Hi rogermansur,

WPBakery Page Builder (formerly Visual Composer), Revolution Slider and Layer Slider are premium plugins that we have bought 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 offers some extra features that are activated only if you purchase a copy a those plugins. Then you get the support for those plugins if you need to support from the author.

We also wrote about this on many pages of our documentation site.

— http://documentation.laborator.co/kb/kalium/visual-composer-plugin-introduction

— http://documentation.laborator.co/kb/kalium/revolution-slider-2

— http://documentation.laborator.co/kb/kalium/layerslider-2

P.S: We will update Kalium theme very soon so when you perform the update you can also update those plugins by going to Appearance > Install plugins.

Have a great weekend!

Hi Roger,

We have updated Kalium to version 2.1.5 so you can now update those plugins to latest versions that we support too

Hi Sandy,

Because when we released the Kalium 2.1.5 on Saturday the latest version of the Layer Slider was 6.6.2 but yesterday or today Layer Slider released version 6.6.3. We will update thus plugin on our next theme update.