Here is why that specific phrase matters more than any serial number. Let’s be clear: Adobe CS6 was the last great perpetual license suite. You bought it once (for $2,599 in 2012), and it was yours. When Adobe switched to Creative Cloud in 2013, they effectively killed ownership.
However, the “Working, Updatable” CS6 is not the original retail disc. It is the result of a decade of reverse engineering. Why? Because Adobe tried to kill CS6 remotely. Adobe CS6 Master Collection -Working updatable-
If you find a copy that lets you install Photoshop, run Adobe Update Manager to get the 2014 camera raw updates, and never asks for a login—keep that installer on a hard drive in a fire safe. They aren’t making any more. Here is why that specific phrase matters more