Multiplatform Runtime (MPR) makes it possible to run applications and components written with Vaadin 7/8 inside a Vaadin 10+ Flow application.
The Multiplatform Runtime is available to all Vaadin customers in the Prime subscription tier. The project is licensed under the Commercial Vaadin Add-On License version 3 (CVAL).
Issues can be reported on the MPR issues public repository.
Follow the Migration Guide to configure your project to use MPR and port your legacy application to Flow