It looks like you're looking for useful content regarding Assassin’s Creed Rogue for Nintendo Switch, specifically the NSP file format and DLC packages.
The Siege of Fort de Sable: A fort raid mission set in the North Atlantic territory.
Assassin's Creed: Rogue on the Nintendo Switch is part of The Rebel Collection , a compilation that includes both Assassin's Creed IV: Black Flag Assassin's Creed Rogue along with all previously released DLC. COGconnected Review Summary
The Nintendo Switch version of Assassin's Creed Rogue is part of the Assassin's Creed: The Rebel Collection, which bundles the game with Assassin's Creed IV: Black Flag. This compilation provides the complete single-player experience, including all previously released downloadable content (DLC) and modern enhancements tailored for the Switch. Assassin's Creed Rogue: DLC and Bonus Content
: Explore the North Atlantic to find the remains of Sir James Gunn and unlock his unique Armor and Sword The Siege of Fort de Sable
Ubisoft Club: Some cosmetic rewards and legacy outfits may require a link to a Ubisoft Account to unlock.
Some third‑party websites repackage the game as an NSP + update + unlocker for Time Savers, but those are not official and may contain malware or trigger a Nintendo ban.