Reminder: 64-bit Requirement for Mac Apps
January 24, 2018
Starting January 31, new apps submitted to the Mac App Store must support 64-bit, and Mac app updates and existing apps must support 64-bit starting June 2018. If you distribute your apps outside the Mac App Store, we highly recommend distributing 64-bit binaries to make sure your users can continue to run your apps on future versions of macOS. Build and submit your apps using Xcode 9.2.