Hallo, our company is currently using Vaadin 8 to develop some internal web services.
Now we would like to try the Charts add-on but we can't find any link to download a VALID free license key for the Charts 4.0.5.: the only one we've found - and installed - resulted in the error message "License for Vaadin Charts 4 is not valid. Get a valid license from vaadin.com/pro"... any help will be much appreciated.