Unfortunately the current version of Key has a bug which causes it to crash in the Purchase Premium screen. This is also the place where you would be able to restore the subscription. We have made a fixed version which is currently waiting for Apple to review and publish it in the AppStore. It should be available for download during next week.
We have also heard other reports of Key crashing on some iOS devices and are now investigating the cause.
Can you help to check if the issue is still persist in the latest release?
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