Download the one ring to rule them all cab file.   
Did a clean install of windows 10 and all of the video drivers (Nvidia and Intel ones too) but I still can't get the screen brightness adjustment working from windows. I can manually set it from the bios! I updated the bios to the latest version.   Latitude e5450, i5-5300u, Nvidia 830m
Can't adjust screen brightness on e5450