If you own a legitimate cartridge or eShop download, this update would download automatically via Nintendo’s servers. However, for those using custom firmware (CFW) like Atmosphere or SX OS, the serves as an offline installable patch.
To use this update file effectively, you should refer to the following types of "paperwork" or documentation: Night in the Woods -NSP--Update 1.0.2-.rar
Which of the three would you like?