I read a previous post about installing the Naim app on a Mac M1 but I found an easier way described on the pcmag web site. This method works for the new Mac Apple Silicon machines running M1/M2 processors and I guess it should work for the newly announced M3. It does not work for the old machines running Intel processors.
You open the App Store on your Mac, click on your name in the bottom left, select iPhone & iPad Apps under Account, look for the Focal & Naim app in the list of apps you have previously downloaded on your iPhone or iPad and click on the download icon. The app is installed in the Applications folder on the Mac. I am running the app on a MacBook Air M2.