The swap pages can be notoriously hard to search. Try short generic parts of a possible description, like EDF, Viper or Avanti. You may have to kiss a lot of frogs before finding your prince.
The 3 types are:
EA - Entire Aircraft. Takes the most time and skill to make. Made from scratch by the contributor.
CS - Color scheme. A repaint of an existing either stock RF plane, or of an EA. Pretty easy to do, and there are bazzillions of them.
AV - Airplane Variants. Resized planes and/or changed flight physics. May include a new color scheme. Requires a base stock or EA plane. Some use what may be a very different starting plane, and then heavily changed to fly like the one they are named after, even if they don't quite look like them. Some are just tweaked to fly the way the person making them thinks they should fly. Results vary from fantastic duplicates, to really poor....
CS's and AV's will indicate what their base plane is, which has to be already installed first. If it was a stock RF plane, your version needs to have it. If based on an EA, the link shown will take you to that download.
Most versions of RF included almost all planes from earlier versions. They do not have planes from add-on or expansion packs that were sold in the past, however. Evolution does have almost everything, unless there were legal problems getting permission to continue offering it.
The version of RF the plane was made for may not matter at all. I just loaded an Evolution EA into RF8, and it works just like it does in Evolution.
Models made for early versions may not be as "pretty" or may not fly well due to changes in the physics engine over the decades, but can be adjusted to fly better if needed. I'm using a RF G3 plane in Evolution, just because.
For all the types, an "rfx" or "g3x" file will be downloaded, usually to your "Downloads" folder.
In RF, go to "Simulation", then "Import", then "Real Flight Archive".
Navigate to your downloads folder, select it and install.
At the bottom of the screen will be a message about it being imported (or not). Some messages may be due to minor things missing/failing, and it will still generate a model, although perhaps not quite right. If it fails completely here, and can't be found in the custom aircraft list, move on and try another plane.
Go to your aircraft listing, and find it as a "Custom Aircraft"
The first time, it will pause, saying it is generating a "DDS file". Usually there is no issue, and the plane appears on the runway. Fly it and see if it suits you.
There may be messages if something isn't right. Some errors can be ignored, although the plane that appears may not look quite right, but still fly. Others may make it fail to load at all. In which case, move on and try a different plane.