The org.lcsim software requires Java JDK 5.0 (also know as Java 1.5 to confuse you). You can download it from:

http://java.sun.com/j2se/1.5.0/download.jsp

You can download and install JAS3 from:

http://jas.freehep.org/jas3/

After installing JAS3 run the application and from the menu bar choose:

View, Plugin Manager

Now choose the Available Tab, and select all of the following:

• HepRep Plugin
• WIRED 4
• WIRED 4 Base Library
• org.lcsim

then click install, and then close the plugin manager.