How to run/install app in iOS 13 device from the Xcode 10.2.1 using device supported file
Make sure you name the folder to match the exact version, i.e. 13.0 (17A5508m)
I downloaded the Developer disk image for iOS 13.0 from here and added support file in Xcode Version 10.3 (10G8).
https://github.com/iGhibli/iOS-DeviceSupport/blob/master/DeviceSupport/13.0.zip
All other devices support list.
https://github.com/iGhibli/iOS-DeviceSupport/tree/master/DeviceSupport
Follow These steps.
Unzip downloaded file. Right click on Xcode and click on Show Package Content. Then paste your file on path.
Applications -> Xcode.app -> Contents -> Developer -> Platforms -> iPhoneOS.platforms -> DeviceSupport
Then at last restart your Xcode.
It works for me.