How to install WoW free

Hey I once played WoW when I was younger. Now I would like to play it again without spending any money on it though. Can anyone give me advice of how to install WoW, or show me some website with the equivalent download files? I don't have any Wow files on my Macbook. I want to play on a Wrath of the Lich King patch. I have seen the download links on Warmane's website but since those are just expansions I figured that I need more than that. Burning Crusade was the first as I can remember,
Thanks in advance :)

no, you need only what you see here: https://www.warmane.com/download
WoW does not requires any instalaltion, it is just a folder, click on WoW.exe and you will play

Thank you, I have installed it BUT I cannot open it. When I click on any of the WoW buttons, it says my finder can't open it. Do you know or does anyone know why this is?