Unfortunately my developer account has been removed from the Google Play store because I will not agree to let them post my home phone number and home address in the Google Play store.
The ToDo Task Manager application that is available from the Amazon store is still available and working. It is the same application with the same features. To switch from the Google version to the Amazon version just download ToDo Task Manager from the Amazon store and it will replace the Google version.
On some devices you can bypass the license error message on the Google version of ToDo Task Manager by putting your device in airplane mode.