MAc 4.3.4 Installer Error

Hi!

I downloaded the 4.3.4 Mac Cataclysm Installer here, but everytime i get a error by launching

Assertion Failed!

App: /Users/Martin/Downloads/Warmane-Mac-Cata 2/World of Warcraft.app
File: /Users/patchman/buildserver/wow-b/work/WoW-code/branches/wow-patch-4_3_4-branch/WoW/Source/Mac/../Client.cpp
Line: 3623
Error Code: 0x00000002
Time: 2016-12-18 09.12.18 MEZ

Assertion: file: signaturefile
Crashed Thread: 0x0000050b

I got enough disk space left, but i dont know how to correct the error, i can post the whole report on request

pls help me LG