reinstall of CS5 on new PC fails - serial not accepted

[Daniël5CA3]

I had a laptop crash and had to install everything on a new laptop 

When re-installing my CS5, the serial number is not accepted.

This was a student license from 2011.

My Adobe account from that time was not active anymore, so I had to create a new account (??)

and of course, that doesn't contain my license 

How can I reinstall it ?

I still have the mail from 2011 with the serial and the original install DVD but the combination doesn't work anymore.

Thanks for any help you can give me.

[John T Smith]

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
Click here https://helpx.adobe.com/contact/support.html

-click the chat icon at the bottom right of the page to open a chat session
-the chat icon looks like '3 dots inside a circle' at the lower right
-type AGENT into the chat window to connect directly to a person rather than the AI
Do be aware that Adobe's staffing is impacted by the virus, so wait times are long
.
Also: beware of answering anyone who sends you a private message
-click for more information about scammers https://tinyurl.com/10791730