Due to the steam installation process, it appears that sometimes you Flight Simulator registry entries get corrupted, thus leading to Scenery Profile being uncapable of detecting your Simulator.
This new version, available on google drive at this adress:
will correct this.
You will also have a new command available through the Tool -> Set your simulator path where you will be able to manually set the path to your simulators.
If some of you still have problem, please let me know as I can fix it quickly.
Kind regards and Happy flying !!!