title: How to check the check-boxes corresponding to API levels in Android SDK Manager?
body: <p>I have installed Android Studio. I am following up a tutorial in the book - <code>The busy coder's guide to Android Development Version 7.3</code>,
  The author pens down -</p>
  
  <blockquote>
    <p>The “SDK Platforms” tab lists the versions of Android that you can
    compile against. The latest version of Android is usually installed
    when you set up Android Studio initially. However, for the tutorials,
    please also check “Android 4.4.2” and “Android 5.1.1” in the list, and
    then click the “Apply” button to download and install those versions.</p>
  </blockquote>
  
  <p><a href="https://i.stack.imgur.com/edkTo.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/edkTo.png" alt="enter image description here"></a></p>
  
  <p>However, I see that the check-boxes corresponding to the <code>API levels</code> are <code>disabled</code> by default &amp; I am unable to click them.</p>
  
  <p>Any suggestions?</p>