Hi, you probably are logged in with the wrong account, in your account page, if you don’t see the license with its expiration the real license is associated with another account. You should even see the difference in the license code you have in your account page and the one set on Newsletter/Settings.
Pelase contact me at stefano@thenewsletterplugin.com and write me the license you see in your site (Newsletter/Settings).
Thanks.