Xcode 4 in my Mac App Store says its installed, but it's not

I can't seem to re download xcode 4 as the mac app store thinks that I already have it. I've had this problem before with another app, but could really do with a solution to this problem now as I need xcode for a new work project.

Any help开发者_运维技巧 anyone could offer would be much appreciated.

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What you download from the app store is actually the Xcode installer, not Xcode itself. You might have the installer knocking around somewhere even if you've removed Xcode.

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Execute the downloaded installer located at

/Applications/Install Xcode/Install Xcode.app

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Follow the steps:

1. Open Xcode → About Xcode ( Check the Version)
2. If the version is not 4.2
3. Search → App Store → Click on "App Store" result → Search Xcode → Click "Update Xcode
4. After update, it will not update Xcode automatically.
5. Search "Applications" → Click "Applications" folder.
6. Sort by "Date modified", Select Name: "Install Xcode" Size:1.81 GB Kind: Application.
7. Click "Install Xcode". (Follow the steps)
8. After Update, check the Version. It will be 4.2.1

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Are you sure? See Macintosh HD/Developer/Applications