Ticket #14963: class-wp-upgrader.php.15659.diff

class-wp-upgrader.php

@@ -303 +303 @@
                 }
 
                 //Unzip's the file into a temporary directory
-                $working_dir = $this->unpack_package( $download );
+                if ( $package == $download )
+                        $delete_package = false; // local file, don't delete
+                else
+                        $delete_package = true; // remote file, delete local copy after extracting
+                $working_dir = $this->unpack_package( $download, $delete_package );
                 if ( is_wp_error($working_dir) ) {
                         $this->skin->error($working_dir);
                         $this->skin->after();