Why can i not download apk files?

[Android Central Question]

Hello, i need some help as i am having trouble with downloads. Whenever i try to download a apk file and i get to the download screen the "install" button is grey and will not work with anything i try so if someone would help me then i would be grateful

 

[Thacy]

What's your phone and OS version? In order to install APK files, you need to turn on Unknown Source on Settings. The exact path varies on different OS. On Android 5.1 and over, the search box on Settings should help you find the option.