Tested: opencart 1.4.7
Upload and Replace the file home.php to catalog/controller/common/
Upload and Replace the file cart.php to catalog/controller/module
Upload the file OPC032n.png to /image/templates
Upload the folder OPC032n to yourpath/catalog/view/theme
Login to your admin area.
Navigate to System-Settings-Store-Template and select the OPC032n.
In the same admin area go to Extensions-Modules.
Click the Edit button on all modules that have the position set to Right and change it to Left.