WoW nor working on my Mac

Hy Community

I bought a mac and wanted to continue playing warmane wow on it.
I downloaded now booth clients. The one with the new models and the old one.

But always when I want open WoW, it just tells me:World of Warcraft can't be opened.

Just as info:
My mac is a macbook pro, mid 2015, 2,5 ghz i7 with the radeon m370x graphic card.
And im running mac os 10.12 sierra on it.

I hope you can help me. Maybe I just forgot something. It's my first mac again since around 5 years, so I need again a bit time to get used to it;-)