If you are on Ubuntu, installing PyMOL is as easy as sudo apt-get install pymol. Unfortunately, almost all students in my medicinal biochemistry course use Windows as their OS (why?!). This page contains a “followable” set of instructions to install PyMOL on Windows. Note that you could use the PyMOL installation from Schrodinger, but you need a paid licence for that (yuck!).

So, first we need a couple of things. A Python interpreter installation and a few libraries at least.

1. Download Python 3.7.2 from the Python website (the file you want is Windows x86-64 executable installer).
2. Run the downloaded file and select the customized installation. Leave everything as is, with the exception of the install location. Set this to C:\Python37