To activate Avast Internet security, first you would need to have the latest version of Avast Premier 2019 (recommended) or 2018 installed on your Windows PC. Usually the download link and installation instructions will be sent to you after purchasing a license from (please see below).
1- Right-click the Avast icon in your system tray and select Subscription information.
2- On the My licenses screen, click Enter a valid activation code.
3- Type or paste your activation code into the text box and click Enter:
4- Check your license details for the entered activation code. If you have an activation code for interchangeable products, you can click on a listed item and select an alternative license from the drop-down menu. Then click Continue to return to the My licenses screen.
Enjoy your security with AVAST!
Please feel free to contact us if there is anything we can help you with.