This tutorial has been created by Malene Thygesen of Gebler Tooth Architects
See Mal's written instructions below:
pyRevit is developed by its sole creator Ehsan Iran-Nejad: https://github.com/eirannejad
It is an open source software and distributed with GNU General Public License v3.0.
That means pyRevit is free to use for private or commercial purposes; it can be modified to suit your needs, distributed.
Ehsan has a pyRevit blog and YouTube channel providing extensive information on how to install, set up and use pyRevit. Including support and information about all the functions in pyRevit:
YouTube channel: https://www.youtube.com/pyrevit
And important to mention is that there is a patreon: https://www.patreon.com/pyrevit
So, if you use it personally and/or professionally it is always a good idea to contribute to creators in general - who provides open source software.