какая есть альтернатива

No image/thumbnail showing

Make sure that the wpxtube directory in the wp-content/plugins/ have the correct permission of 755. Some hosting providers set restriction if a direction doesn’t have a correct permission
Check that the wp-content/wpt_cache directory have the correct permission of 777
Look into the wp-content/wpt_cache and see if there are sub-directories containing images: if not, you should restart downloading all images by clicking on the button Download All Thumbs in the feeds menu.
Check that the following file wp-content/wpt_cache/.htaccess is present
Make sure that mod_rewrite module is installed in your server
if you are not using Apache or you don’t have mod_rewrite, you have to disable the permalink thumbs in the wpXtube setting menu