I have no such option when I run the install program. If I select custom install, all it will do it ask me which partition I want to use for the install. After that selection is made, there is no other option, the installation begins.
I am using build 7100 RC on an X58 Gigabyte mobo. Users of this board seem to have a problem getting NIC to work. I don't know if any ever do. But I figured someone here must know some way to make it work. All I have done so far is installed the drivers of the GB disk. In experimenting...