This site is being deprecated.
Please see the official X‑Plane Support page for help.
Laminar Research (creators of X-Plane) does not sell any additional aircraft, such as the Beechcraft Duke. It looks like there is a version sold on X-Plane.org (not affiliated with Laminar Research or this site). Please contact them directly if this is what you want to purchase.
This site is no longer being actively maintained.