Applies to Launchpad Pro
To set the Launchpad Pro up with Ableton Live 11 please connect your Launchpad and then open Ableton.
Then go to the Preferences (Options > Preferences on Windows, Ableton Live > Preferences on macOS) and go to the Link/Tempo/MIDI tab:
Then select the Launchpad Pro Control Surface:
And then set the Launchpad Pro (Live Port) and DAW (Launchpad Pro on Windows) for the Input and Output ports:
Then match the settings below: