[Zubersoft]

If you purchase from Google Play, open the play store app, slide out the tray from the left side, tap "My Apps & Games", then tap the update option next to MobileSheetsPro. Alternatively, you can just search for MobileSheetsPro and tap the update button on the app store page.

As for the issue with touching the letters and it not working, do you have any other issues with touch detection on that device? If you tap the right side of the screen to turn the page, are there any situations where it sometimes doesn't turn a page when you do this? Or is this specific to the alphabet letters on the library screen?

Thanks,
Mike