I just got my D-Link DNS-320L and have been trying it.
To access: http://dlink.vtverdohleb.org.ua/Add-On you need to authorize / authenticate. How do I gain access to the Add-On downloads?
You shouldn't need to register there.
Have you registered your device with mydlink?
Don't install the latest firmware update v1.06 just yet - if you have test the mydlink access via web browser and test apps - there has been issues.
If you need any help just shout up...