digivendor pro install fix(repost)

My Web site is [login to view URL], i recently had a redesign done on the page that is very good ,but the software had a? glitch? and the developer sent me the new files but when i install them they revert the site back to the old layout. I need someone who can? integrate? the new design with the new files. the new file are to fix problem with the cart system on the website.