No, just follow the instructions in the last post about changing out of the CD directory ( ie press return from the window from which you launched the installer several times so that you get a prompt, make sure you're the same user that launched it, for which you may have to exit out through the shells, and change to something like /tmp.) Then you will be able to eject the CD and switch it, and then continue with the installation . I did all of this myself last week.

Jo.