Because the Mac App Store usually only lists the most recent version of Xcode, you must download older versions directly from Apple's developer resources.
Installation is straightforward: open the .dmg and run the .pkg installer. Download Xcode For Mac Os High Sierra 10.13.6
Double-click the Xcode_10.1.xip file. macOS’s Archive Utility will begin expanding it. This will take 10–30 minutes depending on your Mac’s CPU (older Macs will take longer). Do not interrupt the process. Because the Mac App Store usually only lists
However, that doesn’t mean you are locked out of app development. If you need to build, test, or maintain legacy apps, or simply need an older version of Xcode that is compatible with High Sierra, you have come to the right place. or maintain legacy apps