This Premium WPShopCart turned out to be pretty much exactly what I needed to have my digital files paid for by clients, and then delivered quickly and efficiently.
I was able to set up 90% of what I needed by myself, and then I paid a little extra to Niaz to quickly help me customize a couple final but important steps that I wanted done.
I was also able to speak to Niaz on the phone just to make sure he knew exactly what I was after, and then between a few e-mails over 20 minutes or so back and forth, everything was sorted. Beautiful!
Also, I should make a point to mention that it does deliver large files via Amazon S3 as well if that is what you are looking for.
Without putting anyone through my sales funnel, you are welcome to look at my final sales page that I change around pretty often with different specials, and click the "Add to Cart" and input one of the coupon codes if you want to see a working example. Niaz helped customize this a little for me the way I wanted it.