Rainer,
Send me an email at mike@zubersoft.com. I can work with you to manually update MobileSheets on that device. I still support version 4.0.3 and higher. I've had to split the app into two separate versions now (one for 4.4 and below and one for 5.0 and higher), but this is normally transparent to users as Google Play just installs the correct version for their device. The problem is that Google Play itself doesn't work on devices below 4.2 anymore. The FastSpring version of MobileSheets still works perfectly fine on older devices though, so that's always an option.
Mike
Send me an email at mike@zubersoft.com. I can work with you to manually update MobileSheets on that device. I still support version 4.0.3 and higher. I've had to split the app into two separate versions now (one for 4.4 and below and one for 5.0 and higher), but this is normally transparent to users as Google Play just installs the correct version for their device. The problem is that Google Play itself doesn't work on devices below 4.2 anymore. The FastSpring version of MobileSheets still works perfectly fine on older devices though, so that's always an option.
Mike