If I were you, first I'd put the tar.gz file into a temporary directory, on the server, and see if it will unzip ok before download...
I've tried unzipping the file with software, and then I tried using Terminal in Mac OS X
Really?! Software?! No way!.
Terminal is cool though.
...then I'd describe precisely what I was doing to produce the error messages.
My money is on incomplete file, or operator error.
You are welcome to a refund.-Michael;Comparing 'DH of today' with 'DH of old' does not serve much purpose.-Dallas