This site is being deprecated.
Please see the official X‑Plane Support page for help.
Uploading a copy of the log.txt from the main X-Plane folder after seeing one of these crashes to a file site such as Google Drive or Dropbox will be the most helpful.
You can also try clearing the Plane Maker preference files in Output > Preferences of the X-Plane root folder. I was able to start each program on Steam.
This site is no longer being actively maintained.