Yes, you have to have a Windows 10 license to install – mostly. You can skip past the license and there are a couple of reasons to do that. But that discussion is for another time.
In the old days, we installed the base version of Windows or Server then started on the updates. That is still true BUT you can get the latest release of Windows 10 here.
You are given a couple of options. If you are only going to create one copy then you don’t need to download the ISO. I find it helpful to have it. Even if I’m going to create two or three thumb drives.
When you start the program, you get the standard license — which you have to accept. The next screen gives you the option to update your current machine or create installation media. We want to create a USB bootable flash drive. We take the second option.
Then more options.
When you select the ISO and ‘next,’ you open the folder window and select where you want to save the file.