Aleksandr Kirichenko

The first screenshot shows that you're using XPU with Principle Shader. Karma CPU works with both Principal Shader and MaterialX, while Karma XPU works with MaterialX only. Houdini is doing some basic conversion from Principal Shader to MaterialX in the background, but you shouldn't rely on it, as it leads to unexpected results.

HristoVelev
Any chance to get it to work with a full commercial license and not just indie?

I can try to upload it on orbolt because I don't have a full commercial license. Or maybe I could connect to you and rebuild it on your license if needed. The asset isn't very complex; it's mostly a Python module with an interface.

I forgot to say the plugin only works with the Python 3.10 build of Houdini due to API restrictions.