Jerry,
All I did was,
(1) download the Cepstral file,
(2) open the file (which installed it),
(3) I had to exit Hal because it didn't show up (like you're experienceing) and I may have done a computer restart just to let everything sort (I've always done restarts, it's just something I do),
(4) go to the character setting of the general options screen,
(5) push the Update SAPI config which displays the available HapSAPI test-to-speech engines,
(6) scroll down the list and the Cepstral voices were at the bottom of the list,
(7) select the voice and push the "make this my default SAPI setup" on the bottom of the HapSAPI setup screen and bingo...everything works.
[
]Daireaux