I want to install an APK from PC to Android device. And because of user\'s Android and generally technical skills, I need to do it as automatically (silently) as possible. So ho
Connect Android device to PC via USB cable and turn on USB storage.
Copy .apk file to attached device's storage.
Turn off USB storage and disconnect it from PC.
Check the option Settings → Applications → Unknown sources
OR Settings > Security > Unknown Sources.
Open FileManager app and click on the copied .apk file. If you can't fine the apk file try searching or allowing hidden files.
It will ask you whether to install this app or not. Click Yes or OK.
This procedure works even if ADB is not available.