Big Sur (beta 2) Exiftool instal

Has anyone had success installing exiftool under Big Sur (beta 2 is what I'm trying.)

I can run the installer (which isn't signed so right click/open works) but the installer kicks me out saying that it's from an unknown developer. Is there a similar way to override that check on a package installer?
Big Sur (beta 2) Exiftool instal
 
 
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