Mac Os X Yosemite 10.10 5 Download //top\\ Dmg

Prepare the USB drive (will be erased):

If you previously downloaded Yosemite using your Apple ID, it will appear in your Purchased history in the App Store, where you can redownload it. How to Create a Bootable USB from a DMG

Once you have successfully used your to install the OS, you must immediately take three steps to make it usable in 2026:

Finding an official, safe link for a decade-old OS can be tricky. Here are your best options: OS X Yosemite 10.10.5 App Store Downloading Guide