: You can find it under Window > Extensions > KBar .
: Unzip "Download File Kbar v3.1.2 (WIN MAC).zip" to access the installation files. Move to Extensions Folder : Download File Kbar v3.1.2 (WIN MAC).zip
: Open After Effects and go to Edit > Preferences > General (Windows) or After Effects > Settings > General (Mac) and ensure "Allow Scripts to Write Files and Access Network" is checked. : You can find it under Window > Extensions > KBar