Geralt’s choice defines the ending:

You might be confusing "NSP" with "NGP" (Next-Gen Patch) . In late 2022, CD Projekt Red released a massive free update for The Witcher 3 on PC, PS5, and Xbox Series X/S.

The "Complete Edition" NSP generally bundles the base game with all official post-launch content:

The monster in the Eclipse Tower is not a creature. It’s a cage made of flesh — an amalgam of failed experiment and absorbed agony. The girls who vanish are not killed. They are merged into a silent, weeping mass of limbs and faces called the Cradle — a living anchor for the resonance ritual.

The Witcher: NSP — “The Last Cradle of the Black Sun”

If Geralt brings a lock of Renfri’s hair (from his witcher keepsake) to the Cradle, Mila recognizes her sister’s sacrifice and rejects the ritual. The Cradle releases the absorbed women — as children, reborn without memory. Sister Magdalen, realizing her daughter wouldn’t want this, destroys herself. Kaelen leaves to hunt actual monsters. Geralt returns to the Path, haunted but lighter.

Here are the three most likely scenarios. Please choose the one that fits your situation.

You have a modded Switch (running Atmosphere or SX OS) and you have downloaded or dumped a game file ending in .nsp . This is the standard installable format for Switch games.