files from unofficial sources carries a risk of malware or corrupted data. Nintendo Support following this update or more info on future Splatoon 3 patches Splatoon 3 Update History - Nintendo Support
To use the NSP file, you will need to extract the contents of the .rar file to a folder on your computer. You can then transfer the update files to your Nintendo Switch console using a compatible storage device. Splatoon-3-Update-9.2.0.NSP.rar
It sounds like you might be looking for information regarding a specific for a Splatoon 3 files from unofficial sources carries a risk of