Hello zunaidfloris,
If you want to install woocommerce demo content, please go to Plugins > Add New;
enter WooCommerce plugin in search field;
find and install WooCommerce – excelling eCommerce plugin by WooThemes;
After that please install demo content according to this part of theme documentation: https://www.8theme.com/demo/docs/royal/index.html#!/demo_data_installation
Regards,
Stan Russell.