Press on "buy now" or on "add to cart" (if you want to buy more items: discounts are available if you reach 16$).
You will be brought to Paypal. After the payment click the button on Paypal that will bring you back to the seller's site (don't press the back-button on the browser).
You will be sent to a page containing the download links. Now your file(s) are ready to be downloaded.
Be sure and check the email that you have associated with PayPal. The link for the downloads will be sent to your mail too.
You still cannot download the files? Write me or Aimee.