Newbie needs help.

Installer downloaded fine to my desktop on my Mac, but
double clicking it, it threw up this error message:

The file "limewiresoftOSX" does not appear to be compressed or encoded.
It is advsed that you obtain more information about the contents of this file from the sender or provider of the file.

Anyone know what I need to do next to successfully
install Limewire Basic. Gotta get onboard the citrus.

Help with a reply here pleassseee.

I'm on a Mac g4, with OS 10.1.5 and 512 ram.

Kia 43