Visit the Autodesk Education page, create an account using your institutional email, and verify your status with documentation (like a student ID or transcript). Once verified, you can select "Civil 3D" and choose the 2021 version from the dropdown menu. 2. The 30-Day Free Trial
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If you are a professional or a hobbyist who does not qualify for the education plan, the free trial is your best option. Visit the Autodesk Education page, create an account
Files created with the educational license will have a watermark when printed/plotted. You cannot use this version for commercial paid work. Visit the Autodesk Education page