To safely obtain Yosemite 10.10.5 without risking malware from third-party "warez" sites:
Apple provides the full installer for Yosemite as a disk image (.dmg) file for users with older, compatible Macs. mac os x yosemite 1010 5 download dmg link
. Note that this link often downloads the base version (10.10), which then requires an update to 10.10.5. Combo Update (10.10.5): To safely obtain Yosemite 10
| Minimum Hardware | Supported Models | |------------------|------------------| | | 64‑bit Intel Core 2 Duo or later | | RAM | 2 GB (4 GB+ recommended for smoother performance) | | Free Disk Space | At least 8 GB of available storage for the installer; additional space required for the OS and apps | | Graphics | Metal‑compatible GPU (required for some UI effects) | | Supported Macs | • iMac (Late 2009 or newer) • MacBook (Late 2008 Aluminum, Early 2009 or newer) • MacBook Air (Late 2010 or newer) • MacBook Pro (Mid 2009 or newer) • Mac mini (Mid‑2010 or newer) • Mac Pro (Early 2009 or newer) • Xserve (Early 2009) | Combo Update (10
If you need a portable installer (e.g., to install Yosemite on multiple machines), you can transform the official into a bootable medium.