Hello 
I can`t to use demo-version this programm, help me please
Im try and try again, but dont worked 
That’s very little information to go on. We really need to know at what stage it is not working.
Was the download OK?
Did you get the license key in your e-mail?
Did it install at all or hang during the installation?
If it installed correctly, what happens when you run Rhino exactly? Crash while opening? Black viewports? Something else?