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Apple Insider reports that Apple's macOS will begin to display alert boxes when a 32-bit app is opened, warning users that the operating system will soon end support for the legacy technology.



According to Apple, warning messages like the one above will appear in macOS 10.13.4, the latest Mac operating system version that saw release last month. The alert pops up once per app and serves as notification of Apple's pending transition to 64-bit technology.

Clicking on "Learn More" takes users to a support document detailing the long process of shifting away from 32-bit to the more efficient 64-bit. As noted by Apple, 64-bit apps are able to access more memory and harness the power of newer technologies like Metal graphics acceleration.
  New macOS alert notifies users Apple will soon end 32-bit app support