Download the file and rename it: 
factorio-admin-command-center_VERSION

e.g.: factorio-admin-command-center_3.1.1

3.1.1 is the version for example.

Get the version directly from the file


Installation:

Windows: %appdata%\Factorio\mods
Linux: ~/.factorio/mods/
MacOS: ~/Library/Application Support/factorio/mods/