Autodesk no longer provides direct downloads for Civil 3D 2020 to new users, but if you have a valid subscription, you can download older versions via the Autodesk Account portal. Without a subscription, you cannot legally obtain 2020.
However, if you must use 2020 specifically (for compatibility with an existing project), your only legal path is to purchase a current subscription (e.g., Civil 3D 2025) which includes the right to download and use previous versions alongside the current one. Autodesk no longer provides direct downloads for Civil
Autodesk offers a 30-day fully functional trial of Civil 3D (current version, not just 2020). No credit card required. This is ideal for short-term projects or evaluation. Autodesk offers a 30-day fully functional trial of
Legal, perpetual licenses for Autodesk 2020 products are no longer sold, but some authorized resellers may have transferable licenses from firms that closed. Expect to pay $2,000–$3,000 one-time. Always verify with Autodesk’s license transfer process. Legal, perpetual licenses for Autodesk 2020 products are
Autodesk allows “downgrade rights” for some subscription plans. If you hold a current subscription to Civil 3D 2025, you may legally install and activate Civil 3D 2020 using your existing license.