Building on the success of basic content-aware filling, CS6 introduced:

Because of this shift, Photoshop CS6 13.0.1 Final gained a unique legacy. It became the last safe haven for users who preferred owning their software rather than renting it. Even a decade later, a significant number of professionals and hobbyists continue to use CS6. They argue that for many tasks, the feature set of CS6 remains perfectly adequate, and the software runs efficiently on older hardware without the constant background processes required by modern cloud-connected applications.

If you have a key, you can download the official CS6 13.0 installer from Adobe’s legacy download portal (requires an Adobe account with a registered CS6 product).