MARIO ANTONIO GONZALEZ upgrading to leopard is not enough. java 1.6 requires a 64-bit capable mac. there are some alternatives out there but they're not easy to install or maintain. soylatte is one that immediately comes to mind.
unless, of course, you're saying that people who own macs with 32-bit processors (core solos and core duos) should "update their system requirements" and figure out how to upgrade their processors just to run limewire 5.
but i'm sure that't not what you're suggesting, because that would be just plain silly.
(Version 5.2.1)