Select the Python 3.6.7 version to download from https://www.python.org/downloads/. For IPython, you should be able to type
pip install ipython in your terminal.
1) Go to https://els.comotion.uw.edu/licenses/88 and fill out the form for a free academic license for PyRosetta
2) Download PyRosetta and user your terminal to navigate into the folder it creates
3) I recommend moving that folder (ex. PyRosetta4.Release.python36.mac.release) out of your Downloads directory and into your home directory (remember ~/)
4) cd into the setup directory and type
python3.6 setup.py install (you may need to add sudo before the python part if your computer says you don’t have permission