Finally I myself found the solution ![Wink ;)]()
It might need some more coding, but firstly just delete this thread in the following files (attachment):
[code] if ($CONFIG['comment_captcha'] == 1 || $CONFIG['comment_captcha'] == 2 && !USER_ID) {
...

It might need some more coding, but firstly just delete this thread in the following files (attachment):
[code] if ($CONFIG['comment_captcha'] == 1 || $CONFIG['comment_captcha'] == 2 && !USER_ID) {
...