How to install cls on Windows ============================== Some Python libraries may need to be compiled. In order for you to complete your Python installation you want to install the *VC C++ command line Build Tools*. This is mostly needed for cryptography libraries. You can find them at: * https://visualstudio.microsoft.com/downloads/#build-tools-for-visual-studio-2019 Once you run the installer you need to check on the choices as shown in the next image. .. figure:: images/VSprintscreen.PNG :width: 200px :align: center :height: 100px :alt: alternate text :figclass: align-center Figure: Select the command line (CLI) build tools You will also have to add the following path to the PATH variable:: C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.24.28314\bin\Hostx64\x64\ Make sure you adapt your path based on the current version of this program