This demo was on a Mac using affinity V2. In my version you can rasterize by right clicking a layer and choosing rasterize from the menu, you don't need a live filter to do it. If you do want a live filter you need to be in the pixel persona (top left) then go up to the layer menu (at the top, not the layer studio on the right) and choose "New Live Filter Layer" the options will be "Perspective" and "Mesh Warp". Hope that helps.
