Offline installer download - pymanager does not respect user/pass with authenticating proxy

[pandel]

Hi!

I am using Windows OS...

If I try to download a Python version via an authenticating proxy (don't have any other chance), pymanager fails, because it does not take user/password into account, even though it seems to find the system proxy which is setup under Windows:

Failed to download using BITS. Retrying with fallback method.
# ERROR:
Traceback (most recent call last):
  File "manage\urlutils.py", line 450, in urlretrieve
  File "manage\urlutils.py", line 137, in _bits_urlretrieve
OSError: [WinError -2145844841] Download error: HTTP-Status 407: Proxy authentication required.

How to fix this? I am unable to setup any additional environment variables, as this is not allowed for the standard user, so pymanager has to figure this out on its own.

Regards,
Holger