The Contra Anniversary Collection, featuring 10 classic titles, received a post-launch update adding Japanese versions, button remapping, and bonus content. Official updates are best obtained via the Nintendo Switch eShop to ensure safety and legality, rather than using unofficial NSP files. For more information, visit the Nintendo eShop Contra Anniversary Collection for Nintendo Switch
The most significant update for the collection (v1.1.0) was released shortly after launch to address major fan requests. Japanese Versions contra anniversary collection switch nsp update link
Japanese Versions: Added the option to play Japanese versions of numerous titles, such as Contra Spirits (the Japanese version of Contra III), which includes original cheats like 30 lives and stage selects. The Contra Anniversary Collection
The Contra Anniversary Collection features several new additions and improvements, including: featuring 10 classic titles