Customer digital download problems - WordPress

I have a digital product I am selling. I have the website ready. I have the clickbank monetary transfer set up. Once a customer clicks to BUY the product, the payment is processed and they are sent to my Thank-You page. How do I give them access to the 264 files they have purchased? I don't know how to allow them to download these files to their computer. I have used WordPress (OptimizePress Theme) to set up the website and the thank-you page. They are ready to go. The files I am trying to allow the customer to download are: 4 PDF documents 130 high quality video files in one folder 130 lower quality videos in one folder