Fix One Page checkout IWD Extension - Magento Version 1.9.0.1

General information for the website: We sell clothing accessories
Description of requirements/features: The add-on below in installed in the webpage, but is not working.
http://www.magentocommerce.com/magento-connect/one-page-checkout.html

1- Fix One Page checkout IWD Extension - Magento Version 1.9.0.1
2- Must work with Credit Cards, Bill me Later and Paypal
3- The buttons in the checkout must match with the webpage (grey/orange)
4- This must work in responsive design to can see in the webpages, tablets and cells
5 The security https:// must appears instead http:/ when start the CHECKOUT.
6- CDR Order Comments: Must have a line where the customers can let a messages in the checkout
(http://www.magentocommerce.com/magento-connect/cdr-order-comment.html)
Extra notes: