Hi John,
Welcome and thank you for checking.
Please
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Download, install and run FMS Data Manager
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When prompted to Scan for addons on start, say no.
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In Settings page, check your X-Plane 12 path (where x-plane.exe is located) has been correctly detected. If not navigate to your X-Plane folder (where x-plane.exe is located), and press Save.
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In Addon Mappings page, press Scan. Your X-Plane 12 and any X-Plane 12 addons should be detected. Press Save
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In Addon List, select X-Plane 12 and any X-Plane 12 addons, and press Update
Cheers
Ian