You should be able to run LW 4.18.8 on your machine. You will not be able to run LW 5. However, what I'd like to know is what happened. Did you previously install LW 4.18 or LW 5? Were you able to open the program after installation or did it refuse to open? If it refused to open, then I could get you LW 4.16 which works fine on both of my computers that have LW on them, one being an old G4. You can try LW 4.18.8 from here: http://www.limewire.com/download/oldversion.php
LW 4.16 you'd need to get directly from me.