To download Mac OS X Yosemite 10.10.5, it is recommended to use official Apple sources to ensure the security and integrity of the operating system Apple Support Community Official Download Links
To download Mac OS X Yosemite 10.10.5, the most secure and official method is through Apple's support pages or the Mac App Store. Since Yosemite is an older, unsupported operating system, Apple provides direct disk image (.dmg) files for older versions through a web browser. Official Download Links Full Installer (.dmg): mac os x yosemite 1010 5 download dmg link
: The revamped Notification Center added a "Today" view with support for third-party widgets. To download Mac OS X Yosemite 10
If you're looking for a direct download link, here's one: unsupported operating system