You may want to reset Mathematica’s licensing information if you used the incorrect activation information to activate your copy of Mathematica, or if you want to upgrade to the professional version of Mathematica.
- Navigate to the menu item Help ► Enter Activation Key.
The Wolfram Product Activation window appears with your old activation key.
- Replace the old activation key with your new activation key.
- Click Activate to confirm.
- Restart Mathematica to use it with the new licensing information.