I think you may need to download and install the latest version of the AIMEngine.
click here for the installation file (this is a 'Preview TinyURL' - click on 'Proceed to this site' to download the executable file).
According to their support site, the installer messages are in German but the AIMEngine itself is compatible with the English version of RedShift. It installed and worked dependably on their test computers. RedShift 5 uses the AIMEngine to show the Help Manual, the AstroDictionary and the PhotoGallery.
More support assistance available from the developers' webite - click here for details
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