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What is the ‘not optimized for your Mac’ warning message?

April 12, 2018
Jonny Evans

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Mac users running the recently-released macOS 10.13.4 update may see a new alert message when they login and launch apps this morning, as Apple begins keeping its WWDC promise to push developers to upgrade their apps to 64-bit.

What is this alert?

Starting around midnight local time between 11-12 April, Macs running the latest OS version begin offering up a warning message the first time their users launched a 32-bit application.

macos high sierra 32 bit app alert Apple

32-bit app alerts are coming to macOS 10.13.4.

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