Install the most recent version of PsychoPy (https://github.com/psychopy/psychopy/releases/).
Download the .dmg installer for mac or the .exe installer for Windows.
You will also need VLC media player in order to play media. It is free. (https://www.videolan.org/vlc/index.html)
On Windows, you may need to install some movie codecs into PsychoPy directly. See Windows-specific troubleshooting
Download the latest release of PyHab as a .zip file (https://github.com/jfkominsky/PyHab/releases).
Unzip the folder anywhere you would like. Then, see Quickstart guide