There should not be anything preventing you from reusing the license, unless you have the two allowed activations tied up in inaccessible installations. If that is the case then just contact Adobe Support thru chat and ask them to reset your activations. Do not ask for more than that or they will send you back here where no one can provide that service.
Chat support - For the link below click the Still Need Help? option in the blue area at the bottom and choose the chat option...
Make sure you are logged in to the Adobe site, have cookies enabled, clear your cookie cache. If it fails to connect try using a different browser.
Serial number and activation chat support (non-CC)
Forum Success Guide: https://forums.adobe.com/docs/DOC-5601