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: Open the Applications folder and double-click Install OS X Yosemite to begin the operating system installation. System Requirements mac os x yosemite 10.10 5 download dmg
: On a Mac running macOS Catalina 10.15 or later, you can try to fetch the full installer by opening Terminal and typing: softwareupdate --fetch-full-installer --full-installer-version 10.10.5 Note: This only works if your hardware is officially compatible with Yosemite. Here’s a clean, informative post suitable for a