There are several possible reasons for this message:
1. Previous installation found
Have you previously installed the Xara program on your system? You
only have one chance of trailing each version of each Xara product,
though note if you have access ...
The 15 day trial version provides you with the full functionality of
ScreenMaker 3D, but you are only able to preview your animation, you
cannot save it without purchasing the full version of the program.