It is best to find a Windows computer to create a bootable Windows 10 Media Creation Tool (MCT) (Windows 10 iso)
Find a flash drive that can be formatted (> or = 8 GB).
Download Windows 10 ISO File | Tutorials (tenforums.com)
Download Windows 10 (microsoft.com)
(There have been mixed results when attempting to create a MCT / Windows iso on a MAC.)