How to Install a Third Party App in Android.
Most apps are available for download and install easily via the Play Store. If you have a third party app that is only available from sources other than the Play Store and you think it's useful and secure to install, the Android system allows you to do so after changing the settings.
- Run the Settings app and tap Security under PERSONAL.
- Tick "Unknown sources" under DEVICE ADMINISTRATION.
- Tap "OK" to the system reminder that your device and personal data are more vulnerable to attack by apps from unknown sources.