This site is being deprecated.
Please see the official X‑Plane Support page for help.
Once you have received the DVD set, you can either use the installer found on the disk or the newer one located on the X-Plane site. Once X-plane is installed, you can immediately update to the latest version. (You will probably need to restart the installer to see this option on the first screen.)
Did you purchase the third party aircraft through Steam as well, or directly from the creator? If you have an email purchase receipt from the aircraft artist, you may simply be able to re-download the aircraft file. Then you can unzip it and drop in in your new install's aircraft folder.
This site is no longer being actively maintained.