You can create a bootable El Capitan installer by following the guide here. Just hold option/alt down when you boot up your Mac Here’s where you can get the needed image file: How to upgrade to OS X El Capitan Was this answer helpful? Edit 2016: This is true for any OS except El Capitan - Apple are leaving it available so devices ineligible for Sierra can still obtain it. You need to already have it in your Purchase History, otherwise once it's gone from the App Store, that's it, it's gone.
Graphics card compatibility
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Supported media formats
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You can import the following video, still image, and audio formats.
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