For the EDU (educational) sites that run the Autodesk Education Master Suite, if you are on Subscription, it will allow you to run 3 versions back from the following products listed below:
We have recently found out that AutoCAD Civil 3D 2011 will not license from this Suite. We are working with our IT team to get the license generated correctly. If you need access to AutoCAD Civil 3D 2011, please log a case with product support via the Subscription Center.
Thanks to Alison Gangler for alerting us to this issue.