My friend found a (kind of ) solution. Uninstall 5.3.0, and install older version of KNIME 5.2.x. Then, update to 5.3.0. Vernalis has been already installed. Installed version is v1.36.7.
Latest version available in community hub is 1.36.5.
However, the latest version is 1.36.7.
This is a tentative solution until v1.36.7 will be available in the community hub, I guess.