Good news. There is a quick and simple fix for Novation Nocturn script from Guille, so it can work in Ableton Live 9.6.
On newer Live 9.6 `Nocturn` is not visible in drop-down from Preferences dialog, because author provided *.pyc files (pre-compiled) for earlier Python version.
To fix it just replace pre-compiled (.pyc) with source code (.py files) so Ableton may re-compile them for new version of Python. Explained in details in the video below: