hmm... I'll give it a try...
The install guide says
"Some payment modules, such as osCommerce PayPal IPN module, bypass checkout_process.php, which causes the modification skipped and fails this contribution. Modification in checkout_process.php must be manually coded into such payment modules."
Does anyone know
1) How to modify paypal IPN modules so that they work
or
2) which paypal payment modules work with super download shop with no modifications?