macOS X Yosemite (version 10.10) is the eleventh major release of Apple’s desktop operating system, originally launched in October 2014. The final point‑release update, , was published in August 2015 and includes security patches, bug fixes, and minor feature refinements. Although newer macOS versions are now available, some users and organizations continue to run Yosemite for compatibility with legacy software or hardware.
What you get: InstallMacOSX.dmg (approx 5.2 GB). That DMG contains the Install OS X Yosemite.app . This is the (14F27 for standard, 14F2511 for security-updated version).
Before downloading, ensure your Mac qualifies: