After downloading the free version of Avast! Antivirus software, you are required to enter a license key after the 30- to 60-day free trial to continue using the software without any interruption to service. The key is 16 characters long. After you register for the free version of Avast!, the license key is sent to your email account for insertion into the software in the appropriate location.
Open the Avast! user interface control panel from the taskbar. Right-click the Avast! icon, and select "Open Avast! User Interface."
Click "Maintenance" located in the panel on the left side of the interface. Click "Registration" underneath "Maintenance."
Click "Insert Avast! Free Antivirus License Key." A new box opens. Type the code you received in your email account into the "License Key" box.
Click "OK" when finished. Your software is now registered for 1 year. At the top of the registration page, the current status will say "Registered." It will also tell you when the software will expire, which will be in 1 year.
Tips & Warnings
- Avast! Antivirus Free must be registered each year. A new license key is sent to your email after you register for a new license key.
- Avast! Antivirus starts warning you 1 month before the software license key is going to expire.