If your device is linked to multiple Google accounts, then it is important to make sure you download Ultimate To-Do List using the account you purchased under. If you have installed the app and your license purchase is not detected, here's what to do:
- If you don't know which Google account you purchased the license under, visit payments.google.com to look up your order.
- In Ultimate To-Do List, go to the backup and restore section of the app's settings and make a backup.
- Uninstall the app.
Go to Google Play, tap on the menu in the upper left corner of the screen, and switch to the account you purchased the license under. If this account doesn't appear, then you need to add it in the Accounts area of your device's settings.
- Download and install Ultimate To-Do List.
Run the app and choose the option to restore from backup.
The license should be detected now.