Nickr92922376 and Mariam Hovhannessian to remove the current trial installations of Illustrator CC please follow the steps listed in Uninstall or remove Creative Cloud apps .
You will also want to use the same steps to remove any other installed Adobe software. As part of the Illustrator CC installation process updated licensing and update components are installed. To revert to the version fully compatible with Creative Suite 6 please remove any currently installed Adobe software.
Once all software has been removed you can then download a new copy of the installation files from Download Adobe Creative Suite 6 applications . For information on how to locate your registered serial number see Find your serial number .
Nickr92922376 and Mariam please update this discussion if you have any additional questions on how to reinstall Illustrator CS6.