When you open a copy of Photoshop CS6 that you purchased, a notice displays that you can try this product for 30 days.
Note: Some Creative Cloud subscribers also report other CS6 products in addition to Photoshop CS6 have reverted to trial after installing the 13.1.1 update.
Install the Photoshop 13.0.4 or 13.1.2 update.
To install the update, open Photoshop and choose Help > Updates.
Creative Cloud subscribers may also need to relicense a CS6 product after installing the 13.1.2 update by clicking the "License this software" button, and signing in with their Adobe Id.
photoshop CS6, trial