Send Map to GPSMap62stc | MapInstall Not Working

For some reason, MapInstall isn't behaving properly.  Reinstalled it (version 4.3.6 on Mac M1 running Monterey latest), same behaviour.

Basecamp had an option of sending maps after sending a route that I was working on.  MapInstall froze.  That's when I reinstalled it.  Same thing happening now.  I double click to open it, it's in the dock, but no menu, no app focus.  

I'm dragging an OSM.img to path GARMIN/Garmin and am hoping for the best.  

Why is this app not working?  

Cheers