I don't think you can.
When you have used up all your authorizations (6 I think) you can contact Adobe Live Chat and they will reset all your authorizations.
You then reauthorize the devices you still use.
Unfortunately, Adobe do not support their DRM infrastructure properly so there is no web page to view and edit your authorizations.
Thank you. I looked everywhere for a list of all my current devices that I have authorized with no luck.
Adobe Live Chat will NOT help with this. I just contacted them. they told me to come here. How do I de-authorize my old computer? There doesn't seem to be an option in the help.
I'm having the same problem. Adobe online chat are pretty useless. They say they cannot help to deauthorize my pc. Told me to look at the forums but nobody seems to know the answer