Stupid techy question about a OTO

That's where the superficial WP fans ("oh, it's so easy, I use WP for EVERYTHING") who know nothing about WP will not come to rescue you.

Honestly, I think you are using the wrong tool for what you want to achieve. I can do anything with WP... but for such a task I would just use a simple HTML sales page+paypal button. Then in PP you can define (during the button creation) WHERE to send (URL) the buyer after the succesful payment. It should be either:
- your download page
or
- your OTO (although even on this one you should have a link to the dl page for those that skip the offer)

If they buy the OTO - which should have its own buy-now PP button... you redirect them after payment to a "double download" page, i.e. where they can download both the frontend product and the OTO.

Basically, you need 4 html files:
sales page
download (dl) page
OTO page
double download page

(and with WP you'll make it more complicated than it ought to be)

Of course, all the above is just the basic schema of the funnel. We did NOt adress the security: how will you protect your download page/link from unauthorized downloads.

Thanks Istvan--some very valuable info there!

anyone else?