title: Xcode 4.1 can't reinstall. App store says "installed"
body: <p>Today i update my system to Lion and try to update Xcode.
  After downloading from app store i get error.</p>
  
  <p>So i remove my old Xcode 4.0 by this command</p>
  
  <blockquote>
    <p>/Developer/Library/uninstall-devtools –mode=all</p>
  </blockquote>
  
  <p>But now in app store i have the status "installed" and can't reinstall my Xcode.
  So what i must do?</p>
  
  <p>p.s Trash is clear.</p>