If I have both versions of FSX on my system, in which version of FSX will the non-Steam add-ons be automatically installed?
Posted by on 08 July 2015 11:51 AM

Most add-ons are supplied include installers that are outside of our control and so we cannot definitively predict what their behaviour will be.  We expect that most would default to installing into the non Steam version of FSX.  With some add-on installers, you may be able to direct the add-on installer to deploy into FSX: Steam Edition, but we cannot guarantee the add-on will function correctly in this environment. If your Microsoft Flight Simulator X: Steam Edition is on a separate machine that does not have boxed FSX on it, we believe that most boxed add-ons should function correctly with the FSX: Steam Edition.