Change link of the logo.

you can do that via filter in your child-theme functions.php:

add_filter('avf_logo_link','av_change_logo_link');
function av_change_logo_link($link){
    $link = "https://kriesi.at";
    return $link;
}

_____________________
by the way: there are a few filters to manipulate the logo:

function avf_change_logo_title($title) {
   $title = "The new Title is here";
   return $title;     
}
add_filter('avf_logo_title', 'avf_change_logo_title');

function avf_change_logo_alt($alt) {
   $alt = "New Alternate Text Here";
   return $alt;     
}
add_filter('avf_logo_alt', 'avf_change_logo_alt');

function avia_new_logo_tag(){
    $output = "div";
return $output; 
}
add_filter('avf_logo_headline','avia_new_logo_tag');

see: https://kriesi.at/documentation/enfold/logo/#customization