The main aim is to research as to how many real users exist versus the demo users. As, it has been observed, that the demo provides you with the real data which can only be used. The data supplied though real, can not be traded with or tested upon.
Have Amibroker Pro (always latest version) in my software arsenal for over 5 years. I believe you can test with Amibroker Demo version, you just can't save your work. When you shut down and restart it comes back up with the demo data, if I remember correctly.