The package works just after installation without any extra setup. You are required to setup all your input properly though. Siri Remote 2nd generation clickpad supported.

Input System Package (New)

You can process Siri Remote as a generic Gamepad using Input System Package (New). If you need to separate Siri Remote to its own scheme you can always process it as more specific Apple Micro Gamepad.

Input Manager (Old)

By default axes and buttons are mapped as in Unity excepting Menu which is mapped to joystick button 16. As an option you can remap physical elements to another axes and buttons.

Demo version

There is a demo version on GitHub. Please note that touchpad and clickpad work only for 10 minutes in demo version.