1. Before everything else, you should allow your device to install apps from unknown sources (Apps outside Google Play Store).
2. In main menu click on ”Settings”.
3. Go to ”Security” menu.
4. In ”Security” menu you should check/allow to install apps from unknown sources
5. After you allowed your device to install apps from unkown sources you can download Roulette Gaja Online android app: www.roulettegaja.com/download After download you can easily install app on your android device.