what exactly did you purchase?
You also keep on mentioning cec and the bios.. what bios? the bios on the NUC??
the CEC adapters I am familiar with are the ones that you plug the HDMI from the projector into it and then you plug it into the HDMI on the computer.. then you also plug in the USB from the cec adapter to the computer..
it does not matter what CEC device you use it can only be accessed from a single program.. so if you are running eventghost and have the cec plugin installed then you cannot have anything CEC related installed into Kodi. same goes vice versa.
You need to install the 2012 c++ runtime redist for x86 it can be gotten from https://www.microsoft.com/en-us/downloa ... x?id=30679
This is needed in order to use the plugin.. You then need to also install the drivers for the adapter. they are attached to the first post.. as well as the plugin.
whatever HDMI port the adapter is plugged into on the projector you need to set that in the plugins config under the HDMI port
Lets start off with that and see where you get.. remember uninstall anything related to CEC that is installed into Kodi.
install the redist and the drivers.
install the plugin and set the HDMI port.
also send me a link to where you get the adapter from. I want to take a look at it. I say this because if you bought the USB version but there is a setting in the NUC's bios you may have bought one when you didn't need to.. the cec adapters do come pre installed on some devices.. Raspberry Pi's are one of this devices.. A NUC may also be one. and if you have 2 of them on the same HDMI bus it may not work properly.
This is a MUST.. you MUST have the adapter plugged directly into the projector.. It cannot pass through an AVR or any kind of a video switcher. The reason why is not all AVR's or video switchers have a CEC pass through.