dude...the install file for limewire for osx won't run automatically upon downloading...you must save it to disk first....then you will need to get your hands dirty and open terminal to run the installer fromt he command line...

...here are the basic steps to get limewire running in os x from the terminal window (command line)

1. d/l the file
2. open terminal window, and go to path of where file was d/l'ed
3. type "sh LimeWire.sh" (remember...unix is case sensitive)
4. message appears saying "Preparing to install..." (this will take a few minutes ...be patient and let it run...
5. window will appear...choose install folder/path
6. once completed...navigate from command line to LimeWire directory....
7. once in LimeWire directory...type "./LimeWire"
8. again, wait a few minutes...and the nice graphical interface of LimeWire will appear...the application is simply "java" as far as the finder is concerned...

good luck