Upgrading 4.0.1

[Nathan Cashion]

It seems that the ISOs are available from the YellowDog website mirrors
now, although I haven't seen anything posted regarding this yet.
http://mirror.mcs.anl.gov/yellowdog/iso/
Are the yellowdog-4.0.1-orion-20050208-install.iso files for real?

How do I go about installing the newer version?  Is there a way to just
upgrade to 4.0.1 or do I have to do a complete install from the CDs?

Thanks,
Nately