With iTunes gone, bogdanw made both iTunes 12.6.5, which supports the App Store, and iTunes 12.9.5, the last version of iTunes for macOS, run on macOS Catalina.

After Firefox deprecated support for OS X 10.8 and below, Ethan Nelson-Moore ported Firefox Quantum to work with Mac OS X Lion and OS X Mountain Lion.When CoverFlow was taken out of Finder in macOS Mojave, photographer Andrew Marcus was able to run Finder from macOS High Sierra in macOS Mojave.Foxlet shoehorned Notification Center from OS X El Capitan to run on macOS Sierra.Daniel Jalkut did the reverse, making Xcode 6 run on macOS Sierra. Two years later, macOS Sierra dropped support for Xcode 6.Landon Fuller made Xcode 6.2 and Xcode 6.3 able to run on OS X Mavericks. In the same year, when Xcode 6.2 dropped support for OS X Mavericks.His technique kept working all the way till macOS High Sierra. Justus Beyer ported Disk Utility from OS X Yosemite to OS X El Capitan.GoAtReasonableSpeeds made several iOS 6 system apps work on iOS 7, and later, in iOS 8, too.Mahler made AirPort Utility v5.6.1 run on OS X Mavericks. After CoverFlow was removed in iTunes 11, Negritude installed iTunes 10.7 on OS X Mavericks.Der Flounder later perfected his technique. John Fair went with the extreme option, making Mac OS X Snow Leopard run on devices that only shipped with OS X Lion.Mike Potter made Preview and TextEdit from Snow Leopard work on OS X Lion.

Ralph Perdomo modified Front Row to run on OS X Lion.

It’s no news that the brave and the reckless have been able to monkey-patch or shoehorn macOS into running apps under completely unsupported configurations.

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