> In my case, first I tried using the latest Python 3.13.9 both from Windows 7 (bad idea due to resource fork loss) and macOS 10.14.6 Mojave, but neither worked: it seems like that version of Python was just too new. I then retried with Python 3.8.10 instead (which I chose thinking it might be more period-appropriate for the script's age) on Mojave, which worked flawlessly.

Ah, classic Python. Removing features [0] and breaking perfectly working software just because the feature is old, ugly, and not widely used.

[0] https://github.com/elliotnunn/tbxi/issues/1