I have Adobe CS-4 running on my Imac. My concern is that CS-4 will not open RAW files from My current (newer) digital Pentax DSLR. I am happy with my current edition of Photoshop, and would rather NOT spend 6 to 7 hundred $ to upgrade. What are my options? I really DO enjoy the RAW file adjustment option in Photoshop that "works" with my older DSLR Pentax camera bodies.