How to Tell if Your Mac is 64-bit

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How to Check for 32-bit Apps on Your Mac in 4 Easy Steps? - 3uTools

How to check which Mac apps are 32-bit and won't work in macOS Catalina

What's the Difference Between 32-Bit and 64-Bit? - The Plug - HelloTech

Is My Computer 32-bit or 64-bit? – Shopfront

How to see which applications on your Mac are 32-bit and won't be supported in the future - macOS Discussions on AppleInsider Forums

The Evolution of Mac OS

Will Endnote for Mac x8 Support 64-bit by Fall - EndNote General - Discourse

How to know if I am running on a 32-bit or 64-bit Mac OS - Quora

32-Bit Apps 'Not Optimized for Your Mac' No Longer Working on macOS Catalina - MacRumors