When trying to run my test app on my iPhone 7, I got this message:
could not locate device support files.
This iPhone 7 (model 1660,1778, 1779, 1780) is running iOS 13.1.2 (17A860), which may not be supported by this version of Xcode.
My Xcode is version 10.1. I tried to update Xcode to latest from App Store. It never works - the coloured ball keeps spinning. What I can do?