by hronmeer » Sun Apr 26, 2009 8:58 pm
As far as I know, the only method you have for updating it is to download the latest release, and run the update. I've always done a clean install, though, so I can't speak on how well the update runs, and I have no idea how well it would work trying to update from a version 4 releases back. I also know that with Fedora 9, they made available a new app called Preupgrade, which will download only what is necessary to upgrade to the latest release, without needing the entire installation disc, but I don't know if it will work with FC 6, especially since Preupgrade is downloaded from YUM.
You're probably going to be best off backing up all your data to an external drive, and then using the latest release to either upgrade or run a clean install.