How to create installer for flash app where content is distributed by chapter?

hi everyone,

i wanted to create an application installer (per chapter) like the one implemented on the product on this site: http://www.thelandofme.com/ .. can someone pls guide me on this? i have no problem creating flash apps but i'm so lost on making installers , like update installers for the same app.. the idea is that on first installation of my app, other contents are not available until the user downloads it from my site and install it on their pc. and that installer will just update the existing one with the new downloaded content..

i hope i have explained the idea clearly.. i need a guide or advices on how i can make an app like this..

thanks in advance.

-irene