Failed to install / update on Android

Sometimes Google Play store updates cause problems with Android applications - the app download process gets stuck (e.g. showing 97%) and never finishes. Occasionally errors 907 or 963 may also pop up because of this.

To fix these, check the solutions below:

1. You may need to clear cache and data of the Google Play Store app on your device:
   
   Go to: Settings → Apps → Select Google Play store app → Select Clear Cache
   If that doesn't help, try selecting Clear Data.
   
   
2. It is also possible to uninstall the Google Play update and roll back the app version to fix the issue:
   
   Go to: Settings → Apps → Select Google Play store app → Select More at the top of the screen → Select Uninstall updates.
   
   
3. After that go to the Google Play store and download the GuitarTuna again.

Please also check Google Play Support for more information: Play Store won't load or download apps