as far as i know the option of a custom installation is only available in the catalyst software suite. you have to download dd & ccc separately, not the catalyst software suite and then only install them separately using custom install. scroll down to "Option 2 - Individual Downloads" on the download page and download display driver & catalyst control center there. then extract both to the default location C:\ATI\Support... and break the installation up after having extracted them. then modify the files in the dd folder, install dd, DO NOT RESTART in between, install ccc, and finally restart.