Mac 32-bit Support Ending, Users Being Warned

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

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

Today and tomorrow, macOS users will begin seeing notifications informing them that 32-bit apps will not be supported in a future version of macOS, Apple representatives told Ars.

MacOS will start showing alerts when you run a 32-bit app on version 10.13.4 or later of the operating system, AppleInsider reported.

New apps that were to be submitted to the Mac App Store in January 2018 had to be of the 64-bit variety and developers would also have to upgrade all existing apps in the App Store to 64-bit by June 2018 if they wanted their apps to remain approved for listing.

MacOS High Sierra, the latest version of Apple's PC operating system, will be the last version to run 32-bit apps "without compromise", said Apple.

While developers optimize their apps for 64-bit compatibility, Apple is notifying customers when they are using an app based on 32-bit technology.


Apple followed a similar transition process for the iOS as well, giving alert pop-ups on 32-bit iOS apps with iOS 10.3.

Developers will have to switch from 32-bit to 64-bit if they want their apps to continue functioning when macOS 10.14 arrives.

Apple's support document also includes a new "frequently asked questions" section that addresses concerns like potential data loss and 32-bit app support on macOS High Sierra, according to the website 9to5 Mac. When you select an individual application, you will see a field titled "64-bit (Intel)". It's part of an overall move to remove 32-bit application support from the operating system at some undetermined point in the future.

How do I check if an app is 32-bit or 64-bit?

However, it is believed that the 32-bit apps won't work as well as they use to before. That update will likely come in September or October of this year, and we can probably expect further details at Apple's Worldwide Developers Conference (WWDC) in June. The bar on 32-bit iOS apps was one of the key reasons the number of iOS apps in the App Store fell past year. The company introduced Power Mac G5, the PC with 64-bit PowerPC processors, about 15 years back. Thereafter, the company made 64-bit mandatory with the iOS 11. The pop-up says that the app needs to be updated. Still, users can already check which apps they're running on their Macs need to be updated before the transition happens.

This break with compatibility for the very first version of watchOS is an indication that Apple intends to keep rushing forward with Apple Watch, and that watchOS 5 will be more than just a minor upgrade.

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