I have the Fsx FlightSimulator. I'm trying to re-install EZDOC a camera add on. That's where the problem is . I go to the Flight 1 Web Store, where I once purchased it, with the key and password. When I click on VALIDATE , I get an error message that says : FLIGHT 1 E- COMMERCE- RUN TIME ERROR 53. I've done the registry thing, I have windows 8, the Sim was done in Windows 7 along with the EZDOC Download. The UAC Slider is all the way down. Thanks for any idea you might have.