Sonic Team and the publisher issued only brief patch notes for stability and minor bug fixes. No official announcement confirmed free DLC or major content. Yet players noticed small in-game changes after the update: improved text layout in some languages, a fix for an achievement bug, and smoother transition screens. These validated the NSP analysis: the update was real but modest.
Prepares the base game for the Plus expansion features [1]. Sonic Origins DLC Packs Explained
Are you trying to from the home screen?
For Switch owners who already own the base cartridge, buying the Plus DLC is the only legitimate path to Amy and Game Gear games.