Check compatibility
OS X can search the Mac App Store to find the app that can open the file. Buy what you need instantly and get back to business. Buy, download and even re-download. You can install apps on every Mac authorised for your personal use, and even download them again. XCODE allows developers to release apps that span support for users seemlessly on app store. Once released (if a user doesn't upgrade their device), their device never stops being able to run the app software. The developer can release for many apple platforms at once. They are not 'guessing game' support each apple device is directly supported.
You can upgrade to OS Yosemite on any of the following Mac models. Your Mac also needs at least 2GB of memory and 8GB of available storage space.
MacBook introduced in 2009 or later, plus MacBook (13-inch, Aluminum, Late 2008)MacBook Air introduced in late 2008 or laterMacBook Pro introduced in mid 2007 or laterMac mini introduced in early 2009 or lateriMac introduced in mid 2007 or laterMac Pro introduced in early 2008 or laterXserve models introduced in early 2009
To find your Mac model, memory, storage space, and macOS version, choose About This Mac from the Apple menu . If your Mac isn't compatible with OS X Yosemite, the installer will let you know.Make a backup
Before installing any upgrade, it’s a good idea to back up your Mac. Time Machine makes it simple, and other backup methods are also available. Learn how to back up your Mac.Get connected
It takes time to download and install OS X, so make sure that you have a reliable Internet connection. If you're using a Mac notebook computer, plug it into AC power. Download OS X Yosemite
For the strongest security and latest features, find out whether you can upgrade to macOS Catalina, the latest version of macOS.
If you still need OS X Yosemite, use this link: Download OS X Yosemite. A file named InstallMacOSX.dmg will download to your Mac.Install the macOS installer
Double-click the downloaded file to open a window showing its contents. Then double-click the file within, named InstallMacOSX.pkg.Windows Store App Installer
Follow the onscreen instructions, which will guide you through the steps necessary to install.App Installer StoreBegin installation
After installation of the installer is complete, open the Applications folder on your Mac, then double-click the file named Install OS X Yosemite.
Click Continue and follow the onscreen instructions. You might find it easiest to begin installation in the evening so that it can complete overnight, if needed. Allow installation to complete
Please allow installation to complete without putting your Mac to sleep or closing its lid. Your Mac might restart, show a progress bar, or show a blank screen several times as it installs both OS X and related updates to your Mac firmware.Mac App Store Os X 10.10 Yosemite InstallerLearn moreMac Os X Installer Apple Store
*OS X Yosemite won't install on top of a later version of macOS, but you can erase your disk first or install on another disk.
*You can use macOS Recovery to reinstall macOS.
