ORIGINAL: cmstone
I am having the same issue as Eric. I redownloaded it several time to be sure it wasn't a bad install. I also have restarted my PC, and have tried to install while G4 was running. No luck. Any suggestions? ( Running Visa )
Each addon, 1 and 2, is downloaded as a zip folder. I don't know how Vista works, but with the previous operating systems you simply unzip zip folders. These have a file within that you simply move into the folder as instructed. That folder is usually "C:\Program Files\RealFlightG4\Data" That's all you do. The file is seen and understood by the simulator as is.
If you've moved the dck file into the \Data\ folder and your G4 does not see it there, then you simply need to update your G4 with a more recent update/version.