Airport Addons include products from Aerosoft, Mexsim, UK2000 and various freeware. All are installed on top of Horizon Simulation‘s VFR UK Photographic Scenery version 3.0
Although the Google Earth data file can be downloaded directly from the following link, it is recommended to just COPY the URL to the Network Link in Google Earth instead. This not only saves harddisk space but also allows realtime changes when airports for the map are updated.
Just in case, here’s the Post 64 about Adding Network Link to Google Earth.