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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, such as Metal graphics acceleration.

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.

Apple's transition to 64-bit technology is now complete. Starting with macOS Catalina, 32-bit apps are no longer compatible with macOS. If you have a 32-bit app, please check with the app developer for a 64-bit version.

Opening 32-bit apps

But it’s a quiet shame for games that helped push Steam’s presence on Mac, boosting the wider Mac gaming scene as a result. Prolific Mac porting house Aspyr have shortlisted several games for 64-bit updates, including The Sims 2, Civilisation V, and RollerCoaster Tycoon 3. Aspyr ends 32-bit Mac game sales in shift to 64-bit support only. By Malcolm Owen Monday, June 17, 2019, 06:37 am PT (09:37 am ET) Game publisher Aspyr is ceasing sale of its 32-bit Mac game. Oct 01, 2019  It would need to be 64 bit because MacOS Catalina will be dropping all support for 32 bit applications. If Portal 2 or any other game is not updated to 64 bit then it will no longer run on Mac operating systems after the next version is released.

When you attempt to open a 32-bit app, you will see an alert that the app needs to be updated to work with this version of macOS, or that the app is not optimized for your Mac and needs to be updated.

macOS Catalina

macOS Mojave and macOS High Sierra

If you haven't upgraded to macOS Catalina, you can still open and use the app, but you should check with the app developer for a 64-bit version that also works with the latest macOS.

How to find 32-bit apps on your Mac

System Information can find 32-bit apps that are installed on your Mac:

1. Choose Apple menu  > About This Mac, then click the System Report button.
2. Select Legacy Software in the sidebar. All legacy software is 32-bit.
3. If you don't see Legacy Software in the sidebar, select Applications in the sidebar, then check the list of apps on the right. The column labeled ”64-Bit (Intel)” shows ”No” for apps that are 32-bit.

When upgrading to macOS Catalina, the installer shows a list of recently used apps that are 32-bit. You can review this list before choosing whether to cancel or continue the installation:

macOS Catalina also shows a prohibitory symbol over the icon of each 32-bit app in the Finder, letting you know that the app will not open.

How to contact the app developer

The developer (or vendor) is the person or company that made the app. The easiest way to find contact information for an app's developer is to search the web for their name or the name of their app. Learn more about contacting third-party vendors.

To find the name of the developer:

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1. Select the app in the Finder.
2. Choose File > Get Info from the menu bar.
3. Look for copyright information in the Info window. For example, Apple is the developer of this app:

By Malcolm Owen
Monday, June 17, 2019, 06:37 am PT (09:37 am ET)

Game publisher Aspyr is ceasing sale of its 32-bit Mac game catalog on Tuesday, with Monday being the last day the company is offering the titles for purchase, citing Apple's shift of macOS to 64-bit and end of support for 32-bit as the reason for the change.

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'Civilization IV,' a previous version from the series, is one of the 32-bit games Aspyr will cease selling as of Tuesday
Apple has warned for some time that it was discontinuing support for 32-bit applications in macOS, with the recently-revealed macOS Catalina 10.15 being the first version of the operating system to work with just 64-bit apps. High Sierra was the last to support 32-bit apps fully, while the current macOS Mojave will be the last to support 32-bit applications at all.
Due to the change, Aspyr has confirmed it too is ending support for 32-bit applications for future operating systems. From Tuesday onwards, Aspyr's remaining 32-bit Mac library will become 64-bit or receive a 64-bit update by September, in time for macOS Catalina's public release.
'Once Apple announced it was discontinuing support for 32-bit titles, we decided ending sales for those games was the right thing to do, and well before Apple's support ends later this year,' said Aspyr vice president of publishing Elizabeth Howard. 'Giving players fun, innovative games across all platforms is our focus, and we have some exciting new projects that we will reveal very soon.'
The company has published a complete list of 32-bit games that will be removed in its support pages. Its complete game library is 190 games in size, with many already 64-bit compatible or will be in the future.

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The lis of games being removed includes 'Borderlands: The Pre-Sequel,' five 'Call of Duty' titles, 'Civilization IV' and 'Colonization,' 'Duke Nukem Forever,' four 'Star Wars' games, and a selection of others.

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Aspyr advises players can continue to enjoy the 32-bit titles if they don't upgrade to macOS Catalina, while those who use Steam can take advantage of SteamPlay to play their games on other platforms that do support 32-bit software.