Hello Peter,
I hope this message finds you well. I have a solution for the issue you are currently facing.
To start, for XPlane 12, please select the location of your XPlane12.app file by following the instructions provided in this link FMS Data Manager Mac book - #9 by vishalahir. Once you have set the correct path in the FMS Datamanager, you can scan the addons and install them.
Next, if you want to connect your running flight in XPlane 12 with Flight Plan loaded into Navigraph Charts, you will need to install the Simlink application by using this link https://download.navigraph.com/software/simlink/osx/Navigraph+Simlink.dmg and then install the Simlink Plugins into X-Plane 12 by following the instructions provided in this link FAQ - Simlink Install and Systray.
Once you have correctly configured the Simlink Plugins, you can use the Moving Map functionality with the Navigraph Charts.
If you encounter any issues with Navigraph Products, please do not hesitate to inform us.
Best regards,
Vishal Ahir
Navigraph