: This specific update for 1-2-Switch was released to provide minor fixes and support. In the context of the .rar file you mentioned, it likely contains the digital patch file required to bring the base game up to version 1.1.0.
: There are tutorials on YouTube that explain how to merge a base game NSP with its update NSP (like 1.1.0) into a single file for easier management. Important Considerations 1-2-Switch (NSP)(Update 1.1.0).rar
: The "NSP" extension stands for "Nintendo Submission Package". It is the standard format for digital games, updates, and DLC intended for the Nintendo Switch. : This specific update for 1-2-Switch was released