Fixed what seemed to be a weird phrasing.
Python guru or system administrator. (E.g., :file:`/usr/local/python` is a
popular alternative location.)
-On Windows machines where you have installed from the :ref:`Microsoft Store
+On Windows machines where you have installed Python from the :ref:`Microsoft Store
<windows-store>`, the :file:`python3.9` command will be available. If you have
the :ref:`py.exe launcher <launcher>` installed, you can use the :file:`py`
command. See :ref:`setting-envvars` for other ways to launch Python.