How do I install an APK file on my Android device?

The easiest way is this:

1. Download the APK only from an official source, ideally directly from the developer.
2. Open the file from the exact app you used to download it—for example, from your browser or file manager.
3. If Android asks, allow that specific source to install unknown apps.
4. Then confirm the installation.
5. If Android still blocks the installation, also check Play Protect, Advanced Protection, work profile / device management, or a possible package conflict.

Important: Since Android 8, this permission is granted per source app and no longer globally for the entire device. After installation, you can revoke the permission for that source again if you do not need it permanently. Google also points out that installations outside Google Play can carry a higher risk.