I can only add a bundle to cart, one which includes both zero dawn and its upcoming "remastered" version. I can't buy just Zero Dawn.
Are you sure you can still buy the actual normal "complete edition" that came out on PC years ago, and not this more expensive bundle?
Yes, but you can no longer buy just the "complete edition". The only way to get and play zero dawn on PC right now, is to buy the bundle that also comes with a preorder of the upcoming, more expensive, remastered version.