Hi Jeff,
I found a way to get it working without downloading the zip.file again.
You just have to compress the 3 files again and use stuffit expander to decompress them again.
This worked for me.
I have the same problem.
Downloaded 3 times with the same error message.
Now I am not able to download it again and using stuffit this time.
I wrote a support ticket and hope that the download will be activated again soon.