won't launch upgrade
 

I downloaded the upgrade to 2.7 several times and the installation tells me I have 1 unfatal error, then when I try to launch i get a fatal error message which says 'Unable to Launch Java application' and the following details:

java.lang.ClassNotFoundException: com.limegroup.gnutella.gui.Main
at com.zerog.lax.LAX.launch(Compiled Code)
at com.zerog.lax.LAX.main(Unknown Source)
at com.apple.mrj.JManager.JMStaticMethodDispatcher.ru n(JMAWTContextImpl.java)
at java.lang.Thread.run(Thread.java)

any ideas?