Problem unzipping, please help :)

[Rudedawg]

I have gone to the link provided to me yesterday http://dofgame.com/download/Installer.zip

d/l'd the file.

I have Winrar 64 bit on my Windows 7 computer.

I have two files that came from the download : Second and Main.

I cannot get them to extract - I get the following error message:

The archive is either in unknown format or damaged.

I'm assuming it's not damaged - any thoughts on what I need to do?

Thanks!

Looking forward to seeing you all ingame!