All you should need to do is install CS6. You will need you CS5 serial as well as your CS6 upgrade serial. The CS5 serial can be an upgrade serial, You do not need to install CS5 first. But you will need your CS5 serial for it the only product that qualifies for a CS6 upgrade. Be sure to use CS6 menu Help>Updates after you install. CS6 is very buggy without its updates.
Thanks JJ. I'll give that a go this weekend.
To piggy back this question, I have Cs6 installed and want to upgrade my processor / motherboard. CS6 was installed many years ago from a DVD and in the "info" slot it says:
Adobe Photoshop Version: 13.0.1 (220.127.116.11 20131024.r.34 2013/10/24:21:00:00) x64
Operating System: Windows NT
Are the update files still on the adobe web site to update Photoshop CS6 extended to the latest update position?