If you already own a version of the game, you may already be entitled to the content:
To ensure you have a safe, up-to-date version with all features, use official storefronts: Shovel Knight: Treasure Trove Free Download (In...
The digital home for the game on Switch and 3DS . If you already own a version of the
Yacht Club Games released several major expansions (Plague of Shadows, Specter of Torment, and King of Cards) as free updates for anyone who owns the base Treasure Trove package. Unofficial & Modding Posts These methods are not endorsed by the developers
You may be seeing posts from communities like r/3dspiracy that provide guides for downloading the game onto modded 3DS hardware using tools like hShop . These methods are not endorsed by the developers and require custom firmware to work.
Older physical copies for platforms like the 3DS, PS4, or Wii U that are simply labeled "Shovel Knight" can typically be updated for free through their respective digital storefronts (like the Nintendo eShop) to include all Treasure Trove campaigns.