So, as you say, it doesn't show up. Are you saying that in PT, it does not appear in the list of plugins/virtual instruments at all?
If so, it sounds like you need to re-scan your plugins. I do this as I install new plugins just to ensure that PT senses them and includes them in the list of plugins when it starts up.
There is a program that you can use to dump PT's preferences and re-scan at will that someone from the PT forum posted. I'll see if I can find that link in a bit later this morning.