While macOS 10.15 Catalina won’t support old 32-bit apps, you can keep them running indefinitely on your Mac by installing a copy of 10.14 Mojave in a Parallels Desktop virtual machine.

If you have the latest version of Apple's MacOS software downloaded, you'll get a warning when you open older apps that run on 32-bit technology.

Apple has been pushing developers to move their software to 64-bit since mid-2017. Now, it's warning end users that it plans to bar 32-bit apps from running on the macOS desktop in 2019. Here's ...