Just FYI, in reality the two options with regard to not upgrading this machine now are having the MCT directly create a bootable USB drive, or downloading the ISO. If you want the ISO on optical media you have to use a burning utility to transfer the image file to DVD. That, or you can use Rufus to create a bootable USB. There is no "direct to DVD" option.
Brian - Windows 10 Home, 64-Bit, Version 1803, Build 17134
A great deal of intelligence can be invested in ignorance when the need for illusion is deep.
~ Saul Bellow, To Jerusalem and Back