The search for a is a search for a ghost. Such a file does not exist in the way you hope. At best, it leads to dead ends and frustration. At worst, it leads to identity theft, ransomware, and the complete compromise of your digital life.
If you're hesitant to use an activator, there are alternative solutions: Microsoft Office 2013 Activator Txt
If you suspect you have already used one of these files, act immediately: The search for a is a search for a ghost