Hi Jim,
When you get to 2020.net login and go to the manufacturer updates. On the manufacturer updates page click on view all manufacturer updates. This will show you all the catalogs available for download from the site and THERMADOR is down near the bottom of the list. (Alphabetically anyway 🙂 )
From there click on the blue download link and on the page that comes up click on the download button to download the .zip file to your computer. Once that download is done you just need to use the catalog manager to install the catalog into the program.
Or if you don’t want all that bother, Log in to the cloud browser in version 11.4 or higher and select Thermador from the list. 🙂
Neil