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To upgrade to Sierra from, say, Mavericks, you’ll have to consequently Yosemite and then to El Capitan, first.

if you’re running an OS version like Lion (OS X 10.7), you’re looking into a lot of upgrading before getting Sierra.Download: Mac OS X Snow Leopard 10.6 ISO and DMG file. It is the first operating system that has open-source BSD to be certified as fully UNIX cooperative. This version is preceded by Mac OS X 10.4 Tiger and succeeded by Mac OS X snow leopard. The latest released is 10.5.8 (Build 9元1a) on August 13, 2009.The Yosemite 10.10.5 is the brilliant and a powerful Mac OS X update and improves the. Mac OS X Yosemite 10.10.5 for Mac free DMG Image offline Setup.No matter which way you choose, always remember to back up your data before performing an upgrade. There are two ways to upgrade macOS: directly in Mac App Store, or upgrade using an USB device. If you are running OS X Lion (10.7.5) or later, you can upgrade directly to macOS High Sierra.if you’re running an OS version like Lion (OS X 10.7), you’re looking into a lot of upgrading before getting Sierra. How to reinstall Mac OS X 10.7 or OS X 10.8. How to UPGRADE your mac from Os X Lion to High Sierra. How to UPGRADE - Mac - Os - X 10.7.5 to High Sierra Blue Kap. The Yosemite 10.10.5 is the brilliant and a powerful Mac OS X update and improves the stability, compatibility, and security of your Mac.