Serial number no longer valid. If there was a billing issue I missed seeing email. Missing an important deadline and software isn't working.
What software, and what version?
Cloud programs do not use a serial number... you sign in to your paid Cloud account to download and activate programs
Credit card https://helpx.adobe.com/utilities/credit-card.html
Change Account https://forums.adobe.com/thread/1465499 may help
Retrieving data ...