Hi,
could you please replace the user agent defintion in curl_exec_follow (class_core.php) with a more recently ? e.g.
Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36
Some websites and services (like epapers) return invalid...