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Underscores are not necessary, you can rename the folder like I did; it works fine (I do this also for my Drivesmart 65 NTU maps).
As I do have a Zumo 660 which works best with NT maps I need JCV-files for this device and the corresponding NT maps.
The thing I overlooked in your first post in this topic is, that it contains the Mapsource/Gmap folder with

However when I tried to download from the Turkish Dosyaupload site nothing happened, until I did disable my Norton SafeWeb extension in Chrome.
At last I downloaded the .gmap folder, remamed it without underscores and copied it as C:\ProgramData\Garmin\Maps\City Navigator Europe NT2021.10.gmap
Basecamp now shows the NT 2021.10 map.