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
As of September 25, 2017, macOS 10.13 High Sierra is publicly available for all Mac users to install. Office 2016 for Mac is fully supported on High Sierra. For the best experience, we recommend you update Office to version 15.38 or later. For updates regarding macOS 10.14 Mojave, see Microsoft Office support for macOS 10.14 Mojave. Photo Credit: Apple, Inc. (macOS High Sierra on MacBook Pro) macOS High Sierra is a free release and the final version only will be available officially via Apple's own App Store. New macOS High Sierra Features. Long-term Mac users can guess that macOS High Sierra (10.13) is a refinement of macOS Sierra (10.12) because of the naming structure. IMPORTANT: This article applies only to specific products and/or operating systems. Check Applicable Products and Categories for details. Choose your camera type to see the list of models compatible with macOS™ 10.13 High Sierra.
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
https://powerfullabs.weebly.com/updating-command-line-tools-macos-sierra-version-1012-for-xcode.html. System Information can find 32-bit apps that are installed on your Mac:
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https://powerfullabs.weebly.com/os-x-stand-for.html. 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:
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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. Mame for mac os x yosemite. 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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