The current release at the time of this post is 2012. What are you trying to accomplish? Student version?
Please review the Autodesk Educational Community FAQ for your answer:
If you are unable to resolve your issue, please submit your request to the Education Community Support Team:
For serial number requests on student versions of Autodesk products, please see the sticky post at the top of the forum.
Or contact a Reseller for a full licensed copy.
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