You download the Base Game (NSP), the latest Update file (NSP), and individual DLC files (NSP) separately, installing them sequentially using an installer like Tinfoil or DBI.
The co-op mode found in other versions was scaled back on Switch to maintain performance. A Hat in Time Switch NSP UPDATE DLC
Ensure you have the legitimate .nsp file for the latest version update (e.g., v1.0.x) or the DLC packs. You download the Base Game (NSP), the latest
Select the A Hat in Time [Update].nsp (ensure it is the highest version number available) and overwrite the base file. Select the A Hat in Time [Update]
This is advanced and risky, but it keeps the search for “A Hat in Time Switch NSP UPDATE DLC” alive among tinkerers.
“Snatcher’s Hit List.” The screen went black. When it returned, Hat Kid stood in a void. No platforms. No enemies. Just a single, floating hourglass.