I have a pop-up killer and I still get those requests to install their garbage, whatever it is. I even wrote them to ask why they insist so much on me installing their stuff but they seemed not to understand what I was saying. They were under the impression I had willingly done something to get their installer program to appear while in fact I have tried desperately to avoid it. For some reason, they could not grasp the idea I wanted to have nothing to do with them. So I gave up and now I just manually close those windows whenever they appear.
I'll try the block site thing though.