Running pvpython fails: no module named paraview

I have the following problem:
Under ParaView 5.11.2 (this installer: ParaView-5.11.2-Windows-Python3.9-msvc2017-AMD64.msi),
pvpython fails with
“ModuleNotFoundError: No module named ‘paraview’”
on the line
from paraview.simple import *
Is there something else I need to set up?
Reading the documentation, I should not need any additional env variables when using pvpython
With similar problems in this forum the recommendation was to use the binary install, but that is what I did.

Indeed, it should Just Work™. Does the .zip package work?

If not, I wonder if there’s something else interfering. Does pvpython -dddd have any useful info about the paraview module search?

pvPython -dddd or --dddd only returns this.
unknown option --dddd
usage: C:/Program Files/ParaView 5.11.2/bin\vtkpython [option] … [-c cmd | -m mod | file | -] [arg] …
Try `python -h’ for more information.
I will try out the zip package as well.

Hrm. How about setting PYTHONDEBUG=4 in the environment first?

Do you have a .local folder ?

@nicolas.vuaille @Francois_Mazen