Before you install Theme Realtor or any other Estatik WordPress real estate theme, make sure that you have installed required plugins, i.e. Estatik Simple or Estatik PRO or Estatik Premium. Without Estatik plugins, Realtor Theme will not have complete functionality you can see at Realtor Theme demo website.
You will be also required to install SiteOrigin Page Builder and Widgets Bundle plugin which is free and also required plugin to use this theme. These plugins are free and can be downloaded at wordpress.org plugins directory.