Windows users are encouraged to download the installer, it contains all necessary language packs and activities.
If you want to help develop Schoolsplay or just want to run from sources, you can download the zip file. Beware that you will need Python and other dependencies!
Python 2.4 or higher - www.python.org
PyGame 1.7 or higher - www.pygame.org
OcempGUI 0.2.4 or higher - ocemp.sf.net
wxPython 2.6.3 or higher - www.wxpython.org
SQLAlchemy 0.2.8 or higher - www.sqlalchemy.org