This site is being deprecated.
Please see the official X‑Plane Support page for help.
Please contact customer support at firstname.lastname@example.org. They can evaluate this on a case by case basis.
If you already have X-Plane installed on a computer you might be able to work around this by copying the existing installation to a back up of some kind (external hard drive, etc) and then moving it to the new computer. There is a USB key you can purchase that is cheaper that will keep you out of demo mode.
This site is no longer being actively maintained.