If you have a problem with de-/activation CS6 you have to contact the Adobe support.
But be aware of: CS6 is no longer supported by Adobe, and this is a public forum... other users here can't provide any direct help... the only help I can offer is...
When you can't deactivate a serial number 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 Do be aware that Adobe's staffing is impacted by the virus, so wait times are long -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 . 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