I'm having exactly the same problem.
I installed demo software a few months ago. Today I bought a license (server license for Win 2003)
When I told it to update the s/w, it tells me I'm good thru Dec08 and that today is (correctly) OCt1, but that my license is invalid or expired.
how do I get this license working? do I switch to your demo license file, update the s/w, and then put back my own license file?