Do not attempt to install custom python version, just use system default

scripts/setup-osx.sh

@@ -1,8 +1,9 @@
 #!/usr/bin/env bash
-wget "https://www.python.org/ftp/python/${PYTHON}/python-${PYTHON}-macosx10.6.pkg"
-sudo installer -pkg python-${PYTHON}-macosx10.6.pkg -target /
+echo "Upgrading pip"
 sudo python3 -m ensurepip --upgrade
-# A manual check that the correct version of Python is running.
+echo "Checking python version"
 python3 --version
+echo "Installing app requirements"
 python3 -m pip install -r requirements.txt
+echo "Installing packaging tools"
 python3 -m pip install PyInstaller==3.6