title: Trouble installing Android 4.2 APIs
body: <p>I updated ADT through Eclipse today to version 21. Now when I open the SDK Manager I would expect there to be a folder like "Android 4.2 (API 17)", which would contain the SDK Platform and APIs, documentation, etc. However, instead I just get a folder called "API 17", and the only thing in it is "Google APIs", which I can't even install because </p>
  
  <blockquote>
    <p>Installing this package also requires installing:
    - Missing SDK Platform Android, API 17</p>
  </blockquote>
  
  <p>What do I do here? Thanks</p>