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Homepage: Rufus
Wait for stable v3.5 or try the beta build below.

GitHub: Rufus 3.5 BETA
  • Add a feature to download official retail Windows 8.1 or Windows 10 ISOs
  • Add Windows To Go support for MCT generated Windows ISOs
  • Add a notice about the WppRecorder.sys Microsoft bug for Windows 10 1809 ISOs
  • Add a notice about trying to format a drive larger than 2 TB in MBR mode
  • Add a notice about Legacy boot when trying to boot UEFI-only media in Legacy mode
  • Report the full PID and command line of detected blocking processes in the log
  • Fix a potential silent abort when the drive is in use
  • Fix Quick Format option always being active
  • Fix some unwanted file system changes occurring after an ISO had been selected
REMEMBER: If you think you have uncovered an issue with this BETA, please report it!

Download v3.5 BETA:

The next version of Rufus will come with an option to download ISO files of Windows 8.1 and Windows 10. [..] you will be asked to select the edition that you want to download. For example, Windows 10 has Windows 10 Home, Pro, and Windows 10 Education.
via Rufus adds the ability to download Windows 8.1, 10 ISOs directly from the app - MSPoweruser