From what I understand from the following article is that the Boot Camp Driver is for booting Windows on a Mac and not for creating a stand alone install USB.
The reason it won't load onto a Windows machine is because it incorporates Mac drivers for the machine it was created on.
https://twocanoes.com/create-a-windows-10-bootable-usb-flash-drive-on-a-mac/If your father's machine has a DVD drive then if you PM me your address I can send you a couple of Win 10 Home x 64 1809 install disks - I assume the machine is a 64bit one ?
If not, then I can create the 32bit versions from the MCT.
I've noticed from your IP address that you are in the USA although the MCT also gives you a choice of languages.