Did you check the video in their post? That helped me. Once the gradient is installed, import hair swatch 13 (or 8, if old swatch system) in Photoshop and add a new adjustment layer >> gradient map. Pick the gradient you want to use and create a clipping mask layer over your hair swatch and it should keep the texture and change to the color without having to change blend modes. I ended up making an action for it, but I know someone shared one (simmandy?).
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