Update using Envato Market plugin
If you are using Kalium theme (version 2 and newer) then please visit this article Update Kalium theme.
If you don’t see this plugin on your WordPress dashboard then it means that you have not installed the plugin. To install and activate the plugin you just need to go to Appearance > Install Plugins.
Envato Market plugin is very easy to use, but if you have difficulties please just read this guide that was made from WP Explorer.
How do I update the premium plugins?
Just go to Appearance > Install Plugins and install the latest version of that plugin.