Windows 7 was available as a ISO file when Windows 8 hadn't been released yet, but now, you can only get Windows 8 in a ISO file, and the problem is that Windows 8 isn't compatible with Boot Camp.
Another method to install Windows if your Mac hasn't got a SuperDrive is to buy an external optical drive and install Windows from a DVD. You can still buy Windows 7 in Amazon, if you haven't got it yet
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