While upgrading from 6.1 to 6.2, the installer hangs during the "create boot disk" operation. I have the updated BOOT (20000407) & UPDATES (20000419) disks from your errata site and have booted from them with "linux updates" at the boot prompt. If I check "skip boot disk creation" all procedes as it should. It's not a production server and I'll be installing a clean copy of 6.2 when I'm ready to make it a production server, but it's something someone will probably trip over. I'm not sure if additional information will help or not, let me know if it will.
When the install hangs, have you flipped over to the virtual consoles and seen if there were any error messages reported there? In addition, you might want to try text mode (by typing "text" at the boot prompt) and see if it does any better. I am guessing that you are getting a python exception when attempting to create the boot disk. As a workaround in the short-term, you can always finish the installation by skipping the boot disk creation, then run "mkbootdisk" on reboot to create your boot disk.
Closed due to inactivity.