Ok there are two different things going on here and you can choose to do either,but you do not need to do both:
- pull SD card, download the buster lite image with webcontrol on it. Unzipping should give an image file on your windows machine that you then write to the SD card (first file in your first post ->> 2020-02-13-webcontrolcnc-buster-lite-0.1.1.zip).
OR
- download the webcontrol single directory zipped file onto the pi that is already running and then
gzip -xzcf filename
to get a folder with webcontrol in it. You run it by
cd webcontrol
and then
./webcontrol
But you don’t need to do both and it won’t work if you do the #1 steps with the #2 file or vice versa as you have attempted already. You are so close. There is a step by step here.