License for Vaadin Charts 4

Hello

I would like run vaadin dashboard from github. When I try compile and run it I have got error "License for Vaadin Charts 4 is not valid. Get a valid license from vaadin.com/pro"

I downloaded license for Charts from Vaadin website but on that page is informataion that license is for Chart version 3. 

Where can I get trial license for 4 version?

Regards

I think we messed up and didn't think this license check for Vaadin Chart 4 pre-releases through. We'll figure it out somehow. Hopefully soon.