Since this version is no longer the "current" release, the standard App Store method may not work unless you have previously downloaded it. Follow these steps for a manual download:
Before starting your download, ensure your hardware and software meet the following minimum criteria: xcode 9 download
To download Xcode 9, you must use the official Apple Developer Downloads page, as the Mac App Store typically only carries the most recent version of the software. Since this version is no longer the "current"
Xcode 9 requires a Mac running macOS Sierra 10.12.6 or later. For the best experience, macOS High Sierra (10.13) is recommended. xcode 9 download
Ensure at least 10GB to 15GB of free space. While the installer itself is roughly 5GB to 7GB, the installation process and subsequent simulators require significant overhead.