Allan,
Mac switched to python 3.7.6
Same issue I’m afraid even after pip
pip install anvil-uplink
Requirement already satisfied: anvil-uplink in ./my_env/lib/python3.7/site-packages (0.3.32)
Requirement already satisfied: ws4py in ./my_env/lib/python3.7/site-packages (from anvil-uplink) (0.5.1)
Requirement already satisfied: six in ./my_env/lib/python3.7/site-packages (from anvil-uplink) (1.15.0)
Requirement already satisfied: future in ./my_env/lib/python3.7/site-packages (from anvil-uplink) (0.18.2)
Requirement already satisfied: argparse in ./my_env/lib/python3.7/site-packages (from anvil-uplink) (1.4.0)
(my_env) (base) Mike@iMac wells_row % python --version
Python 3.7.6