NOTES ON DESIGNING A GOOD THANK YOU PAGE:
Place the text $defenderlinks where you want Download Defender to insert your product download links.
If you use CSS, the <a> tags created by Download Defender will have a class of "defenderlink" for style purposes.
Using full urls (http://) for your images will make it easier to move your scripts around and give you realistic previews in the Download Defender configuration utility.
On the thank you page, you should let your customer know how long the links will be active, and how to contact you in case there is a problem.