Download Windows OS ISO and USB drive images
This article mentions how to get the ISO or USB drive images for different Windows OS
If you want the selection between the ISO or USB drive images, then download the Windows 10 Media Creation Tool:

Another option to get the ISO images of the Windows 7 - 10 is to download this tool:

Media Lab Overview
LIACS Homepage
MM Conf
ACM Multimedia
Science Direct
IEEE Library
LIACS Publications
ACM Digital Library