https://wccftech.com/the-witcher-3-mod-improves-anti-aliasing-nvidia/

A new The Witcher 3 that brings improvements for anti-aliasing has been released online recently.

The new mod, which can only be used by NVIDIA users, uses a combination of in-game anti-aliasing with NVIDIA FXAA and ReShade depth-based SMAA. The improvements are not massive, but they are definitely noticeable.