Sorry, I didn't see this the first time.
Anyway, I downloaded the qtextrafiles.zip file and extracted all the contents to the CartaGen folder. Where all the other files are. It asked to overwrite some files that where in there already, and I let it. Unfortunately it didn't work. I also tried running as an administrator, it still didn't work.
The error I'm getting now reads "The procedure entry point ?toLower@QString@@EHAA?AV1@XZ could not be located in the dynamic link library D:\Program Files\Cartagen-0.2.7-win64\cartagen\cartagen.exe."