Disclaimer: This is for educational discussion of file structures only. Downloading copyrighted NSPs you do not own is illegal in most jurisdictions.
If you have a legitimate backup of your own cartridge and want to apply the update manually:
The Sinking City frequently goes on sale for as low as $9.99 to $14.99 (down from $49.99). Sites like Deku Deals track these sales. Spending $10 is far cheaper than buying a $200 RCM jig or paying a technician to install a modchip.
Buy a used physical cartridge from GameStop or eBay. You can then dump that ROM yourself using a homebrewed Switch (which is legal in many jurisdictions for backup purposes). This gives you the NSP file you want without piracy. the sinking city rom nsp update dlc switch free
The Sinking City on Nintendo Switch provides a unique portable experience of Oakmont’s Lovecraftian mystery, maintained and self-published by its developer, Frogwares. Official Game Updates and DLC
To ensure the best performance and access to all content, use the official update channels:
Updating Software: From the HOME Menu, highlight the game icon and press + or -. Select Software Update > Via the Internet to download the latest performance patches. Available DLC: Worshippers of the Necronomicon : Adds three new side quests focused on the Necronomicon. Merciful Madness Disclaimer: This is for educational discussion of file
: A bundle of three investigative cases that were originally a timed exclusive for the Switch Investigator Pack
: Includes early-game equipment like the Tommy Gun and health/sanity kits. Free Content and Upgrades
The Ultimate Guide to NSP ROM Updates: A Step-by-Step Tutorial Nintendo has increased its legal aggression dramatically
Nintendo has increased its legal aggression dramatically. While emulation is legal, downloading a ROM or NSP from a public index is not. In the past year, ISPs have been forced to hand over logs of users torrenting Nintendo Switch games. The Sinking City is specifically monitored because it is a mid-tier indie title; security companies use it as a "canary" to catch automated piracy bots.
Furthermore, the experience of a legitimate copy is simply better. The update DLC Switch free files circulating on forums like /r/SwitchPirates (which was banned) are often missing the 60fps unlocker or the high-resolution textures added in the "Next-Gen" update that backported to Switch.