title: Downloading content from Apple hosted in-app purchase
body: <p>I have an in-app purchase which is Apple hosted. However I can't figure out how to download the content associated with it.
  I could get the downloadable objects and request the download start:</p>
  
  <pre><code>[[SKPaymentQueue defaultQueue] startDownloads:currentTransaction.downloads];
  </code></pre>
  
  <p>that's when I get lost: what should I do after that?
  I have taken a look at Apple doc and didn't find anything that could possibly help me.</p>
  
  <p>Thx</p>