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 ...
You can download our trials on the Xara website  or, if you have
any difficulty with downloading the current versions from xara.com,
from download.com 
Either click on the Buy Now link in the start up screen of the Xara
3D Maker 7 trial or go directly to the website purchase page:
i. Click on the Buy Now button in the Upgrade section.
A 30 day trial is available to download  from our website.
The trial will run for 7 days without any registration required. In
order to increase the trial to 30 days, you will need to click on the
link from the starter panel to extend the trial. Th...
Please view the Xara 3D Maker 7 troubleshooter
* Installing the program
* Activating the program
* Extending the program trial.
The demo watermark remains fixed in the trial version of Xara 3D 6.
You can still change the color
or use a texture for the background but the background is always
overlaid with the watermark. Once you have purchased the watermark
will disappear. ...
Yes, the trial version of Xara 3D is available for free download. 
This demo is fully functional, although a limited set of samples are
provided. You can also find a 10 minute introductory movie on our
website at xara.com/Xara3D which is a good plac...