hard to say what that is
Lanzzer
I would try "first":
place the game like:
C:\games\kingsfall\
this to know its not something about any protected folders or large-paths.
if this is not working, reply with:
- how much u see? if u immediately see that error or u see a black-screen, any logo, music playing etc.
what OS do u use? integrated GPU or not, is sound-device on/off? CPU/GPU memory.
after installing the .webp setup, did u try to restart the computer?
if nothing works, this will require a more debugging approach. let me know.