To connect Cargo to Cinema 4D, first follow the Basic Software Setup guide.
After you have selected your version of Cinema 4D, Cargo will install all necessary files to your computer and ask you to activate your plugin.
To enable the Cargo Plugin, open Cinema 4D and from the file menu navigate to:
Extensions → Cargo
The Cargo window will open. Click “Connect” and make sure the checkbox indicates “Connected to Cargo.
You can now continue to the Import test to complete Basic Software Setup.
Octane Materials Not Loading
If you're using Octane as your render engine, before you import assets from Cargo, click the “Render Settings” tab in C4D and change the render engine from “Standard Renderer” to “Octane Renderer”.