- Open the Settings app.
- Select 'Apps & Notifications'
- Tap Advanced.
- Choose 'Special app access'
- Scroll down to and select 'Install unknown apps'
- Select the app that you will be using to download the file (we suspect it will be Chrome)
What is the alternative for Google Play?
GetJar has been around for a very long time and is even older than the Play Store. It provides more than 800,000 varieties of apps across major mobile platforms, including Blackberry, Symbian, Windows Mobile, and Android.