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Xcode 7
7.0 : https://developer.apple.com/services-account/download?path=/Developer_Tools/Xcode_7/Xcode_7.dmg
Xcode 6
6.4: http://developer.apple.com/devcenter/download.action?path=/Developer_Tools/Xcode_6.4/Xcode_6.4.dmg
6.2: http://developer.apple.com/devcenter/download.action?path=/Developer_Tools/Xcode_6.2/Xcode_6.2.dmg
Xcode 5
Xcode 4
Even Older Versions