While looking up NSP files for Rubber Bandits is common among those exploring the technical side of the Switch, the best way to support the developers and enjoy uninterrupted online matchmaking is to purchase the game legally.
: Each pack (Supporter, Fur Party, etc.) has its own individual NSPcap N cap S cap P Rubber Bandits for Nintendo Switch - Nintendo Official Site rubber bandits switch nsp dlc update eshop exclusive