WPBakery Page Builder, Slider Revolution and Layer Slider are premium plugins that theme authors purchase extended licenses of them to be able to include those plugins on our theme for free. So you can use those plugins without any problem. Those plugins may offer some extra features that are activated only if you purchase a copy of those plugins. Then you also get the support for those plugins if you need support from the author.
We also wrote about this on many pages of our documentation site.
hi I have a problem activation layerslider plugins
Hi shimabaghdad,
WPBakery Page Builder, Slider Revolution and Layer Slider are premium plugins that theme authors purchase extended licenses of them to be able to include those plugins on our theme for free. So you can use those plugins without any problem. Those plugins may offer some extra features that are activated only if you purchase a copy of those plugins. Then you also get the support for those plugins if you need support from the author.
We also wrote about this on many pages of our documentation site.
Thanks!