Painter IX demo doesn't work

I downloaded the Painter 9.5 demo and get the error message upon starting:
"This copy of Painter has been damaged or illegally modified. Please reinstall from disk"

I redownloaded, and tried on a different computer and still get the same message. Has anyone else had this problem? - Andrew

Try: turn off antivirus and download the program again.

Thanks, I tried that and it still won't work.
Still get the error message.
Oh well !
- AF