: If a serial number is required, select "Enter a Serial Number" on the activation screen. Register Online : If you need to generate a code manually, visit the official Autodesk registration page and sign in to get your Activation Code. Troubleshooting Common Issues How to Install AutoCAD 2021

The use of keygens is illegal. Software piracy, including the use of keygens to generate activation keys, infringes on copyright laws and can lead to legal consequences.