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Downgrade from Sierra to Mountain Lion on IMac

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Jan 12, 2017
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Motherboard
Noctuno
CPU
Intel
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N/A
Hello dear friends,

I need a little help, I have an old Imac with Sierra OS installed and I was trying to install Win 10. The Bootcamp does not recognize the CD or the Flash Drive or the .iso I have downloaded. I checked and it seems like I need to downgrade to Mountain Lion 10.8 or 10.9 so I can install win 7 or 8. I am new on Mac and I have been doing research but still unable to install an older version of the OS. I think if I downgrade from Sierra to Lion the bootcamp (at least) will recognize the DVD I have with the Win 8 ISO. Help please, any ideas, recommendations?

Thanks in advance
 
You can download Mountain Lion from the Mac App Store when you downloaded it once in the past. When you haven´t downloaded Mountain Lion in the past, ask a friend or someone else who downloaded Mountain Lion and create a bootable USB stick.
 
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