Hi Ismael,
I have seen the post but the pastebin link is expired and this is why I have asked the same question again.

You need to set featured images for all pages then edit includes > loop-search.php. Remove everything and replace it with this: http://pastebin.com/pbp2z3x2

PS. Generally I find everything what I’m looking for – good support!
Regards
G_T_M