Serial number already in use

[Gen5F87]

Trying to install Adobe creative suite 5.5 on my new computer that has no disc drive but I keep getting the serial number already in use message. I have 2 old computers. 1 for sure had it installed and the other possibly but can't remember, rarely used it. 

[Peru Bob]

Please go to Adobe Customer Service (make sure to sign into your Adobe account first) and only ask to have your activations reset:
https://helpx.adobe.com/contact.html?rghtup=autoOpen will automatically open the chat window.
Type "Agent" in the chat box to bypass the chatbot and be connected to a person.

You may also be able to contact Adobe by phone:
https://helpx.adobe.com/contact/phone.html