Hi,
Our company has several CS4 software packages installed on several Windows computers.
Some have been purchased from a store, others have been downloaded from the Adobe webstore.
Now I'd like to upgrade to CS6 on one of the computers; for this, I assume, I will need the serial number of the CS4 packaged installed on that specific computer, correct? but how can I find that out ?
Unfortunately, we did not keep track of which specific CS4 package was installed on which computer 
Already deactived CS4 in Indesign while unchecking the 'remove serial number' checkbox, restarted Indesign, and the computer, but nothing seemed to happen
Tried Adobe Chat, but after repeating the same question 3 times and the chat being closed (by Adobe) 3 times without any response to the actual subject, I gave up...not having had the impression that I was talking to a person by the way...
Thanks for help
Frederik