Download File Ndasat_base.apk -

Go to Settings > Apps & Notifications > Special App Access > Install Unknown Apps .

If you missed the notification, open your Files app, go to the Downloads folder, and tap NDASAT_base.apk . Download File NDASAT_base.apk

Tap Open to start the app or find it in your app drawer. Go to Settings > Apps & Notifications >

Once the download finishes, tap Open in the browser notification. open your Files app