Cannot see the icon for SketchUp Diffusion

Cannot see the SketchUp diffusion icon anywhere. Have even checked in these forums and tried to reset toolbar. I have version 6.5.5 and I have heard that it’s not available in this version, that I should revert to 6.5.2 but I do not know how to do that without uninstalling (I don’t want to lose my subscription and have to pay again). Can someone please guide me?

this one ? scroll up a bit maybe ?