Your screenshot is very small for some reason, I don't see anything there.
Does Zmodeler write "Expired" for your license while it's not expired? You can try Revoke and generate new license key once. Don't do it multiple times, give only one try. In most of cases, "Expired" license is a result of attempt to change date on computer. In rare cases it's bounded to an attempt to install new license key over and installation of an old expired license key. If this is the case, get a clean copy of ZModeler from the website and activate it with your license key.
In case of dates cheating you might get in trouble when new license key (even the newly-purchased) could be rejected too. send me a PM if you've stuck in such a situation).