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. The company has now started informing Mac users that 32-bit app support is going to end in the near future.
"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", says the support page. The warning suggests that the future version of the macOS won't support 32-bit apps, according to Ars Technica. 64-bit apps are also capable of utilizing more memory than 32-bit ones, meaning they are able to perform faster, and much more smoothly.
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. There could be one on the developer's website, or in Apple's App Store.
Users of 32-bit applications on the MacOS platform could be left high and dry after Apple warned that support would be disabled in a forthcoming update. The steps, which will take some time, require that you get into your System Report pane and look to see whether apps support 64-bit.
For now, it can be assumed that the 32-bit apps will run for the Mac users. One of the items is 64-bit (Intel). They can also potentially handle processor requests more efficiently than their 32-bit counterparts.
Apple is making it clear that 32-bit apps on the Mac are going away and the future will be 64-bit only. Even so, it's not likely Apple will immediately cut off support willy-nilly.
For now, the iPhone maker is just giving out warnings, and it has given no specific dates when the OS will totally stop supporting the 32-bit apps. The pop-up says that the app needs to be updated.
Despite that, a fair few apps for macOS still do not have 64-bit versions. If you do not have version 10.13.4 installed, you will not see the alerts, but they will appear once you update your Mac. 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.