Activation licences for the plugins that came bundled with the theme
The plugins that you got after the purchase are called bundled and we, as a theme authors, have purchased an extended licence for them. That means you don't have to activate them and they'll work for you regardless of that.
In the following text we'll explain how the bundled plugins work.
Bundled plugins offer the same core features and functionality as the standalone version of the item on CodeCanyon.
Some plugins may ask for a purchase code for registration/activation once installed, however, you can simply ignore these messages as bundled plugins do not require activation or registration. The plugin will still work as intended with the theme once the theme has been activated/registered.
When a plugin is updated, the theme author will include the latest version of the bundled plugin with their next theme update. So you can easily update the bundled plugin when you next update your theme.
You can read more about this here: https://help.market.envato.com/hc/en-us/articles/213762463-Bundled-Plugins