You can always get the latest updates of the Premium plugins with the Theme update in the Theme Package.
And there is no need to activate or purchase a new license for this plugin. This plugin is already included in the theme package and already purchased the license by P-Themes. This activation message is for those who want to update the plugin directly from their website. In our case, you can receive the updated plugin always with the theme update release.
So no need to activate it, just ignore the message and feel free to use it.
You can not use the library/template of any Premium plugin including in any Theme Package, If you want to use the premium plugin library/template then you have to purchase that particular plugin license separately, this is the Envato policy you may wish to confirm from them as well.
And about using the SVG in Slider Revolution, please read and follow the instructions written in the official documentation of the Slider Revolution.