As with any plugin to be installed, Kadence is very much the same. If you are using Kadence, then their plugins must be installed so that your website can function optimally.
Kadence plugins enhance the default WordPress block editor (Gutenberg) by adding additional blocks and features, including advanced heading, row layout, tabs, accordions, and more. If you’re using the free version, some features will be limited.
Installing Via Plugin Directory
Uploading Kadence plugins using the directory means these plugins are free, so they will not require a license.
Installing Manually
For premium plugins like Kadence Pro, you need to download the plugin from the Kadence website. Pro plugins will need a License Key to activate them.