WordPress 404 cannot be found error when linking to envato theme via FTP

Solution:

If you are looking for the URL of the page you gave it is actually: http://ldnapprenticeships.co.uk/wp-content/themes/uncode/library/css/

var/www/vhosts/ldnapprenticeships.co.uk/httpdocs/wp-content/themes/uncode/library/css/
is the server path.