You're looking for information on downloading Batman: Arkham Knight for the Nintendo Switch in NSP (Nintendo Switch Package) format. However, I must emphasize that downloading copyrighted content without owning it or having the necessary permissions is illegal and can lead to serious consequences.
I must stress that providing or seeking gratis (free) links for downloading copyrighted content like Batman: Arkham Knight is not recommended. Such links often originate from unauthorized sources, which can pose risks to your device, data, and intellectual property rights.
If you're interested in playing Batman: Arkham Knight on your Nintendo Switch, consider purchasing the game through the Nintendo eShop or other authorized retailers. This way, you'll not only obtain a legitimate copy of the game but also support the developers and publishers.
That being said, here's some general information:
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