There is no possibility to unlicence. I suggest you contact Adobe customer service, so that they credit you of an aditional licence. Adobe customer care can be contacted by beginning a secure chat session at https://helpx.adobe.com/contact.html?rghtup=autoOpen. Pop-up blockers need to be disabled! If the chat window fails to open, or is non-responsive, use a different device to start the interaction. Support phone numbers may be found here: https://helpx.adobe.com/contact/phone.html. Please note that phone charges may apply.