Cannot install Support repository and sync project in Android Studio

Question

I am trying to use the support libraries of version 25.2.0 so I will be able to use the CameraKit library.

I have got the newest build tools downloaded:

Answer 1

I had to add the following to my project level build.gradle. Then the button to install and worked.

allprojects {
    repositories {
        maven {
            url "https://maven.google.com"
        }
        jcenter()
    }
}