Free Download of AutoCAD students versions

Students are eligible for downloading a FREE 36 month student version of AutoCAD for use and practice. 

The Autodesk Student Version software incorporates all the functionality of AutoCAD professional licenses, but includes a print banner making the software inappropriate for professional-looking, commercial, or for-profit purposes. Autodesk Student Version software may not be used for commercial or for-profit purposes. Thirty-six month licenses of Autodesk student software are not eligible for product upgrade or transfer to a commercial license.

As per the AutoDesk guidelines mentioned in the official website on Students Download :

Free Autodesk software and/or cloud-based services are subject to acceptance of and compliance with the terms and conditions of the software license agreement or terms of service that accompany such software or cloud-based services.  Software and cloud-based services subject to an Educational license may be used solely for Educational Purposes.