it all depends on your roll back preference.
do you roll back a lot ? is there a specific version of sonar you like to use (a specific update)
if so then keep that one.
if you are fine with the latest version you are using, delete all other versions of Sonar.
as an insurance policy I would keep the previous update along with the most recent.
when you think about it, the worst that's going to happen is CCC will re download the version.
1- go to C\ProgramData\Cakewalk\CommandCenter\Downloads
2- Locate versions that begin with:
SONAR Platinum Setup3- purge as needed.
FYI- I did this myself a few days ago.