These download to your Applications folder as an app named Install macOS. Download: macOS Big Sur, macOS Catalina, macOS Mojave, or macOS High Sierra.A downloaded installer for macOS Big Sur, Catalina, Mojave, High Sierra, or El Capitan.A USB flash drive or other secondary volume formatted as Mac OS Extended, with at least 14GB of available storage.Mac OS users who want to install OS X 10.10 Yosemite on their machines and are facing issues installing the operating system for the first time on their Macs can follow a simple step-by-step guide. I recommend making one for Yosemite, on an external hard drive or USB thumb drive, for many of the same reasons I recommend making a bootable Mavericks installer drive: If you want to install. The best thing to do is download it once and create a bootable install USB drive from the file for all of your Macs.
Apple released the new Mac OS X 10.10 Yosemite in the Mac App Store for everyone to download and install for free on October 16th, 2014, but downloading a 5+ GB file for each of your computers will take some serious time. So, Apple continues to give you the option of creating a bootable USB drive. There are times when you may want to avoid using App Store or the built-in recovery mode to install OS X 10.10 Yosemite. So you have to quit the installer once it appears in order to keep this file. After you upgrade to Yosemite, this file is deleted. The 5GB OS X Yosemite installer app that downloads into your Applications folder when you first install it via the Mac App Store. What you need to create a bootable installer You don't need a bootable installer to upgrade macOS or reinstall macOS, but it can be useful when you want to install on multiple computers without downloading the installer each time.
These advanced steps are primarily for system administrators and others who are familiar with the command line.
Macos Yosemite Usb Installer Windows 10.