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Why does one need this on macOS (which has had a dedicated toggle for this in System Preferences for a few versions now)?

For the casual reader who does not know:

* Start app 'System Preferences'

* Pick 'Keyboard'

* Click button 'Modifier Keys...'

* Per keyboard you can now configure what the caps lock key does. One of the options is 'escape'. Which is what it should be :)

You don't, because this doesn't run on macOS, it only runs on Windows.

The other operating systems just are described how you can do the change without the tool, see https://github.com/susam/uncap#mac-system-preferences