Launch JCM5 using Java Web Start:
Webstart will cache JCM5 locally, but should automatically check for updates if you are online.
(this cache may be adjusted via your "Java Control Panel" (from windows, find inside control panel).
note: if you get an error saying that the jar files are not all signed by the same key, it may be because an old copy of JCM5 remains in this cache
Note: JCM5 requires Java 5 (=1.5), it will not work with any older versions.
You can get the JRE for free from Sun at www.java.com
An alternative way to start JCM5 is to save the following files to your disk:
From Windows or Mac, just click on JCM5.jar to run the model.
In Linux, use the command java -jar JCM5.jar (from the directory containing these files)
Note that a jar file is a type of zip archive, but it should *not* be unzipped to run JCM.