Knowing this helps me give you the exact file paths!

How to install Plugins and Presets in After Effects (Windows)

Copy the downloaded plugin files ( .aex for plugins, .ffx for presets) into this folder. You can create subfolders for organization. Method C: ZXP Extension (.zxp)

After Effects plugins come in several formats. Choose the installation method based on what you downloaded. Method A: Installer (.exe or .pkg)