Regarding "NSP" downloads (digital game files used for modded consoles), please be aware that downloading commercial games for free from third-party sites is considered copyright infringement and often carries security risks like malware. Official Ways to Get the Game
For those solely interested in the oldest title, Super Mario 64 is readily available via the official N64 app included with Nintendo’s premium subscription tier.
Downloading game files from unauthorized third-party sources carries significant risks.