I am not able to run the 5.5.0 Guvnor version with my jBPM 5.4.0.Final configuration with the JBoss AS 5 (I have a production environment with the JBoss EAP 5.1 that cannot be upgraded).
I downgraded the drools-guvnor to the 5.2.0.M1 version, and successfully installed with the ant script (install.demo).