I'm trying to apply an individual BIOS update to many servers. In the old days, I'd use Rufus to make a USB stick bootable, copy the BIOS update file to it, walk to the server room, plug it in, boot ...

Microsoft wants you to have a free Windows 10 upgrade, and they really want you to use Windows Update to get it over the Internet. If you have a PC that qualifies for the upgrade, you should do this ...