Need Invisible Digital Host

Hi everyone.

I posted in another thread but I'm starting a new one as I've got a better idea of what I'm looking for now.

I have a website and a shopping cart. It's all Wordpress. The cart was created in such a way that is uses the Wordpress posting pages. It is not a plug-in cart. It's part of my wordpress site.

The buy buttons on my site are also a part of my "cart." I can't change them. They connect to Paypal.

I want to offer digital products through my site. I've got an ebook on there that's stored in my media library, and the page with the download link is made private. When someone buys the ebook they are taken to Paypal to complete the purchase, and then they are taken to the private page with the download link on my website.

I have a larger program I want to offer, and I've been told that I can't store it in the media library through my site because it's got too many components and it's too big. So, I'm looking into other options.

I need something where buyers won't see where the files are being downloaded from. In other words, after they complete their purchase at paypal, I don't want them to know they're getting the product from e-junkie, payloadz, or name your software. I want them to be taken back to my site, and receive the download through my site.

Is there a software platform that would store my product and send it through a link on my site after payment is made?

I don't want to confuse my customers and I want everything to coincide with my branding.

Thanks!

PS: My product consists of audios and downloadable pdf's. I'd like to include video in the future.