Houston Chronicle by Dwight Silverman July 12, 2019
Like clockwork, Apple churns out each fall a new version of the software that powers its Macintosh computers, touting cool and useful new things it can do.
This year, the updated operating system is notable for what it won’t do.
The new release, called macOS 10.15 Catalina, may prove fatal for some of your favorite Mac apps. That’s because Catalina will only work with programs that are written using 64-bit code. Many programs - including some created by Apple itself — are crafted using older, 32-bit code. Those older apps will stop working once you install the next version of macOS on your Apple desktop or laptop.
And you have been warned this was coming. For a couple of years now, launching a 32-bit app on a Mac that’s been updated generates a message that says the app is not “optimized†and that it “will not work with future versions of macOSâ€. If you downloaded and installed the beta version of Catalina made available last month, you're already feeling the pain.
Welcome to the 32-bitpocalypse, which is expected to hit in September when Apple traditionally releases its latest software. If you’ve been clinging to older versions of programs, or if an older app you rely on just hasn’t been updated, you’ve got some tough choices to make.
Possibly more concerning is that some of the files you created with older programs may no longer be usable, particularly video recorded in an older format. All those early digital movies you took of your kids? Poof!
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https://www.houstonchronicle.com/techburger/article/Some-of-your-favorite-Mac-apps-will-be-casualties-14088505.php