Where is xCode 4.3?

Head First iPhone & iPad Development 2nd Edition says to download Xcode from http://developer.apple.com/IOS. It also says that book is based on xCode 4.3. Latest that is available to download is xCode 4.2 which I downloaded and installed to my MacBook Pro. It looks different and it is somewhat difficult to follow the examples in the book. Where do I download xCode 4.3?
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