TechTool Pro 8 is available as a download only, and is not available as a bootable DVD. If you need a physical backup disk, you may download the installer dmg and burn a copy, or you can purchase the TechTool Pro DVD, which contains the installer.

For those tests and tools which require starting up from a different startup disk, it is recommended that users create and use an eDrive.

Here are instructions for creating an eDrive.