Steve Dower added the comment:
Unless someone can find an authoring bug under Tools/msi, I don't think we can
do anything about this. We rely on the built-in Windows support for adding and
removing these variables, and if that's broken, we can't do anything with our
current setup.
I really
New submission from Luca :
This issue is related to:
https://bugs.python.org/issue3561
and:
https://bugs.python.org/issue45968
When installing Python under Windows, if the "Add Python 3.x to PATH" option is
flagged, the following two folders are added to the PATH environment variable:
%U