Using version 19.10.13 had the same issue, repeated to open the app a couple of times and it comes up with a different warning which lets you overide if you click that you trust the app software.

RE: Mac is upgrading the O/S to 64 bit Catalina soon

Tut Split this topic October 10, 2019, 3:22am 3

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Mac is upgrading the O/S to 64 bit Catalina soon	22	1436	January 18, 2023
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