Apple said at the meetings of the WWDC 17 Developers Conference, which will run until June 9, that macOS will stop supporting written applications for 32-bit processors.
Beginning in January 2018, Apple will not accept any written application of that architecture, so if the developer wants to deploy it to the store, the developer needs to update it to a 64-bit architecture.
The second step will begin in June 2018, since Apple’s next operating system after MacOS High Sierra will never be able to run legacy applications. Apple will also reject any updates to legacy applications as long as they do not support 64-bit architecture.
Apple has done the same for iOS, and for several years has been asking developers not to send applications that do not support 64-bit architecture. To later reject any new application that does not support that architecture. By the end of 2016, it had removed a wide range of applications whose developers did not respond to company messages.
With the launch of iOS 11, the company completely stopped supporting and running 32-bit written applications. When attempting to run any application, a message will appear telling the user that the application needs to be updated. It has also removed these apps and prevented them from appearing in search results within the App Store.
Apple has launched the first beta versions of its new operating systems unveiled at the Developers Conference; iOS 11, MacOS 10.13, TVOS 11, and WatchOS 4.