First of all go to your Android phone settings and right under Security, click and enable “installation of applications from Unknown Source”. Next, go to the download Folder where the app was stored after downloading from above Link and click on the app to start installing on your device. When the app installation is successfully completed, then open the app and register or login with your correct details. Recall that bet9ja app doesn't work offline, it requires internet connection before it can connect online or work.