Hi Juanjo You're right it's in the materials folder. I was using shops and there's no universal shader anymore. Is shops dead? maybe I should just stick to materials folder. Not sure about pro/cons between those.
Yes, the SHOPs workflow is dead. It has been deprecated by SideFX some Houdini versions ago and it could be even removed in the future. You should work always in the new /mat context. At some point this year we'll move also the render target SHOP HDA to /mat.