Having the DMG installed is only half the battle. To actually use Xcode 11.3.1 alongside newer Xcode versions (if you have them), you need to manage Command Line Tools.
This way, you will never have to scour the internet for a legacy DMG again. You now have a permanent, verified, portable archive of Xcode 11.3.1 ready to deploy whenever legacy maintenance calls.
CoreSimulator service conflicts with a newer Xcode version. Fix: Kill the simulator processes: sudo killall -9 com.apple.CoreSimulator.CoreSimulatorService xcrun simctl erase all
In the fast-paced world of Apple development, the latest version of Xcode is usually the default choice. However, there is a substantial cohort of developers who actively search for the every single day. Why? The answer is legacy support .
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