Follow the steps below for activating your license for MAGNET Modeler for Autodesk. Note that once you have activated your license, it cannot be transferred to another device. Modeler for Autodesk license doesn't support the Check Out/Check In of the license.
The license activation dialog opens when clicking on the MAGNET Modeler tab in Autodesk for the first time after installation.
Here you can see the tab in Autodesk Civil 3D:
The following window opens. Click on "Activate license":
Log in using your Topcon credetials and click "Next":
Enter your license serial number and click "Next":
Accept the license agreement by clicking "I accept":
Product is now licensed for use: