Photoshop CS5 introduced "Content-Aware Fill," a revolutionary tool that could magically remove objects from a background. CS6 took this further.
Adobe's activation servers for CS6 have been unstable since 2019. While Adobe says they "still support activation," many users report needing to call customer service and argue for 30 minutes to deactivate. Furthermore, that serial number may have been used already. Adobe Photoshop Cs6