Running macOS High Sierra 10.13.6 does not mean you have to be locked out of Xcode development. While you cannot install the latest version from the Mac App Store, you have a clear path forward: download Xcode 10.1 or Xcode 9.4.1 directly from Apple's developer website.
Every version of Xcode has strict macOS compatibility requirements. If you try to run a version that is too new, your system will block it. If you run a version that is too old, it might lack modern features or support for newer programming languages. download xcode for mac os high sierra 10136 work
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Since Apple's downloads page lists dozens of Xcode versions, the quickest way to find what you need is to search: If you try to run a version that
Once Xcode 10.1 is running, you need to configure it specifically for High Sierra.