In your Themeforest profile, in the Download part, you can download the package of the theme you bought. When you’ll click on Download, you’ll see some options to get specifics files. We suggest you to click on All files & documentation. Then, unzip this file.
In Dashboard > Tools > Import click on “Install now” under the WordPress feature. It will help you to import the posts and pages of the demo with the files you downloaded. Once this feature is installed, click on “Run importer”.
Then, you’ll find the right file in the folder you downloaded previously. Go to Demos > the demo of your choice and select the .xml file to import. All the pages and posts should now be added on your website.