I had the same problem.
After installing Python for all the users, wanted to install Django.
For that I've gone to the Command Prompt (without using Admin mode) and
pip.exe install django==2.2
This prompted the following message
Could not install packages due to an EnvironmentError: [WinError 5]
  Access is denied: 'c:\program
  files\python37\lib\site-packages\pip-19.0.3.dist-info\entry_points.txt'
  Consider using the --user option or check the permissions.
The way I've used to solve it was to add --user in the end of the command, just like the prompt message suggests («Consider using the --user»).
pip.exe install django==2.2 --user
Then everything worked fine.