To activate AVG with your new license number:
Open the AVG program.
In the menu Options, click Reactivate.
Enter your newly purchased license number in the License Number field.
When prompted, click Restart the application now to complete the activation process.
Note: If you have purchased AVG version that contains other features then your previously used AVG, you will be asked if you want to install those additional features automatically. In such case, confirm the installation and follow the installation wizard.