: If the Xcode Beta refuses to launch due to an untrusted developer certificate, clear the quarantine extended attribute by running sudo xattr -dr com.apple.quarantine /Applications/Xcode-beta.app .
This specific beta was part of the final maintenance updates for macOS Sierra. Primary Focus
Open Terminal and link your command line tools to this specific beta version using xcode-select :
Are you trying to compile a specific version of code? Share public link
If you possess the Install macOS Sierra Beta.app (extracted from the DMG), you can create a bootable USB drive for testing on legacy hardware.
Open and format a USB drive (minimum 16GB) as Mac OS Extended (Journaled) named Untitled .
If you cannot locate the exact Beta 5 DMG, consider these alternatives:
Gain access to newer SDKs for iOS, watchOS, and tvOS that were being developed alongside the desktop OS.