Xcode 4.3 iOS SDK 5.1 Developer Preview 3 ENG/2012 MacOSX | 1.75 GB
Xcode 4.3 is the new version of Apple’s powerful integrated development environment for creating great apps for Mac, iPhone, and iPad. Xcode 4 includes the Xcode IDE, Instruments, iOS Simulator, and the latest Mac OS X and iOS SDKs.
Xcode 4.3 has a streamlined new interface that integrates UI design, coding, testing, and debugging, all within a single window. The embedded Apple LLVM compiler underlines coding mistakes as you type, and is even smart enough to fix the problems for you automatically
I will check, If link dead, I will reupload at here