Demo help plz?

[Oxx44]

ok so I am trying to download the demo. But every version I try win rar shows invalid file can't un rar. Am I doing something wrong? I am more than willing to pay for the full version because my jukebox cab is almost complete. But I want to make sure it will run correctly first.

I'm using win xp.
Thanks for any help you can provide.

[Barcrest]

I can't email it to you because it's too big. What size is the rar file when you download it? Try it with another browser.