1) Kindly sign in to the Plesk control Panel.
2) After you log in the control Panel click “Applications” tab.
3) Now from the Application, one can install numerous popular applications including WordPress, Drupal and Joomla.
4) After this click over “All Available Applications” on that is on the left side.
5) In the search window for Application type “osCommerce” click search and view the results.
6) To install osCommerce click on Install button.
7) You will now see the installation progress on the next screen, and then you will see the installation complete.