The file has been in use since 2008 with hundreds of downloads, so I don't think there is any issue with the file.

At least you are on the right track now.

Either your PC does not work with this install CD or your original download was corrupted.

In the same directory as the Iso files we also have an md5sum file, this is used to confirm the file you downloaded is not corrupt.

Google md5sum to see how it works and check your download is ok.

Peter.