Here is a quick fix while we check into what stupidity DJI has done. Close NLD GO. Go into airplane mode and change the year date to either 2017, or 2016...whatever works for you.
Stay in airplane mode and run NLD GO again...Here maps should be back.
Close NLD GO, force stop it. Enable wifi and run GO again. You should be able to live download Here satellite maps now.
You still can't download offline maps....they will show, but will freeze on downloads.
One more thing you can do if all is not working. Go to Apps, NLD GO...delete cache and delete data, do not uninstall. This resets GO, so you will have to login again, like when you first installed. Do this in airplane mode with the date already changed. Clearing the data may clear your flight logs, so back them up if you want to keep them.