: Sign in at manage.autodesk.com. Go to All Products and Services , find Civil 3D 2021, and click View Details or License Details to see your specific serial number.

To get the most out of your AutoCAD Civil 3D 2021 license:

. In the window that appears, look for "Product Information" or "Manage License" to view the serial number. Installation Media

If you are unable to locate your unique serial number, try these methods: Transition to a named user subscription model - Autodesk

: For physical media or original download folders, look for a text file often named