Do you have only 1 Java version installed on your computer?
Have you tried the fixes here: http://www.gnutellaforums.com/331559-post2.html

LW & BS are both programs that you use to connect to the Gnutella network. They're not downloading sites - the network lets you connect to other people who are sharing files. If you want to know which BS version people recommend, look through the BS section of the forum.