Apple's intended transition from 32-bit to 64-bit is natural as 64-bit apps are more efficient in most cases.
With the recent release of macOS High Sierra 10.13.4, the first time users launch an app that does not support 64-bit they will see an alert that the app is not optimized for their Mac. This gives them time to prepare accordingly, though 32-bit apps will continue to run and function properly for the time being. The company's desire to banish 32-bit software and move everyone to modern, 64-bit versions is no secret and now it is starting the process of encouraging people to make the switch.
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. In January, Apple mandated that all new apps submitted for review should be 64-bit compatible.
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. Furthermore, it stopped accepting 32-bit apps to the App Store. Like, the 64-bit architecture enables taking advantage of more memory than its 32-bit counterpart.
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Apple hasn't announced a cut-off date for 32-bit apps but High Sierra will be the last version of macOS to support the 32-bit apps "without compromise". Under "Software" in the sidebar, look for "Applications", then sort the list by "64-bit (Intel)". If you don't update, the app will not run in a future version of macOS. Even so, it's not likely Apple will immediately cut off support willy-nilly. It will also support universal apps or apps that will work across Mac and iOS devices, according to MacRumors. But for those who have been using Macs for years, download software from outside the Mac App Store, or perhaps have built their own apps, there's a chance that at least some of the programs on their computers are running in 32-bit. "This app needs to be updated by its developer to improve compatibility".
Apple has made clear for years now that its future fits squarely in the 64-bit realm.
Keep following us to get the next update from Apple on this matter. Though the company hasn't been equally aggressive with the Mac users yet, given the warnings have already started it, won't be long before 32-bit takes its last breath on the Mac's as well. First, the Apple desktop OS has been around longer than the iOS.