Apple already needs new applicatis submitted to the Mac App Store to provide 64-bit support, a change that came into effect in January 2018. This upcoming policy change will therefore ly affect older apps that do not have access. have not yet implemented the 64-bit support.
With the warning to developers, Apple says that customers running the latest macOS 10.13.4 update will begin to receive warning messages when they launch a 32-bit applicati for the first time to let them know that the app is not optimized for their Mac. According to TechCrunch these warnings will begin at midnight Pacific Time April 12.
With the recent release of macOS High Sierra 10.13.4, users launch for the first time an applicati that does not support 64- little they will see an alert that the applicati is not optimized for their Mac.
As a reminder, new applicatis submitted to the Mac …