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Cannot start java applet
You may lack java 2 support. Visit java.sun.com and download J2SE.
You may also need Internet Explorer 5 or Netscape 5 or higher.
...is what this error said in 2004. More likely you have disabled Java in your browser for security reasons.
The downloaded version should work as long as you have Java installed and are running Windows.
(it may work in Mac or Linux, who knows?)