/iOS-device-support-files

iOS 12 not supported by Xcode 9.4 : Could not locate device support files

iOS-device-support-files

iOS 12 not supported by Xcode 9.4 : Could not locate device support files

To use: download and copy iOS-device-support-files to

/Applications/Xcode/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport

open Applications folder in Finder, right click on Xcode and "Show Package Contents"