No need to keep them in their default location. If you have more room on another drive, move them over there. Or leave them on an external drive or DVD backup. If you ever need to re-install, those installers can be run from any location.
If you think you might ever run CCC again, configure it to save any future downloads to the new location. (Click on the gear icon, then the Paths tab, and type the new location into the "Download Path" textbox.)
There are other ways to free up space on your SSD, such as moving the Windows paging device to another drive and moving SONAR-related sample folders (e.g. Dimension Pro, Studio Instruments) elsewhere. I freed up 12 GB from my C: drive doing the latter.