I would give the new Mac beta installer a shot at:

http://www.limewire.com/beta/1.6b/mac

The new installer is simplified significantly, and may work better for you. If it does not work, then there is probably some incompatability between InstallAnywhere (the installer program that we are using on the Mac) and something in your configuration.

That's really the best we can do for now. We unfortunately cannot make the installers and more straightforward (any more less reliant on having some specific configuration on your end) without moving to completely different install programs.