Hi Charles,
Welcome.
The FMS Data Manager should detect your X-Plane 11.50 correctly. You can check the path in the Settings Tab
You need Zibomod v3.46 or later. Please see FMS data not working for ZIBO mod 737 - #3 by NAVData
Version number (current v 1.8.5.1105) is shown in Settings also:
If running an out of out version you should be prompted on startup of FMS Data Manager:
Cheers
Ian