We have just released a new upgrade to our skins and plugins. The new version includes a lot of fixes, some new functionality, and is compatible with Roundcube 1.4 RC2. Although Roundcube 1.4 has not been released yet and it should not be used in production, you're welcome to test it with our plugins and see how they look and work. Just keep in mind that the compatibility is still in beta and we don't officially support it yet.
The new version of the skins and plugins that we have just released can be downloaded in our customer area.