-1- Download your copy of CS3 on :: http://labs.adobe.com/
-2- Install it and open it choose the 30day tial.
-3- Close it and browse 'C:Program Files\Adobe\Adobe Photoshop CS3\AMT'
-4- Look for the file named 'application.sif' and change it to 'application.xx'.load CS3 again, enjoy no expire
