Download :
https://raw.githubusercontent.com/fish0il/Xcode-iOS-Developer-Disk-Image/master/Developer%20Disk%20Image/[version]/DeveloperDiskImage.dmg
https://raw.githubusercontent.com/fish0il/Xcode-iOS-Developer-Disk-Image/master/Developer%20Disk%20Image/[version]/DeveloperDiskImage.dmg.signature
[version]: 4.2 ~
Path: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport
Tip: Restart the Xcode