Thanks that worked fine. I entered this as two lines in a terminal window and it worked great! Just copy and pasting it as one line of course didn't work) For some reason I can't get my response to be multiple lines either. `cd /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport  (newline) sudo ln -s 15.5 15.7

It is now fixed.