Go to the Targetware site and download the TW installer. When you start it don't be surprised when it starts installing the latest updates automatically.
To download Richthofen's Skies, go to "Mods" - select "Richthofen's Skies" and then click download! Now you'll be able to go to the server(s) and play!
I'm not sure how much good it will do, but I'm uploading the 48 MB package to my webspace for fast download (downloading from the main server isn't bad at all, but it isn't the best). I have plenty of bandwidth, since this site is technically not up yet (I'm also not that popular, which makes it ideal for bandwidth in a time of need).
Good luck! I always have trouble getting off the ground in Targetware. (Maybe it's because I don't read directions!). I was never able to get the Camel off the ground, but I succeeded with the Fokker Dr. 1 by doing this (more or less):
2. Hold Shift+'
4. Pull joystick back to get better control (it tends to zigzag all over the place on the ground).
5. Push space again if you aren't airborne.
6. Have fun!
Sure it needs some work, but it looks promising. Better than nothing!