Login to the Plesk control Panel
Once logged in click on “Applications” tab on the top.
From the Applications screen you can install many popular applications including WordPress, Joomla and Drupal.
Now click on “All Available Applications” on the left hand side
In the Application search window type “oscommerce” click on search button and see the search results
Now click on Install button in order to install Oscommerce.
The next screen will show you the installation progress, where we can see when the installation is complete.