If you need to install or reinstall Windows 10, You can use the Media Creation Tool to create a installation media using either a USB flash drive or a DVD.

You will be able to create a media for the following Windows 10 versions

Windows 10 Home
Windows 10 Home N
Windows 10 Home Single Language
Windows 10 Pro
Windows 10 Pro N
x86 & x64

Download: Media Creation Tool x86 or Media Creation Tool x64

For Enterprise editions please visit Volume Licensing Service Center