As of the app release v1.3.4 on August 5, 2022, the "Legacy App" does not serve a purpose. Use the current app instead:
As of August 8, 2022, we will be removing the Legacy App from all app stores. Because app stores may refresh at different times in different geographic areas, you may still see the Legacy App available.
If you download it by accident, it will automatically direct you to the current OtO Lawn app.