Did you do that with all the extensions files separately or combined?
It will only work separately.
First, when you installed SketchUp, Did you install SketchUp the right way? Meaning: Right-clicked on the downloaded installation file and choose : Run as administrator. If not or not certain, do it now and you will be prompted to ‘repair’. Choose ‘repair’
for the method displayed in the video, do you paste them in the correct folder (normally it is hidden)
be sure to have SketchUp start up again.