This is how we did it last year… I just copied this from the website we’re we learned about itwhere did you find the download option?
You do have the option to purchase your PhotoPass photos individually if you did not opt to add Memory Maker or PhotoPass Downloads during your Walt Disney World vacation. Head to the Walt Disney World website, hover over the "My Disney Experience" tab at the top right of the page and then click on "My Photos". This will bring up all of the PhotoPass photos you have taken on your vacation. Scroll to the one you would like to purchase and click on it. You will have the option to purchase individual photos directly from your desired photo.