Hi Rich. There is a bit of setup required, but it's not as difficult as it sounds, and you should only have to do this once. Then any other RPC scripts that Kevin or other people post should just run without any hassle.
I'll go over the steps in a moment. But just to give you a high level overview of how you use Kevin's crater script, you can think of it as a sidecar program that talks to Terragen while they are both running. It's a standalone program, but it works a bit like a Terragen plugin. All you do is double click on the .py or .pyw file in your downloads folder, or wherever you put it on your hard drive, and it should open up the scatter craters UI. You open it from a normal Windows Explorer window; do NOT try to open it in Terragen because it's not a Terragen file.
You will need two things installed: 1) Python, and 2) an extra module for Python that allows Kevin's scripts to communicate with Terragen. That's the Terragen RPC module.
1) It sounds like you don't have Python installed, but other people reading this might have it installed already. To test that, download the .py file from Kevin's Github page and double click on the .py file in your downloads folder, or wherever it is on your hard drive (in Windows Explorer; do NOT try to open it in Terragen), and see what happens.
If you get an error about "terragen_rpc" then we know that Python is already installed and we just need to get terragen_rpc.
If you don't see anything at all, go into a Windows command prompt (run 'cmd' from Windows Start button or search field) and type in 'python -help' (without quotes), to see if python is installed.
I recommend
not using the Microsoft Store version of Python, but if you have it installed already then that's fine.
I recommend downloading Python from here:
https://www.python.org/downloads/When installing Python make sure you enable the option to set up the PATH environment variable in the Python installer.2) Go into a Windows command prompt again (click on Windows Start button and type 'cmd'). At the command prompt enter this:
python -m pip install terragen-rpc
This will find terragen-rpc on the pip server and it will automatically download it and put it in the right place in your Python installation.
That should be everything for the setup.
After everything's set up you won't need to do this again. And some day in the future we might have Python embedded in Terragen, and this'll get easier.
Now whenever Terragen is running you can can double click on the .py file (or .pyw file) in a Windows Explorer window.
Make sure only one instance of Terragen is running, otherwise RPC might talk to the wrong one.