

This should effectively resolve the not launching or starting problem with CK3. If all else has failed to resolve the issue, you should try to reinstall the game as well as the launcher – the Steam client.
CRUSADER KINGS III INITIALIZING GAME WINDOWS
Ensure that your Windows is updated to the latest build.

You must also do the same for the operating system.
CRUSADER KINGS III INITIALIZING GAME DRIVER
New games are designed to run on the latest driver software and an outdated software can cause conflict and lead to the Crusader Kings 3 not starting or launching problem. If you have not updated the graphics card in a while, we suggest you do it before launching the game.

Stick around and we will help you resolve both the errors in the game. While the Crusader Kings 3 not launching can be caused due to initialization problems, lack of privileges to the game, corrupt game files, outdated graphics card drivers, outdated Windows, or a problem with the launcher. The error message can vary and is usually one of the below. Users can encounter the Crusader Kings 3 d3dx9_41.dll or d3dx9_43.dll missing error or any other. The d3dx9 dll file is a part of the Microsoft DirectX and programs that rely on the Microsoft software will fail to launch and result in an error when there is problem with the DirectX files.
