According to Apples reminder, starting January 1, all new apps submitted to the Mac App Store must support 64-bit architecture, while existing apps must be updated to 64-bit by June 2018. Apple recommends that if you distribute your app outside of the App Store you should update your app to run 64-bit as well. This is due to the fact that macOS High Sierra will be the last macOS release to support 32-bit architecture.
As a reminder, new apps submitted to the Mac App Store must support 64-bit starting January 2018, 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. The last macOS release to support 32-bit apps without compromise is macOS High Sierra. --64-bit Requirement for Mac Apps
Apple Will No Longer Accept 32-bit Mac Apps from January 2018
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