You should realize that people with 4k+ reputation are much more familiar with the site that you are, and generally have a very good intuition about what is on-topic and what is not. They do not derive any particular benefit from closing questions, and so it is clearly not an arbitrary abuse of power. They are users who are simply trying to improve the signal to noise ratio on the site, and closing your off-topic question is part of that process.
But, I suppose you would like an explanation of why it was closed. Your question is about installing software. Installation help is not within the scope of Stack Overflow. If you have a question about how to make programs or how programs work, you can ask them here, but instructions for installation simply do not belong.