As regards being unable to download, it is just a Dropbox page so should be pretty universally accessible. I split the Mass into 34 parts or so; you can listen to selected ones or download a zip file of them all. Each file is MP3 so if you are not set up to play MP3 files you will presumably have an issue.
The ordinary of the Mass is Byrd's Mass for Four Voices (except the Credo, which they will probably add for Christmas this year) and I thought the choir did a good job.