This guide assumes legitimate ownership of the game and use on a legally permitted device. Installing NSP files or updates from unauthorized sources can violate terms of service and local law.
The search result you provided appears to be a link to a Google Drive file containing an for Donkey Kong Country: Tropical Freeze
You need to dump your prod.keys file from a legitimate Switch and place it in the emulator’s keys folder. The update NSP is encrypted; keys decrypt it.
You likely installed the update to the wrong storage location (e.g., NAND vs SD card). Use DBI to see all installed titles and remove duplicate copies. Also ensure you didn’t launch a forwarder or a different version.
Nintendo Switch File Type: NSP (base game) + Update (Ver. 1.0.1) Region: USA / EUR / JPN (multilingual) Size: Base ~6.5 GB / Update ~150 MB