Installing applications that are not on Google Play requires you to enable a certain permission in the settings so that the whole process goes down smoothly. If you're downloading one of these third-party applications (in the form of an APK), you'll need to enable Unknown sources.
To do this, follow these steps—
- Open Settings on your Note 2 or 3
- Go to the General section
- Tap on Security
- Check the box next to Unknown sources
Once this is done, you should be able to successfully download and install any third-party applications not available on Google Play.
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