You need to install the following to use Vaadin Designer:
Optionally you can also install Vaadin Plug-in for Eclipse as described in "Installing Vaadin Plugin for Eclipse".
Vaadin Designer is compatible with Eclipse Mars and later, available from www.eclipse.org/downloads. We recommend choosing the newest version of Eclipse IDE for Java EE Developers.
Vaadin Designer can be installed together with the Vaadin Plug-in for Eclipse, from the same Eclipse update-site. In Eclipse, go to Vaadin as name and http://vaadin.com/eclipse as location., press , enter
If you already have the Vaadin plug-in installed, just choose the Vaadin update site. Make sure the whole Vaadin category is selected (or at least Vaadin Designer), then clickto review licensing information and finalize the install. Please restart Eclipse when prompted.
Once installed, Vaadin Designer can be kept up-to-date by periodically running.