Hi mizatorian, thanks for sharing your problem, this is a Google result: "The cause for the “FATAL ERROR in Vertex Shader compilation” on the game launch are outdated DirectX drivers. To fix the issue, you can either update your PC's DirectX drivers (I) or turn off the shaders from the game files (II). The affect of the shaders on the gameplay are minimal. "

Here is a link to a version without shaders: Goldsaver Adventure on GoogleDrive

The shader makes a small flash when an enemy is hit. Also consider updating your DirectX