This site is being deprecated.
Please see the official X‑Plane Support page for help.
Support for the Steam version of X-Plane is handled by Aerosoft. Contact them at aerosoft.de for additional assistance.
I did find this FAQ from Aerosoft which might address the plane not showing up issue. Item #4 explains how to install freeware & items not purchased through Steam. (You didn't say if you purchased the Carenado plane through Steam.)
X-Plane 10.42 should be the current final version on Steam. We are in beta testing on 10.45b2, but it is not available to Steam users yet.
If you are interested in purchasing a different version of X-Plane, please contact email@example.com as we address these issues on a case by case basis.
This site is no longer being actively maintained.