You can't download preset curves in the TUNE+, but the preset curves in the site can be read with the TUNE USB software: http://www.123ignition.nl/downloads/software/123Tune/Setup123Tune_v1.8.4.exe
The preset curves available you'll find here: https://www.123ignitionshop.com/gb/content/11-123tune-curves-download-page.
Please select the file needed and save it. Now open the TUNE software and import the saved file.
The curve for the VW Beetle will be available any moment now.