I regret to inform you that the "Diptyca" sheet music reader Android software package has been discontinued. This decision was made due to the increasing difficulty of maintaining the app amidst the constantly changing landscape of the Google Play Store.

Specifically, the ever-changing API level requirements and the excessive developer verification requirements have made it unfeasible to continue supporting and updating the application. These changes necessitate a substantial and continuous investment of time and resources, which a small, independent developer is no longer able to provide.

Thank you for your support and understanding.