Windows update does distribute microcode updates. For example, https://support.microsoft.com/en-us/help/3064209/june-2015-intel-cpu-microcode-update-for-windows

Windows update does distribute microcode updates. For example, https://support.microsoft.com/en-us/help/3064209/june-2015-intel-cpu-microcode-update-for-windows https://support.microsoft.com/en-us/help/3064209/june-2015-i...