First, the mod should be extracted into a folder with files, not remain in the archive file.
Then you open config.lua in some form of text editor, Wordpad works. Find the line that mentions the small artifacts, and change the word true to false. all lower case letters just like that.
Save the file ...

i am a noob when it comes to changing configs on files, i found the txt files where i can change the small alien artifacts to false but i don't know how to save it so that it works as intended - stops small alien artifacts from spawning. so how can i disable the small alien artifacts correctly/save ...