If your Mac doesn't support macOS Catalina, it might be supported by macOS High Sierra, which requires a Mac introduced in 2009 or 2010. The latest version of macOS, macOS Catalina, is supported on any Mac introduced in 2012 or newer. Check what version of OS X or macOS your Mac supports.Be careful downloading update files from other sources.You can download macOS Catalina 10.15.3 here: Get macOS CatalinaYou can download macOS High Sierra 10.13.6 here: Get macOS High SierraYou can download OS X El Capitan 10.11.6 here: Download OS X El CapitanYou can learn more about how to upgrade to macOS Catalina here: How to upgrade to macOS Catalina - Apple SupportThe model and year of your Mac will determine which macOS you can upgrade to,Your 2014 MacBook Air can upgrade to all these below read the following links.How to upgrade to macOS Mojave - Apple SupportHow to upgrade to macOS High Sierra - Apple SupportHow to upgrade to OS X El Capitan - Apple SupportBefore upgrading make a full back up of your Mac.Check that third party apps you use have updates available for the new OS.Check that your printers/ scanners etc have updated drivers and software available for the new OS.If you are considering upgrading to Catalina be warned that it does not support 32bit apps.Your Mac is probably running 32bit apps and these will need to be updated to 64bit apps,Some updates may be free, some may be paid. The Mac App Store is the best, and usually only, place to download macOS updates. Download the update from the App Store. Many Improvements from 10.10.On real hardware, these versions have very limited hard drive controller, video, and sound support. Use the DMG for Flash drive installation and use ISO for DVD Installation or Installing on a Virtual Machines.Once the list has been created you can thenContact the developers of the apps to see if they provide 64bit updates.
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