In Mac OS 10.6.6 Click on the link "microwing.zip" and you can follow it in Safari's (5.0.3) "download" window you can see the progress. When it is all loaded, it automatically unzips into a folder called "microwing" on your hard disk. Drag that folder into the "Aircraft" folder of AF5 (5.5.0.7). I just did that in about a couple of minutes and it shows up in the plane menu to use.