Download the AtomsAgents bundle from the downloads page.
Extract the zip file after downloading.
Copy the AtomsAgents folder to C:\Program Files\Toolchefs (on Windows).
If you need to render the Agents with a render engine, please download the textures zip file from the downloads page.
Extract the textures zip file after downloading.
Copy the "textures" folder inside C:\Program Files\Toolchefs\AtomsAgents\data (if you are using renderman please have a look at this page)

Houdini

Add the following lines to your houdini.env file.

QT_PYTHON_API = "pyside2"

ATOMS_AGENTS_DATA = "C:/Program Files/Toolchefs/AtomsAgents/data"

# edit your PYTHONPATH so that contains
PYTHONPATH = "C:/Program Files/Toolchefs/AtomsAgents/houdini/python;&"

# edit your HOUDINI_PATH so that contains
HOUDINI_PATH = "C:/Program Files/Toolchefs/AtomsAgents/houdini;${HOUDINI_PATH}"

Maya

Copy the AtomsAgents_WINDOWS.module file from the AtomsAgents folder into the modules folder under Documents/maya (or in one of your modules path) and rename it to AtomsAgents.module .

Please note if you don't have a modules folder, you will have to create one.

Unreal Engine

Define a Windows environment variable called ATOMS_AGENTS_DATA and set its value to "C:/Program Files/Toolchefs/AtomsAgents/data".

To set an env variable on Windows please type "environment" in the search box and select "Edit the system environment variables", then click on the "Environment variables..." button in the "System Properties" dialog and create the new environment variable under the "User variables".