I've downloaded and installed the GO app from the App Store, It starts and the "Download a Map" screen shows, but then it immediately says "Oops - Something has gone wrong". And that's it: no help, no info, no links. The "Try again" button doesn't work. All I can do is stop the app. Done all the usual things (deleted/reinstalled/restarted/reset settings/different AppleID/cleaned iPhone/etc., etc.)
I did have the app installed before, then deleted it. Has something been left behind that prevents a new install from working?
(Don't want to reset my whole iPhone, btw.)
How can I install and use this app?