Hello
I'm not sure if this will help but I saw this message from Medeksza to a user (Solvostond) asking a similar question than you
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There is a page setup at
www.zabaware.com/assistant/redownload.html to resend download links.
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You will find the message under FORUM Ultra Hal Assistant Beta "Unable to download full version of 5.0"
It is said that if you go there and enter your email address. You should received a new download link.

Maybe this helps? I had a similar problem myself before receiving the CD, and I just re-bought Hal as I did not know you could redownload it.
Best wishes
Patricia