I raised this question raised in "This is "audio" program right?"
thread, but am afraid that it will get lost in long thread, and would
like to know the answer.
Part of the problems that newcomers have seem to be connected to demo
behavior sometimes, so maybe it would be nice if someone from Cycling
explained the exact situation.
I seem to remember that during demo period MSP DSP can be activated
only once per restart. I'm quite sure that this was the case some
time ago. Also, Mac and PC demo versions differ slightly - on PC you
have to click "demo" every time you want to open new patch and on Mac
only when you start the program.