Keep that USB drive in a drawer. One day, when Windows refuses to start, you will be very happy you made it.
Why? If you select "Upgrade this PC now," it won't make a bootable USB. We want the portable tool. windows 10 bootable usb download
The tool will show a list of your connected drives. Triple-check you have the correct drive letter (E:, F:, G:). Keep that USB drive in a drawer