Users on macOS High Sierra 10.13.4 will see a one-time warning when they open old and in some cases new apps if they run on 32-bit technology. Last summer, the company was users that 32-bit apps would be disabled in a post-High Sierra update. Apple chose to ditch support for 32-bit devices with iOS 11 and it promised to make a similar move for Mac apps as well. 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.
Apple's transition from 32-bit to 64-bit technology on the Mac has been in the works for a while but so far users haven't really been affected. At the time, the tech giant confirmed that macOS High Sierra would be the last operating system to run 32-bit apps. At our Worldwide Developers Conference in 2017, Apple informed developers that macOS High Sierra would be the last version of macOS to run 32-bit apps without compromise. So how to you tell if your Mac has a 32-bit or 64-bit processor?
Apple is killing off macOS support for 32-bit apps later this year.
Start by navigating to the Apple logo in the top-left corner of the screen, clicking on it, and selecting "About This Mac".
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In June, Apple will require all Mac App Store apps to support 64-bit.
If you have a favorite app that hasn't been updated in a while, it might be worth contacting the developer to see if they're planning on issuing an update. Then scroll down to Software and select Applications.
Companies are actively trying to push developers and users towards 64-bit apps as this has more or less become the standard now for both mobile and computing devices.
In the field that says 64-bit (Intel), check to see if it says Yes or No. "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. If an app shows "No", that means it's 32-bit and needs to be updated. Finally in iOS 11 it dropped support for 32-bit apps. "Yes" indicates 64-bit; "No" indicates 32-bit.