It works, thanks, but not that easy like described in the video - you have to create layer in the texture/bump/reflectence ..... e.g. tab and then the order of things is inside the layer:
3. (Projector, too) Texture element
2. (Projector) Texture Element alpha (activate: Layer Mask)
1. Base texture
Its a workaround, video very helpful, anyway.
Maybe that feature should be a future feature request.