Well, it looks as though something somehow became corrupted in the .zip files. I just downloaded both files again and burned them to disk, one using Roxio and the other using Nero. Neither of them is recognized by my NAV system. So...

I am creating ISO images of each and will test those. If these work I'll correct the links in the original post and you'll be able to download the ISO images instead, and both Roxio and Nero will know how to handle the format.

Stay tuned.