[CM] Grace 3.6.0 won't start (OSX 10.4)

[Dudley Brooks]

I just downloaded Grace 3.6.0 for OSX and it won't start: the icon 
starts to show up in the dock, and then disappears.

I didn't see any System Requirements page on the website.  Can it be 
that 2.6.0 is only for 10.6?  If so, which earlier version runs under 
10.4 (10.4.11)?  If not, what else might be wrong?

I also downloaded CM 3.6.0.