Microsoft gained footing again with Windows 7, which was released on October 22, 2009.
This software is automatically downloaded when you use Boot Camp Assistant.
For this, you can use a utility such as Carbon Copy Cloner, but we're going to show you how to do it with Apple's own Disk Utility program.
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Windows 10 is available from Microsoft as an ISO file and a USB flash drive.
If you purchased the USB flash drive version, you can download an ISO from Microsoft and use the Windows installation key that came with your flash drive.