Starting tomorrow, you’ll see an alert box when you open a 32-bit app in MacOS 10.13.4. The one-time-per-app warning is designed to encourage users — and developers — to update their apps before Apple’s full transition to 64-bit. It’s not clear when the complete switch will happen, but when it does, all support for the legacy architecture will cease and apps that haven’t been updated will stop working…. 

https://www.engadget.com/2018/04/12/apple-mac-32-bit-app-warning/

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