![]() Prepare your Mac for the installation, if necessary.Use your installation disc or drive to boot up your Mac.Find and download a macOS installer file for the version you want to install (sometimes this is a.Check your Mac meets the system requirements to run older OS X versions.To install an older version of OS X on Mac, you need to: ![]() In situations like these, installing an old version of the operating system may be your best choice. Or you might have old software that can’t be run on newer OS X versions like Catalina or Big Sur. Older Macs often run better with earlier versions of macOS, for example. And eventually, Apple stops supporting older editions of macOS - and that means no more security patches.īut there are some good reasons to do it anyway. After all, newer versions of the operating system have more features. Standalone updates can be useful if you want to install the same update again or on another computer.On the face of it, running old versions of macOS on your Mac seems counterproductive. You can also get this update from the Apple Support Downloads site.You might have unexpected results if third-party OS X modifications have been installed, or you modified OS X through other means.Don't interrupt the installation process after it has begun.Some updates become available only after installing another update. Use the Mac App Store to install this update and other available updates.You can back up with Time Machine, for example. You should back up your Mac before installation.Fixes an issue in QuickTime Player that prevented playback of Windows Media filesįor detailed information about the security content of this update, see Apple security updates.Fixes an issue in Photos that prevented importing videos from GoPro cameras.Improves compatibility with certain email servers when using Mail. ![]() The OS X Yosemite 10.10.5 update improves the stability, compatibility, and security of your Mac, and is recommended for all users. ![]() The OS X Yosemite v10.10.5 Update is recommended for all OS X Yosemite users. ![]()
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