1. Download the file (I reccomend that you download it to your desktop) and unzip it.

2. Navigate to the text document that has the airports ICAO code in it (i.e. KATL1) and drag it on to the icon of the installer program (available here). A window should come up saying the file was successfully installed. That's it!

Keep in mind, the AFCAD files I provide DO NOT ALTER VISUAL SCENERY. The files provide a roadmap for AI traffic, that tells them where to park and taxi. In some cases, I will acitvate taxiways that were previously unavailable to AI, I can activate runways which were previously unavailable to AI, I can add parking spaces and gates, which lets you have more AI traffic, and, if need be, I can add arrival, departure, tower, ground, etc. frequencies. But the files do not alter visual scenery, only the "scenery" that is the backbone of AI traffic in FS2002.