You need to use Openbrf https://forums.taleworlds.com/index.php/topic,72279.0.html to change the shaders. Load a .brf file from the OSP pack, highlight a model/mesh. This will show its material in a panel to the right of the list of models. Click on the material to get into its components. The first component is the shader.
For every material using the failed shader overtype with one of the suggested alternatives listed in pages 2 and 3 of this thread. It's easier than it sounds as several models share the same material.
For every material using the failed shader overtype with one of the suggested alternatives listed in pages 2 and 3 of this thread. It's easier than it sounds as several models share the same material.
