You can download the B2TR at http://www.microsoft.com/downloads/results.aspx?pocId=4289AE77-4CBA-4A75-86F3-9FF96F68E491&freetext=2007officebeta2tr&displaylang=en . Just check from the list of available downloads what you need and download it directly.
If you want to download the ‘Save as PDF or XPS’ add-in, your office 2007 installation will need to be verified, just follow the instructions.
Also, make sure you read the installation instructions before upgrading your current Beta 2 installation!
Click here for the Sharepoint team’s blogpost on how to install the B2TR.