title: running older simulator versions in XCode 4.5
body: <p>I have upgraded my mac mini to mountain lion 10.8 version. and XCode to 4.5
  But now I am not seeing simulator versions other than ios6. However I want to run application on multiple platforms. How should I do that? Because when I am trying to download simulator versions from XCode -> Preferences -> Downloads, I am seeing "No components available".</p>