jBPM5.2.0.Final depends on Drools 5.3.1.Final.
Hope this helps.
Thanks for the answer.
Version 5.3.1.Final isn't available on the drools site (http://www.jboss.org/drools/downloads). I was able to download it from the maven repository but that was downloading individual jars. Is there a standard location for the 5.3.1.Final package which will also have the licensing information and the source jars?