Hello Kenneth,

This error appears when you try to install one version of WebSite X5 with a licence intended for another version. Make sure you are not entering the licence key in the demo version.  If you still have the demo version installed then uninstall it completely before installing the full version.

The FULL version setup file can be downloaded here:

https://answers.websitex5.com/profile/downloads

You can verify the correct licence keys here:

https://answers.websitex5.com/profile/licence

Kind regards,

Paul