Hi Virendra,
here is the download link for jBPM-4.4: https://repository.jboss.org/nexus/content/repositories/snapshots/org/jbpm/jbpm4/jbpm-distro/4.4-SNAPSHOT/jbpm-distro-4.4-20100618.012828-1.jar
Please make attention that this is a SNAPSHOT for preview, not the final release version. Because jBPM-4.4 didn't release officially. Hope Alejandro could release final version in the near future.