How to tell if an app will run in macOS Catalina

Howard Oakley for Eclectic Light Company:If you’re intending to upgrade to Catalina, even early next year, perhaps, one of the first questions you need to ask is whether your important apps will run in macOS 10.15. In many previous macOS upgrades, this hasn’t been such an important question, and the answer has usually been far simpler. One of the problems with upgrading now is that some apps won’t just be a bit rough, but will stop working altogether when you upgrade.
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