Sorry you are having trouble.
I've tested the downloads and they are all working fine and unzipping.
Do you have enough disk space on your external hard drive? Maybe it is too large a file. Anyway, the file does unzip and nobody else has mentioned this to me besides you so I think it must be a problem with your hardware or something on your end there. If I was there I'd try to work it out with you but I can't since I am here. Can you unzip it to your local drive and then copy it to your external drive?
The reason for the passwords is to protect your investment and mine. The bandwidth for these bonuses costs much money when lots of people download; by using passwords I can change them when it appears on the black hat forums. It protects your investment because if everybody is getting it free, it wastes your money too.