@rhyolight, there was a network connection problem at some point. I don’t know where it came from, but apparently other users noticed I too.
I waited a while for the connection to come back on, but apparently I had to refresh my browser for that to happen. I missed about ten minutes due to that. So this is a tip for next time.
Also, I googled how to use Python in Unity. There are some third party tools that seem to allow it. But there is also this free 3D editor/ game dev environment called Blender that uses Python natively I think.
Blender also has a large extremely enthusiastic user-base. Maybe some of those people would be interested in looking into HTM through Blender. (Just a thought. I don’t know nor use Blender).