AEC import for AfterEffects not working

The AEC Importer Plugin is "placed" when Cinema 4D is installed, but not installed in the plugin directory for Adobe.

Solution:
Navigate to MAXON / Cinema 4D Rxx / Exchange Plugins / aftereffects / Importer / [operating system] / [After Effects package]".

Now copy and paste the "C4DImporter(.aex)" file (If you have a ZIP file, you have to extract it first) into the Adobe AfterEffects CC Plug-ins Directory (Windows: "Program Files / Adobe After Effects CC 20xx / Support Files / Plug-ins", macOS: "Applications / Adobe After Effects CC 20xx / Plug-ins")