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Mac users who have experienced the issue this update addresses could typically only boot OS X by using Safe Mode, as a regular boot would cause the system to hang on startup. It is recommended to back up a Mac before installing any system software updates, even if it’s a small one like this. The update download is very small, weighing in around 1.2MB, and requires a restart to complete installation. “The OS X Yosemite 10.10.3 Supplemental Update fixes a video driver issue that may prevent your Mac from starting up when running certain apps that capture video.” Release notes accompanying the Supplemental Update are brief: Users can also choose to download the standalone installer from Apple here. Users can find the package available on the Mac App Store, accessible from the  Apple menu > App Store > Updates tab, the update is labeled as “OS X Yosemite 10.10.3 Supplemental Update 10.10.3”. The update is available for all OS X Yosemite users who have installed OS X 10.10.3, and it’s recommended even if you do not use video capture software on the Mac.