Download the demo now!
You'll be sending your first large file in a couple of minutes.
When you're ready to move from a demo install to a production install, there's no need to reinstall the system. When you install a license, it will turn your demo install to a production install. You can of course choose to reinstall if you want, and you're always free to move between platforms with the same license, as long as the license is only used at one install at a time.