As of the October 2018 release of After Effects CC (version 16.0), the Synthetic Aperture Color Finesse plug-in is no longer bundled with After Effects.
This is noted (towards the bottom) along with other new features and enhancements, here:
https://helpx.adobe.com/after-effects/using/whats-new.html
Color Finesse was first distributed with After Effects 6.5 in 2004. It helped fill a gap in the After Effects toolset, specifically a comprehensive set of color grading tools, including a vectorscope and waveform monitor.
More recently, After Effects has integrated the Lumetri Color effect (November 2015) and the Lumetri Scopes panel (April 2017) from Premiere Pro, which enable color grading and monitoring within the After Effects user interface, without needing to open a separate window.
The Color Finesse plug-in is still available from Synthetic Aperture.
https://www.syntheticaperture.com/
Without the Color Finesse plug-in, projects created with it in earlier versions of After Effects will not render as expected in After Effects 16.0. I recommend that you complete such projects in the earlier version, or switch to using the Lumetri Color effect.