Maybe something has gone wrong with that install on the mac.
You could remove the Lung CT Analyzer extension and restart Slicer. Check that it is gone.
Then, clone the Lung CT Analyzer Github version by
git clone https://github.com/rbumm/SlicerLungCTAnalyzer.git
into a directory of your choice.
Then go to Slicers “Application settings”
and manually add two folders here:
LungCTSegmenter
LungCTAnalyzer
Restart Slicer. This should give you the most recent version of the extension.