Restore unified paid download model

inc/core-hooks/part-2.php

@@ -476,6 +476,9 @@ add_filter('single_template', function ($template) {
     if (!($post instanceof WP_Post)) return $template;
     if (!function_exists('aksrt_is_resource_post')) return $template;
     if (!aksrt_is_resource_post($post)) return $template;
+    if (function_exists('aksrt_is_downloadable_content') && !aksrt_is_downloadable_content($post)) {
+        return $template;
+    }
     $candidate = locate_template(['single-aksrt_resource.php']);
     return $candidate ?: $template;
 });