I have been going through many posts on JBPM migration from 3 to 5, and almost all of the posts seems to point towards the migration tool(Not sure if this tool is still ready for use). I am currently involved in a similar project. It is a Java based Web application which used jbpm 3.1.jar. Now from migration point of view, do we have to run the jbpm-5.0.0-installer-full? Or is it enough if we replace the old jars with the newer version? I am totally new to the bpmn version of jbpm. So any pointers would be of huge help.