In FMS Data Manager Settings for X-Plane Path use the black folder to navigate to where you have X-Plane.exe. Write down this folder location for later.
Press Save.
In Addon Mappings press Scan and you should have entry X-Plane 11 (11.50+). Press Save.
In Addon List select entry X-Plane 11 (11.50+) and press Update .
If no joy, using Manual install make sure you unzip xplane11_native_2110.zip to …your X-Plane 11\Custom Data
Still not detecting add-ons when I press Scan.
Did you mean for the Manual Option to save into X-plane 11/Custom Data/Custom Data as above or just X-plane 11/Custom Data? I’ve tried both anyway.
Apologies, should be X-plane 11\Custom Data. You need to open the downloaded xplane11_native_2110.zip and copy (extract) the contents to your X-plane 11\Custom Data.
It should look something like: