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To make a windows bootable USB you need windows.

Doing dd (or cp) will make a device that boots the installer but ultimately will fail to install.

it's possible, just not straightforward this worked for me a few days ago https://nixaid.com/bootable-usb-windows-linux/

WoeUSB-ng worked last time I needed a Windows install USB: https://github.com/WoeUSB/WoeUSB-ng

Cool, I will soon need to replace my hard drive, I can give it a try.