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If you have a physical USB or DVD, check the label on the product packaging. Local File (MID.txt): autocad civil 3d 2016 serial number product key
If you hold an active subscription to the current Civil 3D, you are legally entitled to download and install Civil 3D 2016. Your current subscription serial number (different format) works with the 2016 product key 237C1 . Log into your Autodesk Account, find "Previous Versions," and download the official installer. The installer progress bar crawled across the screen
Product keys distinguish between standalone versions and those included in a suite. If you are installing Civil 3D as part of a package, use the corresponding key: AutoCAD Civil 3D 2016 (Standalone): Infrastructure Design Suite Premium 2016: Infrastructure Design Suite Ultimate 2016: AutoCAD LT Civil Suite 2016: Microsol Resources Related Resources Complete
The Product Key is a five-digit code that acts as an identifier for the specific Autodesk product you are installing. Because Autodesk packages (like the Architecture, Engineering & Construction Collection) contain multiple software titles, the Product Key tells the installer exactly which application is being licensed.
AutoCAD Civil 3D 2016: Finding Your Serial Number and Product Key