The technologies that define today's Mac experience-such as Metal graphics acceleration-work only with 64-bit apps.
There is technically no reason for Apple to be unable to support both 32-bit and 64-bit apps at the same time. The alert is similar to the ones that appeared when Apple transitioned iOS from 32-bit to 64-bit. Apple has been making the transition to 64-bit hardware and software for more than 10 years, and the company already stopped accepting 32-bit apps into the Mac App Store.
The alerts are part of the macOS 10.13.4 update. It is believed that Apple will require developers to only build 64-bit apps starting this June. At our Worldwide Developers Conference in 2017, Apple informed developers that macOS High Sierra would be the last version of macOS to run 32-bit apps without compromise. At the time, the tech giant confirmed that macOS High Sierra would be the last operating system to run 32-bit apps. There could be one on the developer's website, or in Apple's App Store.
High Sierra continues to support 32-bit apps, but future updates are likely to either block them or change the way they work to be less powerful, to encourage upgrading. Apple usually unveils the next major versions of its operating systems at that event, so it makes sense that Apple could provide more details then. Aside from the absence of support for 32-bit apps, the new Mac operating system is said to come with performance improvements, bug fixes and new features.
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In the Finder, click on the Apple menu in the upper left and select About This Mac. The top pane is an alphabetical list of the apps on your Mac.
In the lower pane, you'll see some information about the app you selected. When you select an individual application, you will see a field titled "64-bit (Intel)".
Apple is killing off macOS support for 32-bit apps later this year. At least Apple isn't going to nag users and will only pop up the warning once for each 32-bit app.
If you're using an old Apple Watch app that hasn't been updated in a while, you might run into some problems when watchOS 5 lands (likely sometime this autumn).
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Apple has had practice at deprecating legacy applications, as the same process was used for the 32-bit apps in iOS.
"This app will not work with future versions of watchOS".
This app needs to be updated by its developer to improve compatibility.
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