There is a demo EduERP at The site is reset regularly so little value except to casual visitors.

A fully functional EduERP appliance (390M) is however available for download (rename to EduERP.ova if downloaded as EduERP.ova.txt)

Import this into your VirtualBox or Vmware virtualization product for a more useful demonstration. You can decide to convert to a production installation after your tests.   You will need to follow the setup guidelines at from #2 when you are up and running.