It is my understanding that SSP users will receive the CD, this is an upgrade, not an update. Here is the link for
Circuit Design Suite 10.1, from that page you can download the readme, the release notes and the installer to let it run in eval mode. To download the software use the "Download the current evaluation software" link, that will take you to the guestbook.
If you have SSP, your serial number will be later on assigned to 10.1, you will be able to use the same serial number to activate 10.1. It is possible that since it was just released SSP serial number are in the process of being reassigned to the new version.
Nestor