The most reliable way to download an official, untouched ISO is via the "Windows TechBench" archive links. Microsoft retains these links for enterprise users, though they are not publicly advertised.
The Rufus USB tool has a built-in download feature (powered by Fido) that can pull various older Windows 10 versions directly for you. Windows 10 Version 1511 Build 10586 Iso Download
Educational perspectives and lessons learned The most reliable way to download an official,
: Increased the maximum number of tiles from 512 to 2048 and added wider, more functional context menus. more functional context menus.