This is the safest "link." Search for Samurai Shodown . The base game NSP is downloaded directly from Nintendo’s CDN. Updates (v2.4.2 as of writing) are free. You purchase DLC through the in-game shop or eShop.
Unlike the arcade-perfect release on PS4, the Switch version of Samurai Shodown launched with compromises. The initial cartridge (or base NSP) ran at 60 FPS but suffered from lower resolution textures and longer load times. samurai shodown switch nsp update dlc link
Comprehensive Guide to Samurai Shodown for Nintendo Switch: Updates, DLC, and Collections This is the safest "link
Do not search for generic "NSP download" on Google. Use DuckDuckGo or Yandex with the specific string: "Samurai Shodown" "v2.4.1" "NSP" "1fichier" . Cross-reference the file size with the table above to avoid downloading a fake link that infects your PC. You purchase DLC through the in-game shop or eShop