Thank you for the information, HunniHope!
Weird: on further review, this demo is the only one I have in my marketplace listings for this item, but it's a different SKU from the demo linked by the full versions of the product. I'm not sure how I managed that, but it would've been something I did in about 2014, so it's lost to the mists of time. I've corrected this and relisted the demo and everything appears to be correctly linked now, so this should be resolved.