hm... I recently changed sleep timer to lower value. When timer was set to 1 second , downloading was really slow, so I changed it .. then it was faster , but only part of patch was downloaded. Can it cause a problem ?
EDIT:// I set timer to default (1sec) still not working , so I am gonna try modify WoW.exe
I have modified wow.exe , still not working ... my WoW is not installed , it´s only portable , so maybe it can´t find path to my Data folder.