Hi Richard,
If you are asking how to upgrade JRE on your machine or install newer version in different location, this is really Operating System specific. Let me know what OS/distribution you are using so I can try providing some help.
Crucible stopped supporting Java 6 mostly because it reached its end of life in February 2013, see http://www.oracle.com/technetwork/java/eol-135779.html. You can still trying to run evaluation on older Crucible version which still supported Java 6. Or give it a try with the most recent one - although Java 6 is no longer supported there is still good chance it would run correctly. Bear in mind this is not supported configuration though. Personally I would strongly encourage to upgrade Java ASAP, having no security patches for it since February 2013 means you run a risk of having your system compromised.
Kind regards,
Piotr
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