You can also download an ISO image and use it to create a bootable DVD or USB flash drive to install Windows 8 Release Preview. If you install via an installation media, you’ll need to enter this product key: TK8TP-9JN6P-7X7WW-RFFTV-B7QPF.
Once Windows 8 Release Preview is downloaded, you need to choose how and when to install it. You can install on the current drive or you can make an ISO or bootable flash drive for installing Windows 8 Release Preview on another partition, virtual machine, or another PC.
Before the installation begins, the setup will inform you of the programs that would need to be attended to, post the presentation.