Bluemagic0317: I had the very same problem with King's Bounty: Crossworlds GOTY (the screen flickered a few times and nothing more happened).
(using a laptop with a Nvidia GPU, and games uses that Nvidia GPU by default setting)

and I found a fix for this: (it worked at least for me - my game launches and I can play just fine)

- go to %UserProfile%\Documents\My Games\Kings Bounty Crossworlds
- open the file game.ini with an editor
- the first two lines were:
setf ~screenresoultionx 0
setf ~screenresoultiony 0
- change that 0 values to your actual screen resolution and save the file. After this action my game launches just fine :)

in my case (1920*1080 screen resolution - I have an external screen connected to my laptop)
that two lines look like this:
setf ~screenresoultionx 1920
setf ~screenresoultiony 1080