Some guys did an excellent job at slipstreaming an .iso file of Windows 10 See download link on MajorGeeks: http://www.majorgeeks.com/files/details/windows_10_bloatware_free_edition.html Question is, how can you "re-install" Windows Defender which was excluded from that .iso? You can't download it from Microsoft...
Posted here since someone did ask a related question here some 2 years ago.