I managed to change the code a bit to support ssl.
option.php replace
$this->myfiles=get_bloginfo('url').'/wp-content/plugins/'.$mydir;
with
$this->myfiles=($_SERVER["HTTPS"] == "on")? str_replace("http://", "https://", get_bloginfo('wpurl')) : get_bloginfo('wpurl');
$this->myfiles.='/wp-content/plugins/'.$mydir;