Exceptionally stupid error message when attempting to use a store's iOS app. There is no newer version of iOS.
The the app announced by another error message that the app itself no longer worked and a newer, better version had replaced it.
Then the app reverted to a poorly-displayed version of the website, all COMPLETELY WITHOUT ANY LINKS to the new version. I had to find that with a manual search of the app store.
WANKERS.
