Autodesk offers a 30-day free trial of Civil 3D 2021 (and sometimes 2020 via older links).
A: Yes, Autodesk allows side-by-side installation of different versions. autodesk autocad civil 3d 2020 free download 2021
Autodesk does not offer permanent free downloads of Civil 3D 2020 or 2021. However, you can access it legally through: Autodesk offers a 30-day free trial of Civil
Short answer: No, not for permanent ownership.
Long answer: Autodesk does offer free trials and free educational licenses. pricing is roughly:
Autodesk Civil 3D is now subscription-only (no perpetual licenses). As of 2025, pricing is roughly: