Buy and support the original developers of the software ie Laminar Research.
Steam is a 3rd party company taking a commercial advantage of X-plane and having done none of the research and or development in creating X-plane.. There is no commercial relationship between either company. Laminar Research does not support Steam
You will get more support from Laminar Research. This forum is the dedicated LR site whereas Steam users do try to raise their problems
I am not associated with either company.