Hi Feriel Flower,
The current release for JBPM is JBPM5.4
If you want to use jbpm5.3, you can follow this guide on how to install and start the demo:
http://docs.jboss.org/jbpm/v5.3/userguide/ch.installer.html
If you want to use jbpm5.4, you can follow this guide on how to install and start the demo:
http://docs.jboss.org/jbpm/v5.4/userguide/ch.installer.html (last time I check, this guide still refers to the jbpm5.3, too bad..)
If you are just starting to try jbpm, I suggest you use the JBOSS AS 7 provided by the full installer instead of using your own jboss server to make things simpler. Once you feel ok with the demo, you can start customizing settings.
Regards,
Thomas Setiabudi