I just wiped and reloaded my laptop with Windows 10 after having my system board replaced. If you ever need to reinstall Windows 10, you no longer have to go hunting for the ISO. The Windows 10 ISO is publicly available for download.
You can head over to https://www.microsoft.com/en-us/software-download/windows10 and download it.
The tool downloads the Windows 10 ISO and can create installation media. Your choices of media include USB flash drive, DVD or just the ISO file.