AVETools is an extension for After Effects CC or later version required that gives you quick access to its integrated effects packages.
To install AVETool extensions for Adobe applications we recommend using ZXPInstaller (ZXPInstaller.com).
For manually installing the extension:
1. Rename AVETools.zxp to AVETools.zip
2. Unzip the archive
3. Copy the AVETools folder in the directory with extensions for Adobe:
Windows: Program Files (x86)\Common Files\Adobe\CEP\extensions
macOS: Library/Application Support/Adobe/CEP/extensions
4. Reboot After Effects.