Get Puredyne one of two ways: (1) download and burn it on a CD or DVD, (2) download and create your own bootable USB stick.
Download the latest Puredyne version 9.11 - carrot and coriander - from one of these:
or by BitTorrent:
And here's our guide how to create a live CD/DVD for your PC or Mac.
(We are always looking for new mirrors - see this mailing list post and get in touch.)
You can also create your own bootable USB stick. It takes a bit of effort, but it's well worth it! Using the provided make-live-device.sh script you can easily create a liveUSB or liveHD directly from an existing ISO, or better, directly from Puredyne itself! Instructions here
PC ONLY: the current stick cannot boot on Mac (do you know why? tell us!)