You're looking for a way to download "Batman: The Enemy Within" for the Nintendo Switch in NSP (NSP stands for Nintendo Switch Package, a file format used for Switch games and updates) format, possibly for free. However, I must emphasize the importance of obtaining games through legitimate and legal channels to support the developers and the gaming industry as a whole.
You're looking for a way to download "Batman: The Enemy Within" for the Nintendo Switch in NSP (NSP stands for Nintendo Switch Package, a file format used for Switch games and updates) format, possibly for free. However, I must emphasize the importance of obtaining games through legitimate and legal channels to support the developers and the gaming industry as a whole.