A trial key is only valid for a limit time and allows to test all features without demo limitations. Due to the time limitation of the key, you can use it for a few weeks and than it stops working.
We setup a form to request a license key:
Request Trial License Key
We may limit who can get a trial and filter out the requests looking like spam.
But otherwise I'd expect a lot of people would like a free trial. Please understand that trial keys are not intended for deployment of solutions as keys expire. Our regular keys don't expire and can be used forever with the plugin versions released before a given date.
You can also explicit register for newsletter, so you know about new releases and events.