So a search for "taiko no tatsujin rhythm festival nsp update exclusive" likely refers to:

While there isn't a single "exclusive" article under that specific name, several high-quality sources detail the major and platform-exclusive updates for Taiko no Tatsujin: Rhythm Festival Top Articles & Patch Notes

Downloading NSP files for games or updates you do not own is a violation of copyright law and Nintendo's terms of service. Additionally, downloading these files from unverified sources ("exclusive" releases on random sites) carries significant risks:

An exercise-focused mode released in December 2023 to help players stay active while playing.