If you need to reinstall an Avira license onto your computer, the easiest way is to go directly through your Avira account. Once you’ve logged in, you’ll have access to all of your license information in one convenient place.
If you want to install and activate your software manually instead, feel free to get your installation file from the Avira Download Center.
This Avira Support article contains detailed activation instructions.
For any further questions about how to install, activate or use your Avira product, you can reach their dedicated support team at this location.