Genstat edu is a cut-down version of the fully-featured Genstat software: for example, many of the statistical analysis menus are greyed out in Genstat edu so that they cannot be used. You can see the complete list of statistical analysis menus available in the full version of Genstat here.
If you want to purchase the full version of Genstat, either you or your tutor can contact support@vsni.co.uk to make an upgrade request.