Downloading NSP files from unauthorized third-party websites is dangerous for several reasons:

Searching for a "free NSP download" of Super Smash Bros. Ultimate typically leads to sites that facilitate software piracy, which is illegal and carries significant security risks. What is an NSP File?

: In the homebrew community, users often "dump" their own legally purchased games into NSP format to create backups or to play them on emulators like Yuzu or Ryujinx. Risks of "Free" Downloads