Double-click Setup.exe:

Feb 15, 2014 Download Apple Boot Camp Support Software for Mac to install Windows using Intel devices. Apple Boot Camp Support Software has had 0 updates within the past 6 months. Boot Camp supports 64-bit versions of Windows 10 when used with a supported Mac. It is highly recommended to always use the most recent driver version available. Try to set a system restore point before installing a device driver. I'm sure some of you have noticed that boot camp support drivers version 4.0.4033 can't be downloaded from apple anymore. Quite a few people, including me, were looking for it and many still are. A while back I dug it up from the web and posted the link in a different post and people are still coming there to download it. Boot Camp Support Software 4.0.4326 This download contains the Windows Support Software (Windows Drivers) you will need to support Windows 7 on your Mac. Mar 14, 2013 - 894.44 MB.

'Boot Camp x64 is unsupported on this computer model'

Double-click BootCamp64.msi:

'This installation requires elevated privileges. Launch the installer through setup.exe.'

Run BootCamp64.msi from an elevated command prompt:

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'This version of Boot Camp is not intended for this computer model.'

So what gives? You need to pass the NOCHECK=1 option to the MSI.

I've seen guides recommending modification of the MSI files or other old information that did not work for me.

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Open an elevated command prompt (click Start, type 'cmd', then right-click and run as Administrator), go to the the BootCampDriversApple directory, then run this:

msiexec /i BootCamp64.msi NOCHECK=1

I was able to install Boot Camp (and its drivers) under x64 Windows 7 on my 2007 Mac Pro (macpro2,1) this way.

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Note that this is not required for all versions of Boot Camp. It was needed for version 4.0.4255, but not version 4.0.4033.

If you can't run High Sierra because of hardware, you might run into the same issue with Win 10.

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Regardless, what you could do is forget traditional Boot Camp methods. Burn the Win 10 iso to DVD. Extract the Boot Camp files and either put them on a flash drive or another optical disc. Re-partition the disk. Alt Boot and choose the Win 10 disc, install. Look in Device Manager and use the extracted Boot Camp drivers to complete the hardware setup. You might find that you need a different version of Boot Camp for the correct drivers.

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That means that you will need to Alt Boot to switch between OSs, but that's what I always did with official Boot Camp setups anyway.

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If that doesn't work, a third party boot loader like rEFInd might help. http://www.rodsbooks.com/refind/