Hello Rhys - I don't recall any probs with it, but that was a long time ago. The most likely trap is the path to your FSX. If you don't specify it, or make a typo, the configurator will look in the default location, and if you have installed your FSX to a custom location, it can't change anything. My own FSX installation was to a folder named FS10.
If you read the VLCConfig.config.xml you can see what each bit does, and where it is looking. There is also a vlcconfig.log file. These are in the main VectorLandClass folder.
The pdf says to simply choose your settings, apply then exit and then make a flight. Not sure now if the flight is necessary to set the changes in place, but it might be.
Hope this helps
'Propliner' is actually short for 'Proper airliner, with big rumbly radials'