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by beltex 3151 days ago
You can download Xcode (and many versions past) here, directly: https://developer.apple.com/download/more/

Thus, you can have multiple versions installed simply by having Xcode.app in a different directory or renamed. Just remember to set the active Xcode for command line usage via `xcode-select` (can verify via `xcodebuild -version`).

This is precisely for jumping between various GM and beta versions in case of issues and such. Downloading from the Mac App Store does not give you this control.

Finally, Xcode 9.0.1 has worked smoothly for us so far FWIW.