Product activation verifies that a product license is valid so that you can access the software. The verification method depends on what license type you have, and where and how you download the software. In some cases, you don't need to activate at all. You just sign in.
Note: Autodesk no longer supports offline activation for 2021 products and later. If you have a perpetual license, you can activate your software by going online only once. After you activate online, you can continue to use 2021 software and later offline. This change doesn't apply to subscription network licenses or previous versions that you already activated offline. You can continue to use them as before.
If you have a single-user subscription, your product is activated when you sign in to your software.
Note: You don't need an activation code if you have a subscription license.
How to activate by signing in
Start your software.
On the Let's Get Started screen, click Single-user (versions 2019 and later) or Sign-In (versions 2018 and earlier).
Sign in using your Autodesk ID (the email and password) associated with your Autodesk Account.