HI J-
I can't say for sure whether or not the H910 will work on 10.6.8, but it very well might. Some of our plug-ins that use OpenGL (a rendering API) definitely do not work on 10.6.8, but the H910 should be ok on that front. That being said, the development and testing on the H910 plug-in has all been done on 10.7 or higher, and it's built against the 10.7 SDK. So while it could work, we can't officially support 10.6.8. Apple makes it very hard to provide backwards compatibility.
As gkellum mentioned, your best bet is to try out the trial version. It's pretty easy to set up and get going with, and that's the best way to determine compatibility with your specific system.
Best,
Tom
