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It should work. From what I've read Catalina has a guardian system that won't let unauthorized apps run. You should be able to look up a way to circumvent that on your end. There isn't much I can do from mine. My Apologies.

oh it’s all good. That’s just Apple is it a 32 bit or 64 bit game? I’ve heard the new software can no longer run 32 bit games which is stupid because now 90% of my library won’t run at all :/

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I'm uncertain.  And don't know how to check. 
When building for Mac, unlike windows, I don't get an option between 32 and 64 bit. That's very strange, and an awful design flaw. on both Apple's and Unity's part.  

Yeah I’ve noticed. I’m a beginner with unity still but i can’t seem to choose if I want to build a 32 or 64 bit version  on Mac. Ohh yeah big flaw on Apples part their getting a lot of hate hopefully they’ll change it back.