[Matplotlib-users] Possible bug in matplotlib version 3.4.3?

[Caitlin]

 Hi all.

I'm using Windows 10 and Python 3.9.6. I attempted to upgrade to matplotlib
3.4.3 from 3.4.2 and the following error was displayed whether or not I
used the administrator account:

WARNING: Ignoring invalid distribution -atplotlib
(c:\users\biopr\appdata\local\programs\python\python39\lib\site-packages)
Installing collected packages: matplotlib
ERROR: Could not install packages due to an OSError: [WinError 5] Access is
denied:
'c:\\users\\biopr\\appdata\\local\\programs\\python\\python39\\Lib\\site-packages\\matplotlib\\_c_internal_utils.cp39-win_amd64.pyd'
Consider using the `--user` option or check the permissions.

WARNING: Ignoring invalid distribution -atplotlib
(c:\users\biopr\appdata\local\programs\python\python39\lib\site-packages)
WARNING: Ignoring invalid distribution -atplotlib
(c:\users\biopr\appdata\local\programs\python\python39\lib\site-packages)

Thank you.
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