Unfortunately, it would seem that the version of the app which you had is no longer supported or able to work as your iOS level is very old.
Your iPad Mini can’t get a high enough level, iOS 11, to run the current version of the app.
The most current level of iOS is 14.2.
It’s sad to say, your iPad Mini is reaching the end of its long life when Apple are no longer supporting iOS on it and more and more apps will also stop working.
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