No legal method exists to get newer maps than ~2016 for this device for free, because the map data is proprietary and no longer licensed for public distribution.
Blaupunkt TravelPilot DX 2013-2014 update is widely considered the final official map update released for this legacy CD-based navigation system blaupunkt travelpilot dx 2013 2014 free
While "free" downloads or torrents (like RAR files) are often discussed on automotive forums, they are Technical Risk: No legal method exists to get newer maps