Hi Geoff,
Yes make sure the X-Plane 11 path is correct in Settings of latest FMS Data Manager for MacOS.
Then in Addon Mappings pres Scan and Save . You should see the X-Plane 11 (11.50+) which has default X-Plane aircraft including Zibo, as well as other X-Plane 11 addons.
If still an issue please post screenshots showing X-Plane 11 path in Settings and paths in Addon Mappings using Posting Guide - Uploading Screenshots.
Cheers
Ian