Menu
Check compatibility
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.
OS X Yosemite Simulator by matei-bratu; OS X Yosemite Simulator by sardiniangale; OS X Yosemite Simulator TV Version by ibradley2334; OS X Yosemite Simulator remix by ellistomas; Mac OS X Sierra (10.12.0) by -Apple-Inc; Mac OS X 10.7 by PigVenomPV; OS X Yosemite X Kirby Simulator by honnybean; Mac OS Simulator by ownh; What a mac does.
MacBook introduced in 2009 or later, plus MacBook (13-inch, Aluminum, Late 2008)
MacBook Air introduced in late 2008 or later
MacBook Pro introduced in mid 2007 or later
Mac mini introduced in early 2009 or later
iMac introduced in mid 2007 or later
Mac Pro introduced in early 2008 or later
Xserve models introduced in early 2009
MacBook Air introduced in late 2008 or later
MacBook Pro introduced in mid 2007 or later
Mac mini introduced in early 2009 or later
iMac introduced in mid 2007 or later
Mac Pro introduced in early 2008 or later
Xserve 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.
![Boot Boot](/uploads/1/2/6/8/126883552/737905639.png)
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.
Follow the onscreen instructions, which will guide you through the steps necessary to install.
Begin 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.
Learn more
- 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.
Last week’s update to Mac OS X 10.10.3 Yosemite featured a number of new features, bug fixes, and performance enhancements. For example, the update brought the new Photos app to all users, a precursor to the eventual elimination of both iPhoto and Aperture from the Apple software stable. It also resolved some longstanding 10.10 issues with Wi-Fi networks, Bluetooth connectivity, and Safari, and also added over 300 new Emoji characters. Two of the less unsung updates will have a positive effect on the performance of some SSD-equipped Macs as well as those that are connected to 4K (and higher resolution) displays.
The first of these two updates should be useful with anyone who uses PCI Express SSDs, including those built into newer Mac models. Apple has built in new support for the NVM Express SSD Interface (also known as NVMe) in 10.10.3. It’s an optimized PCIe-based protocol that should provide faster SSD performance than is possible with current AHCI (Advanced Host Controller Interface) implementations.
NVMe was designed by an industry consortium and is meant to replace AHCI technology, which was designed to optimize performance in traditional spinning hard disk drives. NVMe, on the other hand, is optimized for lower latency operations provided by solid state media, reducing latency by a full 50 percent. NVMe is designed to scale over the next ten years, giving it a lifecycle similar to that of AHCI, which has been around since 2004. Apple uses the PCIe transport protocol on all Macs built since 2011, so the company can quickly roll out support for NVMe across the full line of desktop and laptop machines.
What’s the first Mac to benefit from NVMe speed and power efficiency? The new 12-inch MacBook with Retina Display. That little machine is expected to start arriving in the hands of Mac users this week after an official introduction last Friday and will also take advantage of another 10.10.3 feature: enhanced 4K support.
Apple used to support only certain Multi-Stream Transport (MST) displays at a refresh rate of 60Hz, but now says that “most single-stream 4K (3840 x 2160) displays” are supported at 60 Hz under OS X 10.10.3. What does this mean for Mac owners? The ability to purchase and use less expensive 4K displays that don’t include DisplayPort’s MST feature.
Download Os X Yosemite
The Macs that will support the Single-Stream (SST) displays include:
Mac Os Yosemite Iso Download
- MacBook Pro (Retina, 13-inch, Early 2015)
- MacBook Pro (Retina, 15-inch, Mid 2014)
- Mac Pro (Late 2013)
- iMac (27-inch, Late 2013 and later)
- Mac mini (Late 2014)
- MacBook Air (Early 2015)
- MacBook (Retina, 12-inch, Early 2015)
Mac Os Yosemite
The new MacBook will support displays at 3840 x 2160 at 30 Hz or 4096 x 2160 at 24 Hz over HDMI. Of course, since the new device only has a single USB-C port, owners will need the appropriate adapter to connect to the higher resolution monitors while still providing power to the laptop.