1. After downloading the APK file, find it in the notification bar or in the 'Files' app and tap on it.
2. If you see a 'Permission to install apps from unknown sources' message, follow these steps:
3. After allowing the permission, go back and open the APK file again.
4. Tap 'Install' and wait for the installation to complete.
5. Once the installation is done, tap 'Open' to start using the app.
Note:Make sure you grant all permissions. For your safety, only install from this link.