I’ve installed Xcode 11.3 from a zip file not from the app store and now Xcode 11.4 is here and I need it to work with ios 13.4 so how can I update it without downloading the whole Xcode again from apple downloads?
you don't need to download the xcode again just Download 13.4 & mount from below link
https://github.com/iGhibli/iOS-DeviceSupport/tree/master/DeviceSupport
Open to see its content and copy Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/13.4 to same path into Xcode application directory.
Restart Xcode
