QTPro Contribution Install

I require someone experienced with OSCommerce to install QTPro version 4.51b onto a HEAVILY modified OSCommerce Store. The store you will be installing onto is live, so all work needs to be backed up and downtime kept to a minimum. The link for the contribution which needs installing is here; [login to view URL] The site it will be installed onto is at [login to view URL] Once the work is complete I would also like the product attributes to be displaying in alphabetical or numerical order to the customer, in the dropdown list. If a product size runs out of stock for example, it should not be available for customers to purchase.