This thank you page is designed to make thanking your customers clean and simple. Get them what they purchased and possibly give them an upsell.
This secion reminds them what they purchased from you. It encourages them to get excited about what they just purchased and also gives them a quick and easy way to download the item once you hit on a few main points.
Now that you have explained everything there is to know about the offer they purchased its time to give them a link to the goods.