You may see this popup when the installed Zucoin wallet app came from an old, deprecated download source.
The warning can say: "This app needs to be replaced with a new app. It's from a very old source."
This can happen even if you recently installed the wallet app, because the app was installed from an old source.
You will need to migrate the old wallet app to a new wallet app carefully.
Follow the steps here: How do I reinstall the Zucoin wallet app?
How do I backup my Zucoin wallet app data?
How do I restore my Zucoin wallet app data from a backup file?
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