Buy a license from the official site or retrieve a lost key using the Official Key Retrieval Page by entering your purchase email. Open Settings: Launch the app on your Android device and tap the Gear/Settings icon Enter Code: Look for the "Activate" Paste & Verify:
: A license key is only required to activate premium features (like unlimited downloads or channel subscriptions) on the desktop versions for Windows, macOS, and Linux. 4k Video-- Downloader License Key For Android