If you seek support for your issue at the Orbx support forums we can resolve that for you, you will need to provide proof of purchase though

I resolved it myself, thankyou.
That it happened at all was a clear indicator of poor quality control, particularly in pre-release testing. I don't have time to waste fixing problems created by developers who assume that every buyer has only a default FSX setup, or that they use only that developer's addons, and so only write installers to cover that.
Thanks, but no thanks.