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NSPs are legally only backups of your own cartridge or eShop purchase. Dumping your own cartridge is legal in many jurisdictions; downloading from the internet is not.
A: No. Most Switch update NSPs are cumulative. Installing the latest UPD alone is sufficient. kao the kangaroo rom nsp update dlc switch upd
A: Ensure the region matches the base game. Also, launch the game once after installing base, then close fully, then install UPD+DLC. Some DLC requires reaching a certain point in the game (e.g., The Lost Crystals only appears after beating the final boss). NSPs are legally only backups of your own