The Switch version is a premium, one-time purchase (typically $11.99).
for the Nintendo Switch includes all major updates and previous mobile DLC (like the "Chapter 0" side story) as part of the standard base game. While the game is typically a paid title on the Nintendo eShop , official updates for the software are free to download for anyone who owns the game. Game Features & Content
If you see a site offering a "free Implosion NSP update" without owning the base game, it's likely piracy — which is illegal and risks malware. If you already own the Switch version, just connect to the eShop and update legitimately for free.
If you legally own the game (physical or eShop) but are using CFW for homebrew or backups, here is the standard workflow to apply a found NSP update:
To understand the search term, you need to know Switch file formats: