Humm,
I do not know what it is you downloaded but I doubt it is the DL3 ver.
I just visited the Denon site and there is no mention of the DL3 upgrade. Then, I made the mistake of calling their wonderful customer service and was told DL3 is not out yet and that when it does come out, it will require shipping the unit to a service center for this upgrade

. I was clear that I have a DVD 3910.
The person I spoke with at Denon (he said he was in Chicago) was apparently just spouting the company line and was EXTREMELY rude when I questioned him on this. Apparently, at Denon customer service means you can be rude and evasive with customers (who have spent thousands of dollars on Denon products) who ask questions about product features that were promised, but have never been delivered. I may have purchased my last piece of Denon equipment.