Thanks for the reply
The hardware version is "A", I think that this is the only version ever released!
I found the newer version of HDDViewer here
http://support.dlink.ca/ProductInfo.aspx?m=DNR-202L
The link to the download is as shown below
ftp://ftp.dlink.ca/PRODUCTS/DNR-202L/HDDVIEWER_1.03.03.EXE
It shows that it was released on 10/11/16, although the file name says 1.03, the program itself says it is 1.30.
The current firmware is v2.04.03
As far as testing the device connected directly to my PC, it is currently impossible, unless I drive for 7 hours, and then walk for 1.5 miles through deep snow down an unmaintained road. This would explain why I use a VPN for communications with the device!
I find it difficult to understand what method of communication the HDDViewer might be using that would not be supported over a VPN link, when all other access to the device works with no problem, but I have no idea how the HDDViewer actually works