Hi! Please try the following: 1. Uninstall the existing app 2. Open the Google Play Store app 3. Search for TimeTree and install. More about troubleshooting on this page: https://support.google.com/googleplay/answer/14122894. You can also access calendars from here: www.timetreeapp.com/signin. If you need help, contact us: support@timetreeappcom.