Nobody can tell you anything without proper system info or other technical details. That aside, I'm sure you'll get better answers from RG support regarding specific compatibility issues.
Well I checked the compatibility and everything is compatible.
Here is the exact error:
After Effects Warning: The following programs have failed to load. Reinstall these programs:
C:\Program Files\Adobe\Common\Plug-ins\7.0\MediaCore\Magic Bullet Colorista\Colorista-III.aex
Make sure your Red Giant programs are up to date and properly installed. You may need to use the Red Giant installer to remove the old versions and re-install the new ones.