If you find a valid APK file from a third-party source, the general installation steps are: Enable Unknown Sources:
Players control G.One (modeled after Shah Rukh Khan) to fight against Ra.One's army across various levels and arenas. Mobile Availability and APK Downloads
Save the APK (and sometimes an OBB data file) to your device. Tap the file in your file manager and follow the prompts. Verify Compatibility: