I have the same error: I had the previous version of limewire quit working for me with the same error, so I downloaded the new version, (2.7.3) and still cannot install Limewire on OS X. I have it installed on OS 9, and it works. I'm running OS X 10.1.5, with 9.2.2, and classic. If anyone has an answer as to why the Installer is not working, please respond. I've been a limewire user for quite awhile, and I enjoy it, and commend the limewire team for a great app. I just hope someone can figure this out. Oh; I'm running Java 2.5.5.