When you install or update one of our themes, you will receive a WordPress notification message advising you to install and activate the required and recommended plugins. Follow the link provided in the notifications and install the plugins.
You must install all the required plugins if you want to import the demo data.
You don’t have to activate them and they’ll work for you regardless of that.
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.
You can read more about this here