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Downgrade from Sierra to Mountain Lion on IMac

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Joined
Jan 12, 2017
Messages
1
Motherboard
Noctuno
CPU
Intel
Graphics
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
 
Joined
Mar 10, 2016
Messages
967
Motherboard
Asus Z-87 Pro WLAN
CPU
i7-4770K
Graphics
HD 4600 // GTX 980
Mac
  1. MacBook Air
Mobile Phone
  1. iOS
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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