Silly question but, where (what brush collection) should the Airbrush Pen Opacity Flow brush be in?

I have CS2, download version, windows. I can't see any such brush in the ones that came with CS2 scratches head

I was reading an older issue of ImagineFX , one artist noted using this brush so I went to give it a try and...nada...hm.
Did I miss installing them as an extra, or what?

thanks for any help :)

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