64-bit games for Mac: The future of Mac gaming. The removal of 32-bit support caught many by surprise. Many saw it as an aggressive move that hurt both consumers and developers alike and were quick to call out Apple. Apple’s decision could be debated at length, but the move to 64-bit was a necessary move. MacOS 10.14 Mojave, the version of the Mac operating system before the new macOS Catalina, is the last version that supports 32-bit software.With Catalina, only 64-bit software will be supported.
Apple began transitioning to 64-bit hardware and software technology for Mac over a decade ago, and all modern Macs now include powerful 64-bit processors that can run advanced 64-bit apps. These apps can access dramatically more memory, enable faster system performance, and take advantage of technologies that define today's Mac experience.
Apple has been working with developers to transition their apps, and in 2018 Apple informed them that macOS Mojave would be the last version of macOS to run 32-bit apps. Starting with macOS Catalina, 32-bit apps are no longer compatible with macOS.
If you get an alert about a 32-bit app
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You will see one of these alerts when attempting to open a 32-bit app:
[app name] needs to be updated.
The developer of this app needs to update it to work with this version of macOS. Contact the developer for more information.
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[app name] is not optimized for your Mac and needs to be updated.
This app will not work with future versions of macOS and needs to be updated to improve compatibility. Contact the developer for more information.
When installing macOS, you may see a list of recently used apps that are 32-bit. You can review this list before deciding to continue installation. You may also see a prohibitory symbol over the icon of each 32-bit app in the Finder, letting you know that the app will not open.
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For all 32-bit apps, please contact the developer of the app to learn whether an updated version of their software is available or planned.