While using Avast Free Antivirus, you could be offered a free trial of Avast Internet Security. If you accept the offer, your program will update to the latest version of Avast Internet Security for a free 20-day trial period. You can always switch back to Avast Free Antivirus, or purchase and insert a license file to continue using a paid version of Avast Antivirus.
Upgrade to the trial version of Avast Internet Security
Avast Free Antivirus may display a pop-up message offering you a free trial version of Avast Internet Security.
- Accept the offer by clicking Start free trial.
- Your program updates itself to the latest version of Avast Internet Security.
- Click Restart now.
- Click Settings ▸ Subscription to review your subscription details.
You can manually upgrade to a trial version of Avast Internet Security upon registering Avast Free Antivirus. For detailed steps, read the following instructions:
Switch back to Avast Free Antivirus
If you would like to discontinue use of Avast Internet Security, you can easily switch back to Avast Free Antivirus:
This process applies to users who are switching from the free trial version of Avast Internet Security back to Avast Free Antivirus. If your paid version of Avast Antivirus has expired, the program will switch back to Avast Free Antivirus in two weeks. You can manually switch back to Avast Free Antivirus by following the steps in this article:
- Right-click the Avast
icon in your system tray, and click Subscription information. 
- Click the arrow next to Other options. Then click Switch me back to Avast Free.
- Click Restart now to restart your PC and complete the update.
- Avast Internet Security 17.x
- Avast Free Antivirus 17.x
- Microsoft Windows 10 Home / Pro / Enterprise / Education - 32 / 64-bit
- Microsoft Windows 8.1 / Pro / Enterprise - 32 / 64-bit
- Microsoft Windows 8 / Pro / Enterprise - 32 / 64-bit
- Microsoft Windows 7 Home Basic / Home Premium / Professional / Enterprise / Ultimate - Service Pack 1, 32 / 64-bit
- Microsoft Windows Vista Home Basic / Home Premium / Business / Enterprise / Ultimate - Service Pack 2, 32 / 64-bit
- Microsoft Windows XP Home / Professional / Media Center Edition - Service Pack 3, 32-bit