RelayDock

RelayDock lets your Ableton Push 3 work as a Cubase controller. This installs:

• RelayDock in Applications. It runs in the menu bar and drives the Push.
• The Cubase script Ableton Push 3 Bridge, in your Documents folder (Steinberg › Cubase › MIDI Remote).

Older versions of both are replaced.

Quit Ableton Live before installing: while Live runs, it keeps the Push to itself. If macOS asks whether Installer may access your Documents folder, allow it, so the Cubase script can be installed.