Did you try following the Wordpress Site Shaper Video Tutorial
A Site Shaper cannot be installed through the Wordpress admin area; the zip has to be extracted & uploaded to the root of where you would like your Wordpress installation to be hosted. You also have to have an empty database in order to run the installation.
If you already have WP installed, you need to go to the database manager for your domain (usually phpMyAdmin), drop all the tables in your database, and delete everything in your site directory except for wp-config.php.
At that point, upload the contents of the site shaper to your site and navigate to the site in your browser; You will see the standard WP installer. Follow the instructions of the installer, and on the final page of the installation process, make sure you select the "Install Sample Data" checkbox.
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