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Apple has begun notifying macOS users of coming 32-bit app incompatibility
12 April 2018, 09:21 | Justin Tyler
You can see which processor is in your Mac from the About window in macOS
Apple began the transition to 64-bit hardware and software technology for Mac over a decade ago, and is working with developers to transition their apps to 64-bit.
Apple has already begun rejecting 32-bit apps submitted to the Mac App Store.
Starting today, April 12 macOS users will receive notifications carrying info that 32-bit apps will not be supported the operating system's future version. It told developers that macOS High Sierra would be the latest iteration of macOS to have support for 32-bit apps "without compromises".
Apple is ostensibly hoping that by warning its users, it will prompt developers that know they have 32-bit apps running on Macs to update them and deliver 64-bit integration. On the other hand, pressing OK will close the alert box and launch the app normally because the current macOS version still has support for 32-bit apps.
Users on macOS High Sierra 10.13.4 will see a one-time warning when they open apps that run on 32-bit technology.
Despite that, a fair few apps for macOS still do not have 64-bit versions. 64-bit apps are also capable of utilizing more memory than 32-bit ones, meaning they are able to perform faster, and much more smoothly. "No" means the app is 32-bit and needs to be updated, while "Yes" means it is 64-bit and will work just fine without further action from the developer. To ensure that the apps you purchase are as advanced as the Mac you run them on, all future Mac software will eventually be required to be 64-bit.
Navigate to Software/Applications in the left sidebar, then sort the list by "64-Bit (Intel)". 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. If this listing says Yes, then the app is a 64-bit app. Presently, the App Store does not accept submissions of 32-bit apps for macOS.
Nevertheless, one thing is sure, that Apple is serious about phasing out the 32-bit apps soon. The company introduced Power Mac G5, the PC with 64-bit PowerPC processors, about 15 years back. For the next four years after the A7 chip, the company encouraged developers to move to 64-bit.
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).
Making the shift on the desktop is much more cumbersome than on the mobile devices for two reasons, according to TechCrunch.
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