As of 2026, the most recent official version of Mario Kart 8 Deluxe is (released alongside the final wave of the Booster Course Pass). However, Nintendo does not distribute updates via .rar files or NSPs outside the eShop.
A compressed archive file used to reduce the size for easier storage and transfer. What’s New in Update 3.0.3? Mario Kart 8 Deluxe -NSP--CH--Update 3.0.3-.rar
: To use a legitimate version of Update 3.0.3, you simply need to connect your Nintendo Switch to the internet and let the system update the game automatically. Recommendation As of 2026, the most recent official version
: Files found on file-sharing sites with these naming structures are high-risk. They frequently contain "trojanized" installers or malware designed to compromise your PC or your Nintendo Switch console's custom firmware (CFW). Console Safety : Using unofficial files can lead to a permanent hardware ban What’s New in Update 3