title: Can't update Xcode 11
body: <p>Trying to update from Xcode 11 GM to 11.1 always fail.</p>
  
  <p>I tried moving /Applications/Xcode.app first... nothing works</p>
  
  <p>This is my commerce log:</p>
  
  <blockquote>
    <p>2019-10-08 12:29:08+01 leviathan installd[556]: PackageKit: Install Failed: Error Domain=PKInstallErrorDomain Code=501 "The package is attempting to install content to the system volume." UserInfo={NSLocalizedDescription=The package is attempting to install content to the system volume.} {</p>
  </blockquote>