Wordpress theme install

I am currently running Wordpress 2.9.1 and don't want to upgrade. I have purchased a theme from <[login to view URL]>? and I am unable to make it work like it is suppose too. I know it's got to be a chmod issue but just need this looking like the design is on the demo and i can go from there. Demo link <[login to view URL]>? from top to bottom easy and simple install. Once excepted the zip file to pull into the system will be provided. This is a legal copy purchased today. So I need this finished asap.