AutoCAD Versions, Serial Numbers, and Product Keys – A Complete Guide AutoCAD, developed by Autodesk, has released multiple versions over the years, each packed with new features and performance upgrades. To install and activate AutoCAD properly, you need a Serial Number and a Product Key . In this blog, we’ll explain what these are, why they are important, and provide a reference list of product keys for different AutoCAD versions. 1. What is a Serial Number? A Serial Number is a unique code provided by Autodesk when you purchase or register AutoCAD. Example format: 400-12345678 It is required during installation and activation to validate your license. 2. What is a Product Key? A Product Key is a 4–5 digit code that identifies the specific Autodesk software you are installing. Each Autodesk product (like AutoCAD, Revit, Civil 3D, etc.) has its own product key. Without the correct key, the software won’t install or activate. 3. How to Find Your AutoC...