Unfortunately it takes a while to create a demo version since I need to lock down and remove a lot of features to prevent abuse.
The current demo version should still be applicable, the only difference is that the design will be responsive and mobile friendly.
demo: http://ecommerce-solution-pack.com/
You can literally get a local version of Powerstore up and running in minutes after purchase provided you have a php and mySQL server already running and ready for it.