In your Wordpress admin panel navigate to Appearance>Themes>Add New and click on ‘Upload Theme’. Locate the ‘vivid-by-divisoup.zip’ file on your computer and then click ‘Install Now’.
When the install is complete click on ‘Activate’, you will then see the Vivid Child Theme as the active theme in your theme panel.
Underneath the Dashboard item in your left hand menu you will see the menu item 'Vivid by Divi Soup' hover over it and the click on 'Easy Demo Import'.
Leave all the boxes ticked and click the blue 'Import Demo Content' button
When the import is complete you should see this screen:
Now check the front end of your site and you should see it looks just like the demo, but with placeholder images.