: Use DBI or Tinfoil to install directly from your PC via a USB-C cable to save time and SD space. Install via Homebrew :
The .rar file likely contains multiple .nsp or .xci files. You must extract and install these to your console using homebrew tools. Theatrhythm Final Bar Line [4DLC][AS] NSP.rar
The "" tag suggests this pack includes four major Downloadable Content updates and is likely the Asian (AS) regional version of the game. Theatrhythm Final Bar Line downloadable content : Use DBI or Tinfoil to install directly
This guide refers to the installation and content of the archive you mentioned, which appears to be a repackaged version of the game for modified Nintendo Switch consoles. Installation Guide for NSP Files Theatrhythm Final Bar Line [4DLC][AS] NSP.rar