Sorry to hear about your foot
Well, sounds like time for a clean install. btw--"Install LimeWire.pkg" is probably what is stopping installing an older version.
Panther's Find won't look in the Library unless told, so you'll have to set up the find like in the screenshot.
Delete all the old limewire stuff (including the incomplete folder) and try 4.0.5 again--that should fix your problem. You will have to reset all your preferences, but this is probably a good thing.