And until then, there's a chance that the 32-bit apps will not work as well as their 64-bit counterparts as Apple optimizes its operating system updates for 64-bit processing.
Apple is making the transition to 64-bit in part because it will be easier to maintain, and also because 64-bit apps are more efficient in most cases. It is possible that the next version of macOS will retain some limited compatibility with 32-bit apps. "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", Apple said.
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The alerts appear only when a 32-bit app launches, and will have a Learn More button that takes users to an Apple KnowledgeBase article that explains the transition. 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. The message states that the app is "not optimized" for macOS, but will continue working for the time being. Still, when the big day finally rolls around, there will nearly certainly be complaints nonetheless.
macOS has been 64-bit for years, but also supports 32-bit apps. It no longer accepts 32-bit apps for listing on the Mac App Store so it may not be long before it hammers in the final nail. Now, Apple is warning 32-bit macOS app users that the versions of the software they're relying on don't have long for this world. "The developer of this app needs to update it to improve its compatibility." . The tech giant has been transitioning to the 64-bit hardware and software since last decade or so. Developers might still have a few months to work on their apps and transition into 64-bit, if they haven't already.
Start by navigating to the Apple logo in the top-left corner of the screen, clicking on it, and selecting "About This Mac". Under "Software" in the sidebar, look for "Applications", then sort the list by "64-bit (Intel)". Presently, the App Store does not accept submissions of 32-bit apps for macOS. "Yes" indicates 64-bit; "No" indicates 32-bit", the page reads. The A7 chip, which powered the 2013 iPhone 5S, was the first 64-bit mobile processor.