flask install
# install flask (basic, if path is not set yet) py -m pip install flask # or set PATH to use pip: setx PATH "%PATH%;C:<pathtopythondirectory>Scripts" pip install flask # if "connection error: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed" [!]: py -m pip install --trusted-host pypi.python.org pip flask # if PermissionError: [WinError 5] Access is denied py -m pip install --user flask # or via creating a virtual environment venv: py -m venv c:pathtonewenvironment # then execute: c:pathtonewenvironmentScriptsactivate.bat