The free Modeler Academic Edition expired on 01-July-2018. An update will follow shortly.
Unfortunately there is no expected release date for the updated version at this moment.
If your work is currently blocked while you have urgent deadlines, you may consider joining the University Modeler Program. This will allow you to use the full version of Modeler at heavily discounted rates. Please reach out to firstname.lastname@example.org for information on the University Modeler Program.
We'll keep you posted on this thread on any updates regarding the free Modeler Academic Edition.