Use Microsoft’s Media Creation Tool to download and create Windows installer on a USB flash drive.  You may do that from any computer, it doesn’t need to be the computer on which you will perform the clean install. You may use that same installer flash drive on as many computers as you like.  Here are my detailed steps to perform a clean install of Windows. And, here's another description of the install process, from a Microsoft MVP.
Dears,  I need your advice to clear one doubt, can I create Windows 10 installation media directly downloading from the Windows website, or should I create it from the Old windows version. Also, can I use the same Media drive to reinstall fresh windows on multiple systems or do these need to be individual/separate (created from the installed windows).  Thank you 
m15 R1, installation media for Windows 10