Pre Sales Question – Paypal Standard Buy Now Button and affiliate Tracking?

Is there any email support for pre-sales? I’m trying to find out if the Pro version of this plugin will work for this scenario:

Affiliate sends traffic to my merchant site with tracking cookie, hits buy now button processed with paypal standard (which is set up with affiliate tracking script) – Buyer returns to my Merchant site Thankyou/success page with Login Details for protected download (the buyer and affiliate tracking data is sent back to this affiliate tracked thankyou page) Sale is tracked to affiliate.

thanks
Paul