Settings > Update & security > Advanced options > Choose how updates are delivered The settings for it seems to have existed for a while now (at least since 10130, but I vaguely recall it earlier than that), but I haven't witnessed it actually work. Was just seeing if anyone else may have seen it work or know if it's even supposed to be functional? Kind of hoping it starts working in the near future. 2GB+ for each new win10 build on Fast ring downloading on multiple computers on a slow connection is going to... not be fun