Several users have raised an issue with the Steam version of X-Plane on the Mac. Because the default Steam install location is inside your ‘Library’ folder, and this folder is invisible, you cannot select anything below it in the OpenSceneryX installer.
To solve this, the next version of the installer will have a ‘Use Steam’ button on the Mac – this will automatically check whether the X-Plane Steam folder exists and if so, sets it to be used by the installer.
This work is done, but there is another feature being worked on at the moment (watch for the next blog post!), so a beta version will be released at some point once both new features are ready for testing.