I think you are looking at it wrong. You are buying the hard drive and program for $159
They allow you to go ahead and download it now if you want. It's huge; the drive will arrive shortly after you finish downloading. I don't see a separate download. It's "Hard drive & Donload" .. meaning you don't have to wait if you don't want.

PGMuic has mentioned before that the price difference they could offer between download and hard drive would make it silly not to get the drive. If nothing else, you have a backup of everything. I don't see a separate download option.
If you notice they don't throw that option in for Audiophile version because of the size.

That said, your best advice is to call the sales department; they will know if they can bend any on download only deal. Us users here just see the same thing you see (although in a different way sometimes).

I do not work here, but the benefits are still awesome
Make your sound your own!