Step 1 Click on flashlight.apk and "View Raw" that should download the apk.
Step 2 Transfer flashlight.apk to your phone.
Step 3 Enable installation from unknown source.
Samsung Galaxy s2 with android version 4.1.2 Setting>Device administration>Unknown sources, activate that oneStep 4 Click on the flashlight.apk and start the installation.
Step 5 Done! you now have a flashlight without advertising and asked all the time to rate the app!