refresh at lostpassword doesn't work when installed in mu-plugins

It appears, when SI Captcha is installed in mu-plugins, the refresh feature on the lostpassword page doesn’t work due to the incorrect path of si_captcha.js.

To fix the problem, replace the first 2 lines of function si_captcha_login_head() in file si-captcha.php with these lines:

global $si_captcha_opt, $si_captcha_url;
  echo '<script type="text/javascript" src="'.$si_captcha_url.'/si_captcha.js?ver='.time().'"></script>'."\n";

https://www.ads-software.com/plugins/si-captcha-for-wordpress/