They should be called, "free download pages" or somesuch. You don't have to swap anything for the files there.

They are divided up into flying sites, planes, and paintjobs. Look through them and you might find a flying site that you'd like to install into your G5 on your pc so you can fly it in your sim. You might find a model that you don't have and would like. No cost to you. Free. And as you might have seen, there are hundreds and hundreds of the planes and lots of fields.