3. On your Home screen, tap the Avast Cleanup icon to open the app, select Get started, then choose Already purchased?(if you switched to a free version with ads, go to ☰ Menu, and select My subscription).
4. Select Use an activation code.
5. Type the activation code you received with the product into the text box, and tap Use this code(if asked, enter your name, email, and postal code). See detailed activation instructions