Don't know if this will work for you, but I tried it and it worked. I downloaded the most current version, and prayed for an uninstaller. I am not sure if it was there before or if it came with 3.8.6, but give this a try.....

Download 3.8.6
Using the finder - look for LimeWire.
On my computer, an uninstall folder came up with all the other normal LimeWire folders.
Click it, follow the directions, and close the finder.
To make sure it is gone, do the finder again.
If it is still there, put it all in the trash - then empty.

Good Luck!!!!