Updated INSTALLATION docs.

docs/INSTALLATION.md

@@ -1,5 +1,9 @@
 # Installing Python
 
-If Python isn't already available on your system follow the instructions at [the Hitchhiker's Guide to Python](http://docs.python-guide.org/en/latest/starting/installation/) to install Python on your computer.
+If Python isn't already available on your system,  detailed instructions by platform can be found in the [Python Setup and Usage][using python] section of the official documentation.
+Real Python also offers a [very helpful guide][helpful guide] to installation on various platforms, including iOS and Android.
 
-Exercism currently supports Python 3.4+.
+Exercism tests and tooling currently supports `Python 3.8+`.
+
+[helpful guide]: https://realpython.com/installing-python/
+[using python]: https://docs.python.org/3/using/index.html