With an expired license the error messages contains a broken link:

You can upgrade your license here or for step-by-step instructions please refer to our documentation.

"here" points to:

http://docs.atlassian.com/confluence/docs-34/Confluence+3.0.2+Upgrade+Notes#Confluence3.0.2UpgradeNotes-licenseupgrade

while "documentation" points to:

http://localhost:8080/confluence/admin/{1}