I have a Gleim BATD Simulator built on X-Plane 11. Downloaded FMS and it found it, so I selected “Always Backup Before Update” (which it didn’t backup my original X-Plane 11 data - thought it would!).
I did the update and it looked fine, however I’ve lost all US data - All I have is other countries now in X-Plane.
By the way - I also made sure that the “Americas” download region was selected before I updated. I have no clue what happened and why it isn’t giving me Americas NavData.