Here are complete step-by-step instructions on how to install and activate Terraform4D.
Unpack the ZIP to
Cinema 4D Rxx/plugins.
2. Start Cinema 4D
Start Cinema 4D. In the Extensions menu (or, in R20, the Plugins menu), you will see the Terraform4D menu. Use the option Activate Terraform4D… to bring up the Activation dialog.
3. Request activation key
In the Activation dialog, copy the code, and request your activation key. Once you have received your key, enter it in the Activation dialog, click OK, and then restart Cinema 4D.
After restarting Cinema 4D, you will find the Terraform4D menu populated with all the components.
In case you are not sure if the plugin has loaded correctly, take a look into the Cinema 4D Console window. Terraform4D should output some messages here.