On Mac:
1) Start LimeWire
2) Start Console and press the Clear Button*
3) Start Activity Monitor
3.1) select LimeWire from the list
3.2) select "Send Signal to Process" from the View Menu
3.3) select "Quit (SIGQUIT)" from the Menu and press the Send Button
4) Go back to the Console and select "Save a Copy As..."* from the File Menu.

*alternatively press the Mark Button, select the output between the marked position and the end, select "Save Selection As..." from the File Menu.