4 alert signals end of 32-bit app support

Apple pushing 32-bit app warning live for macOS 10.13.4 as 64-bit transition continues

As Apple says on a support page, "you may continue to use 32-bit apps with your Mac today".

Apple is now pushing out notifications warning users that 32-bit app support will be dropped in an upcoming version of macOS. A one-time alert has been pushed out to those running macOS 10.13.4 which will trigger once users launch a 32-bit app.

"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 said in a statement on its support page Wednesday. Specifically, you'll probably still be able to run 32-bit apps - but they might not work as expected.

If you're interested in going through your Applications folder and checking each app to see if it's 32- or 64-bit, here's how. It told developers that macOS High Sierra would be the latest iteration of macOS to have support for 32-bit apps "without compromises". Make sure future releases of your app are 64-bit compatible by using new diagnostic tools in Xcode 9.3 beta and testing on macOS 10.13.4 beta. However, it is believed that the 32-bit apps won't work as well as they use to before.

Apple warned developers back in June that a future update to macOS after the current High Sierra update would not run 32-bit apps "without compromise", and 64-bit has been required for both app submissions and app updates to the Mac App Store since January 1.

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Apple's intended transition from 32-bit to 64-bit is natural as 64-bit apps are more efficient in most cases. For this, one needs to go to the Apple menu and select This Mac, and then click the System Report button. From the system report, scroll down to Software, then select Applications. Clicking on the former will load a support document that details the long process of shifting from 32-bit to 64-bit computing.

In the field that says 64-bit (Intel), check to see if it says Yes or No. The A7 chip, which powered the 2013 iPhone 5S, was the first 64-bit mobile processor.

Apple iOS users who still have 32-bit apps, get a pop-up when they tap that app's icon.

What it isn't doing, however, is telling anyone when the 32-bit/64-bit split will actually arrive. Further, the company no longer accepts 32-bit apps into the Mac App Store.

"This application is not optimized for your Mac", says the warning.

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