If you're looking to apply legitimate patches or updates to AutoCAD 2016, here's how you can do it:

: Open the software and select "I have an activation code from Autodesk." This will display a Request Code X-Force Keygen Execution

Once the patching process is complete, launch AutoCAD 2016 and click on "Activate" when prompted. Select "I have a license" and enter any valid license information (e.g., name and organization).

The Xforce patch tool will create a keygen file. This file will be used to generate a valid activation code.