Based on what I see on their official website, the software requires OSX 10.1.2 or higher and Java 1.4 while the latest version of Java is 8. Also Apple disable the usage of Java technology for versions prior to the latest one.
Download the newer one from the following website: https://java.com/en/download/
Once it's installed, launch the software again to use it. Also the support for this software doesn't exists since it was terminated in 2004.