title: Xcode 9: Block-compressed payload operation failed
body: <p>MacBook Pro El Capitan (10.11.6) here. I'm trying to install Xcode 9 so that I can play around with <a href="https://developer.apple.com/arkit/" rel="nofollow noreferrer">ARKit</a>. From the Apple Developer's site, the only version of 9 I can find is <code>Xcode_9_beta_6.xip</code> (please correct me if I'm wrong!), so I download it:</p>
  <p><a href="https://i.stack.imgur.com/pAcGQ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/pAcGQ.png" alt="enter image description here" /></a></p>
  <p>Then I extract &amp; run the XIP file:</p>
  <p><a href="https://i.stack.imgur.com/Ril31.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Ril31.png" alt="enter image description here" /></a></p>
  <p>But that operation fails due to this strange error that Google doesn't really help me out with (at all):</p>
  <blockquote>
  <p>The operation couldn't be completed. Block-compressed payload operation failed</p>
  </blockquote>
  <p><a href="https://i.stack.imgur.com/ntoIC.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ntoIC.png" alt="enter image description here" /></a></p>
  <p>Any ideas what's going on here?</p>