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If you had created a Boot Camp USB stick all the way back at the start from the High Sierra Boot Camp Assistant and youve since upgraded to Mojave or Catalina or youre running on APFS in High Sierra dont bother with that version of the Boot Camp drivers because theyre too old for the Boot Camp control panel to read your APFS disk.

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You may use this guide so that you dont have to go through the pain that I did.

The first step is to get boot screen going so you can see whats happening in the pre-boot environment assuming you are using a PC graphics cards and not a Mac flashed one.

Follow the instructions on theres a video you can watch attached to the link, its not too hard.

Thank you to the crafty hackers that came up with this, in addition to a basic text-based boot screen you get GPU-accelerated h.264 encoding support, PCIe connected drives appearing as internal, macOS Catalina support and more.

Theres a lot more you can do with OpenCore but thats out of scope of this guide.

This step is recommended but it is not required for the rest of the steps in this guide to work if you want Windows 10 but dont want to install the OpenCore boot loader for some reason.

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If you have an SSD in one of your four SATA-2 bays and youre running High Sierra and you want to install from a Windows 7 or Window 8 DVD you can install using Boot Camp Assistant that comes with High Sierra, if not, and for most of us thats not going to be good enough, its going to take a bit more work than that.

Im going to assume that you have Windows 10 on a USB flash drive either one that you created yourself or one of the official USB sticks from Microsoft.

Depending on how old your Windows 10 USB stick is (mine was from 2015) the installer is going to try to create an MBR partition for you which wont boot on Mac Pro 5,1.

I assume that if you have a newer Windows installer version it will setup an EFI NTFS partion so you wont need to do this next step.

Install either Paragon or Tuxera (neither is free but it will come in handy later on, I used Paragon.) Setup your NTFS drive partition from Disk Utility in macOS.

This could be one of your SATA-2 connected drives or it could be a PCIe connected SSD, I used the latter.

Make sure that you pick Format: Microsoft NTFS and Scheme: GUID Partition Map, not Master Boot Record or Apple Partition Map.

At this point youre ready to install Windows but unfortunately youre going to need to put your Mac-flashed video card back in (assuming you have one) because Windows 10, even modern versions of it are not going to show any kind of video for example on an RX 580 (thats what I have) on a Mac Pro 5,1.

Turn off your Mac, reinstall your Mac-flashed video card and boot up from your USB stick.

You may have to select Reset NVRAM option for the USB stick to show up.

If you didnt flash your bootloader in the first step thats ok since presumably you have a Mac firmware video card installed here and so you can hold option and boot from the USB stick that way, its just going to be harder to get back to Windows later on.

Install Windows as normal, it will copy the files, reboot, then youll get an option to run Express Setup.

Pick Custom Setup and answer No to all the privacy invasive options: No, No, No, No Next No, No, No, No, No Next.

It will reboot one more time, ask you for your Username and Password and youre done with the Windows 10 installer.

You wont get the option to boot into macOS at this point and Windows will boot automatically.

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