Activation Limit Reached

if you have cs2, cs3 or cs4, you can no longer activate.

if you have cs5, cs5.5 or cs6, you can ask adobe support (per @John T Smith message) to reset all activations.  this will deactivate all current installations (which may be problematic), but will allow the activation on two computers, assuming a number of things (eg, compatible os, serial number matching the installation file, no revocation of serial number etc).

When you can't properly deactivate a serial number
(this is the ONLY support Adobe still offers for old programs)
BE SURE TO ONLY ASK FOR ACTIVATION SUPPORT TO ADJUST YOUR ACTIVATION COUNT
You may need to PERSIST or TRY AGAIN to find a support agent with more experience

Be sure to remain signed in with your Adobe ID before accessing the link below
Do be aware that Adobe's staffing is impacted by the Covid virus, so wait times are long
.
You MUST make sure that your browser does NOT block ads, scripts, or pop-ups
You MUST also allow 'cookies' in your web browser for the link to work
.
This link will go directly to the chat option
Type "Agent" in the chat box to bypass the chatbot and be connected to a person
-Meaning type in the word Agent without the quote " " marks
https://helpx.adobe.com/contact.html?rghtup=autoOpen
or
Twitter tweet @AdobeCare
.
Adobe does NOT do support by email, so beware of answering anyone who sends you a private message
-click for more information about scammers https://tinyurl.com/10791730