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There is no video I can send you. The app doesn't start. I get an error message, which is in German and says exactly what UnoTheCard already posted. It includes a button with a question mark. If I click that button, I get to the explanation telling me "The app has been modified and its code differs from the original signed code." My machine is a mid-2012 MacBook Pro Retina running Catalina. Hope that helps.

I have the same problem with 1.2 on Catalina. The "unidentified developer" message is something different. I get that too with other apps and know how to fix it. It's not that.