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update XCode 4 to latest IOS SDK

如何将XCode 4.1(sdk v.4.3)中的sdk版本更新为IOS SDK版本5(最新版本),而不必下载XCode 4.2并重新安装?

In short I do not think its possible. You have to download the relevant dmg and install on your machine. While installing you can give the option of upgrading.

i have just come across this issue. go to application and delete install xcode, then go to app store and download xcode again.

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