Brian,
I'm just repeating what I have been told by Hollis. Sorry if it wasn't helpful.
No apology needed but I've been diving Oceanic's computers for ~15 years and downloading them as long. It would only make sense to me for Hollis and Oceanic to utilize their parent company's existing download program and cable (since their VersaPro cables mates perfectly to the DG02 port).
FWIW, Hollis added the download program literally just yesterday to their website. I'll install it this weekend.