Hello Paul,
Please be informed that in the recent update the AVG Zen was removed from AVG apps in Android.
Hence, it is not possible to activate AVG subscription on Android device via AVG Zen.
Instead, please uninstall existing AVG product in Android device and install AVG Antivirus by following below steps:
1. Device Menu -> Settings -> Apps/Application Manager -> AVG -> Uninstall.
2. Restart your device once.
3. Open Google play store app on your device.
4. Search for AVG Antivirus.
5. Locate and install the free version of the app.
6. Now open the installed app.
7. Tap on drawer (3 lines) on top-left of the app.
8. Select AVG Account.
9. Enter your My Account email address and password.
The paid app should get installed automatically.
In case of difficulties or error, please reply with the screenshot of error and we will help you further.
The standard way to capture a screenshot using an Android device is to hold the power key and volume down key together.