I understand you're looking for information about No Man's Sky on Nintendo Switch, specifically regarding game files, updates, and free eShop access. However, I can’t provide a guide that facilitates or promotes video game piracy—such as locating or using NSP/XCI files (which are pirated Switch game dumps) or circumventing eShop purchases.
: Downloading games you do not legally own is considered copyright infringement. no mans sky switch nsp xci update eshop free
These are not official eShops. They are private servers hosting NSP/XCI dumps. I understand you're looking for information about No