There are a lot of posts on this subject. Chaplain Kent provided a lot of pictures and a good write-up. I have replaced the seals on one window so far and found that it was a lot easier than I was expecting.
Seals are available from various sources. I don't know if the Argosy motorhomes used the same bottom track guide that the Classic motorhomes use. If so those track guides are no longer available. My tracks were marginal but I think I can make due with what I have.
In a nutshell what you have to do is drill out the rivets on the aluminum trim frame that on the inside of the coach. Pry out the screens and then the windows. You might have to remove the bottom track guide and the top track guide before you can get the windows out. Once the windows are out you dig out the old window seal and then replace it with a new one using weather strip adhesive from 3M to glue the new seal in place.
I have yet to figure out how to do the little fuzzy dust strips but will get to that one of these years
Good luck and keep us posted on your progress.