Q: How do I upgrade from avast! HOME to avast! PROFESSIONAL?

A: First, there is no need to uninstall your HOME edition.
To upgrade, you have to buy the PROFESSIONAL edition first. Once you buy it, you will receive the license key for the PROFESSIONAL edition. Then simply connect to the Internet and enter the license key into avast!. It will download the missing components from our server and the HOME edition becomes PROFESSIONAL edition immediately.

To enter your license key into avast!:

1. Right-click on the blue a-ball icon in the system tray and select "About avast!..." from the menu.
2. In the window that appears, click on the "License key" button.
3. Enter the license key into the box.
4. Click on the "OK" button.