Why the specific obsession with the update file rather than just a "complete" pack?
, the HOME Menu options will confirm the "a" patch has been applied. Update Highlights & Content Version 4.0.0a (Latest) : Primarily adds support for playing the game on Nintendo Switch 2 , including performance adjustments for improved gameplay. Version 4.0.0 (Major Content)
Shortly after launch, Nintendo began adding "Dream Friends"—iconic characters from Kirby's past—as playable allies via free updates. Kirby Star Allies | Kirby Wiki | Fandom
To install updates on a FAT32-formatted SD card, remember that files larger than 4 GB must be split. While the total size for Star Allies is under this limit, some users prefer tools like the DBI Installer or Tinfoil for direct network installation to avoid manual file management. How to Update