OK so I have been battling this with Mercedes-Benz and they insist I can update the maps by myself using the MB Download Manager and an SD Card. My issue is that I have a 2015/2016 DVD and PIN which I uploaded to the HDD. They seem to claim that there is an SD Card and I can manually update the SD card going forward by myself for free. So far I tried buying a new blank SD Card and pointing the download manager to it. Captain obvious the card has no info about the target car. So now I will attempt copying the DVDs to the SD Card and feed it to both the car and download manager, while I wait for further clarification by MB customer services. Apparently a US based company creates an SD card which is specific to your car and doesn't need a PIN going forward but it might need a more sophisticated approach.