You can modify the file framework/functions/thumbnail-functions.php file at line number 111 to –
$post_type = get_post_type($post_id);
if ($post_type === 'portfolio')
$post_link = "http://clinicsoft.atomicstudio.io/solutions/";
else
$post_link = get_permalink($post_id);
This won’t remove the lightbox though. If you need to remove the lightbox, you need the following custom CSS in the Custom CSS tab in theme options –
.type-portfolio .image-info .image-info-buttons { display: none; }