I have the same problem, I have download MRJ 2.2.5 and MRJ 2.2.6 and when i dowload basic version the same problem come back !

Unable to locate the application's 'main' class. The class 'com.limegroup.gnutella.gui.Main' must be public and have a 'public static void main(String[])' method. (LAX)

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)

Please Help me

pilouchka