Downgrade vaadin version from 14 to 13

Downgrade vaadin version from 14 to 13?
Can it be done to already existed project?
Thx

It depends. In a trivial case, it would be just a matter of changing the version number from 14.0.x to 13.0.13 . If you’re using npm mode with Polymer 3 templates, you’ll need to do some manual work to convert them to Polymer 2 style. If you have components that are not available in 13 (like MenuBar), you’d need to check case by case if you can add them as separate dependencies to the version 13 project.