Eu tentei várias vezes com vários pacotes diferentes e tentei atualizar o pip. Eu faço
C:\Users\Michael>pip install pillow
Collecting pillow
Downloading https://files.pythonhosted.org/packages/40/f2/a424d4d5dd6aa8c26636969decbb3da1c01286d344e71429b1d648bccb64/Pillow-6.0.0-cp37-cp37m-win_amd64.whl (2.0MB)
100% |████████████████████████████████| 2.0MB 1.8MB/s
Installing collected packages: pillow
Could not install packages due to an EnvironmentError: [WinError 5] Access is denied: 'c:\\program files\\python37\\Lib\\site-packages\\PIL'
Consider using the `--user` option or check the permissions.
You are using pip version 10.0.1, however version 19.0.3 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.