Hi,
The workaround mentioned here is working for me:
https://discuss.saleae.com/t/third-party-libraries-with-hlas/595
What I did is install a fresh Python 3.8.1 in C:\mypython38, and pip installed the packages I needed.
I then add this at the top of HighLevelAnalyzer.py
import sys
sys.path.append('C:/mypython38/Lib/site-packages/')