Launching game ... please help me :)

Hello there, I've got a small problem with installing the game :)

I'm on Mac book.
I always use to play at global server but I miss Wotlk Expansion so I decided to start playing on this server.

I Dowload Wotlk from Warmane Site and when I try to open it window with error pops out:

https://ibb.co/hkVPzT

how to fix it?

I also have a few questions about that:

Do I need to download Classic client to run Wotlk?
Do I need to download TBC ?
There is no TBC on Mac, how to fix this problem?

iv been looking for solutions on the internet but couldn't find anything...
found something about Wineskin winery, would that help for TBC problem?

Theank you for any help !!

1. no, you do not need Classin client to run Wotlk
2. You need TBC client only if you wanan play on TBC realm

for your problem just download the client again, you can try from this direct download link if you do not like torrent: http://forum.warmane.com/showthread.php?t=280398

Just finished downloading, same error pops out.

can I download somewhere this Interface.MPQ???