Nostalrius Begins - Quality wow vanilla realm (1.12)

Hi, having some trouble extracting after downloading the installer from mega, i keep getting an error message that claims the file is invalid or corrupted. Retried downloading several times with no difference in outcome. Any ideas what im doing wrong or advice for me please?

I also encountered this exact same problem. Can anyone help us?

Search for different downloads of the client, it doesnt have to be this one. Any 1.12.1 client will do.