If you can not install the sample data using the One-Click import or you want to do so manually, follow the steps below.
1. Install the Required Plugins
Go to Appearance > Install Demos, click the demo you want to import and install all the required plugins.
2. Download Demo Data
Download the demo data zip file and store it on your computer. Unzip the zip file – DEMO DATA
3. Import Demo Data
Find the default-content.xml file from demo data zip file, log into your WordPress website and navigate to Tools > Import to begin the import process. Click on the WordPress option, Upload file and import.
4. Import Customizer Options
First, install and activate the free plugin Customizer Export/Import, then go to Customizer > Export/Import and import the default-customizer.dat file.
5. Import Widgets
First, install and activate the free plugin Widget Importer & Exporter, then click Tools > Widget Importer & Exporter and import the default-widgets.wie file.