Hi Bruce,
Worked for me without issues, on all platforms (Windows, Linux, Mac).
Installation:
1) Open PyMOL
2) Plugin > Plugin Manager > Install New Plugin
3) Install from PyMOLWiki or any URL
URL: https://pymolwiki.org/index.php/Pytms
4) Click "Fetch"
Test Usage:
1) Load something:
Dear Bruce
Try the SwissSidechain PyMOL plugin and database
https://www.swisssidechain.ch/visualization/pymol.php
Annemarie
Dr. Annemarie Honegger
Dept. of Biochemistry
Zürich University
Winterthurerstrasse 190
8057 Zürich