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When I try to download the Xcode 4.4 update I'm presented with this error:

Xcode can’t be installed on “Mac HD” because the version of OS X is too new.

But the change log says that the update is for Lion and Mountain Lion.

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Also deleting Xcode then trying to download from MAS results in the same error. – Steve Moser Jul 26 '12 at 3:18
Can we assume that sw_vers has 10.8 and a build version of 12A269 on your Mac? – bmike Jul 26 '12 at 3:30
Yes, 12A269. So no MAS update for GM? – Steve Moser Jul 26 '12 at 3:31
I have the same issue v4.4 cannot be installed, 12A269 – aCuria Jul 26 '12 at 7:52
up vote 7 down vote accepted

You can manually clear the store where the App Store saves the downloads before completion:

  1. Quit the App Store app
  2. Open (search with Spotlight)
  3. rm -r /private/var/folders/*/*/*/

    This step is the removal part...

  4. Restart the App
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