The error message means a Photoshop File is corrupt you need to re-install Photoshop, You can do that right on top of your current install. That will back level CC to 14.0. When you the use CC ment Help>Updates it should be updated to 14.2.1 and all you add ons a r activation will still be intact. Download CC direct installer follow the download instruction else you will be denied access. Download New Adobe CC Trials: Direct Links (no Assistant/Manager) | ProDesignTools
The link will help you with install and updatre errors like you had Photoshop: Basic Troubleshooting steps to fix most issues
