Nostalrius Begins - Quality wow vanilla realm (1.12)

I've been trying all day to download your client, from the website, however when I finsh downloading it no matter what type of Os im using (OSX is my pref , but i am on windows at the moment). I get that the files are corrupted. Please help.

DL with browser or programm?

I got it work, I had to change my DL directory. I had to take it off my external HD.