Don't be alarmed by Google's warning message. It's because lottery apps aren't allowed in the Play Store yet. It will not harm your device and is completely secure.
Once the download is complete, pull down the notification panel from the top of your screen and tap elottohub.apk to install.
After opening the install file, you may receive a security prompt. Tap 'Settings' & turn on 'Allow from this source' or 'Unknown sources'.
Si no vuelve a la instalación de la aplicación automáticamente, toque 'Atrás' para completar la instalación y comenzar a jugar en Elotto.