Not an easy answer, and i'll tell you why. Most of the extensions i've seen, tried and read all seem to have a problem with the ipn talk back from paypal. Supposedly ijoomla's digistore has a problem with it and so does virtuemart. I've got a site going live soon that will be offering a script for sale, 2 versions of it. I need a script that will allow a user to log in, buy, and then be redirected back to the site to a download page with the script ready to go. Any ideas?