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.