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Upgrading your license to an in-app purchase eliminates the need to download a separate license or re-enter a registration code whenever you upgrade or reset your devices. An in-app purchase will work on all of your devices (both smartphones and tablets), and will be automatically installed whenever you download Ultimate To-Do List from Amazon or Google Play.
To upgrade, make sure your existing license is installed and then visit the "Add-Ons" area in the app. You will see an upgrade option listed.