SeaMonkey 2.53.3 Won't Open

[Michael F. Simon]

I just installed SeaMonkey 2.53.3 on my iMac running Catalina. After 
putting the app in the Applications folder, double clicking it produced 
an Alert, of which the attachment is a picture. It's apparently not at 
the the Mac App Store. How can I download a copy of SeaMonkey 2.53.3 
which meets Apple's requirements for its opening?

Thanks for any help you can give me.
Mike Simon
Portage MI
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