If you’re running MacOS 10.13.4 you'll start see an alert box when you open a 32-bit app. The 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. Apple has already completed the transition with iOS, but doing the same on desktop is likely to be more complicated, mainly because it's been around for longer. Thoughts ?