You may have noticed an alert on your Mac that looks like this:
Since macOS High Sierra 10.13.4, Apple has produced a one-time alert when a 32-bit application is launched. So, as we inch closer to Apple’s release of macOS Catalina, it’s time to track down all these apps and start to take action.
You can use the built-in System Information.app to quickly identify any 32-bit applications that are installed on your Mac. First, navigate to /Applications/Utilities/System Information.app. In the left-hand column, under Software click on Applications. On the top at the right, you’ll see 64-bit (Intel) where you can sort the column ascending/descending. “Yes” indicates 64-bit support; “No” indicates 32-bit. learn more
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