The installation of every previously mentioned plugin will be required once after the theme activation.
Install them and Activate them.
In case if automatic plugin installation fails (as a rule it is because of your server settings), you can install them manually via your Dashboard: Plugins > Add New > Upload Plugin > Browse plugins archives.
Or via FTP, by uploading and extracting the plugin zip files into wp-content/plugins folder. You can find the zip files for plugin installation in the theme folder InTravel/framework/plugins.