I am looking for the script "Stepped Chisel"
One that works in the current Gimp 2.10.18 / 20 (Windows)
I have attached an old scm file.
Thanks in advance!

The error was in one line procedure that was change for GIMP 2.10. On the line 274 the string "LINEAR" was changed to a number 1.

Thank you Poncholo, it works perfectly in Gimp 2.10.20

I don't know this script.
What does it do?

Thank you for this.

It will step your image, or a layer, or a selection. I haven't tried it without a selection on a transparent layer yet.

A selection isn't necessary but a layer with transparency and some content is a good idea. In my example above, I first used a whole picture without transparency, then I created a grey circle on a new transparent layer and ran the script on that too and put the layer in grain merge mode. No selection was active in either case.