I unzipped the file into the ..\studio\plugins folder and started up the studio. I had hoped to be able to restart studio and see the option to create a new jBPM5 project. No luck with that. I guess for now I will just work with the Eclipse that got installed via the standard installation procedure.
I guess I just need to play with this a little more to learn more about how it all gets set up and used. The documentation is a bit weak here but hopefully will mature over time. Perhaps someone will document what they learn in this area :-)