Ok, I found out how to install the drivers by going into visual BIOS and selecting "always enable" for the iGPU.
However, now I have a new problem, the only way to get video from the iGPU from boot is to select "always enable" in the BIOS.
If I select "enable if primary" and leave primary video adapter as "auto", it never seems to be able to detect there is an HDMI cable plugged into the onboard video, even when I select HDMI as the primary iGPU video output port.
Has anyone seen this behavior before?
If you have an add-on graphics card installed on your system, it will disable integrated graphics from your Intel® HD 4000. You fixed part of the issue by turning on the "always on" setting in the BIOS, but by setting it to "auto", it will still take the card as priority. If you designate the on-board graphics as the primary video adapter, instead of leaving it at auto - does your onboard HDMI work properly?