We made some important changes according to the Google Play Store app policy that required us to stop supporting previous versions of the Doroki POS app. We had to upload a brand new Doroki POS app to the store, which you have now downloaded. This means that the old versions will be unavailable for use and can be deleted. But no worries, you will have uninterrupted access to the new Doroki POS app you’ve downloaded from the Play Store.