The ‘light’ (43.3M) zip file assumes that you’re using a mobile device that may not have access to a flash-enabled web browser, with somewhat simplified graphics, so as to speed up redraw times on the slower processors on mobile devices.
The ‘full’ (75.7 M) zip file assumes access to a flash-enabled browser, and is engineered for desktop or laptop computers.
Both files contain all the text, significant graphics and links to the pdf support files. Only the full version contains links to the interactives. You can view either version with any civilised/ compliant pdf viewer.
The navigation has been simplified and enhanced. Technical comments here. Comments on teaching here, and on supporting teachers, here.
The final part of the SPT 14-16 trilogy will be out later this year (calendar).