I just got this working using the above method and the below drivers that I beleive are the latest? I have an i5 Haswell with 4600 onboard being pushed to a Samsung 9500 TV. It is playing 4K on YouTube flawlessly so far. Temps get pretty high but nothing dangerous.
https://downloadcenter.intel.com/download/25860/Intel-Graphics-Driver-for-Windows-10-15-40-4th-Gen-