You do not need to risk downloading illegal files to see if you enjoy the game. Nintendo offers a safe, legal alternative:

Unofficial ROM and NSP distribution sites are notorious for bundling malicious software, adware, and trojans into their download links or files.

Corrupted or malicious NSP files can permanently damage your Nintendo Switch operating system, rendering the console completely unusable.

Any progress, Mii characters, and relationships you build in the free demo will carry over directly to the full game if you decide to purchase it later.