Adobe do keep all the registrations that you have made with their products.
You can access it your self via your Adobe Username. It is part of the upgrade and registration process.
My guess is you should download the trial vers of CS5 and install that.
Then check what the upgrade path from 6.5 is (if any)
Hopefully some one can give you more info how you access your Adobe stuff. eg registration page etc
I'll give that a shot.
Thanks to you both.
When you install an Adobe upgrade the USUAL process is that you don't need to have the previous version installed, you simply enter the qualifying serial# when asked
I have also read that Adobe only offers upgrade pricing going back 2 versions... so a CS5 upgrade will work with CS4 or CS3 but not as far back as v6