Jquery NoConflict Problem

Try and call method `prettyPhoto’ when DOM is ready, replace your code:

jQuery.noConflict()

jQuery(function(){
  jQuery("a[rel^='prettyPhoto']").prettyPhoto();
});

with this:

jQuery(document).ready(function($) {
    $("a[rel^='prettyPhoto']").prettyPhoto();
});

Also ‘Paid Downloads’ plugins enqueues latest version of jQuery used by WordPress it’s 1.6.1, it would be better if you register same version of jQuery from Google-CDN as WordPress does