FWIW: I would never advise anyone to download these days from Cnet and various other sites...just based on the amount of intrusive programs and malware likely to be picked up from a site visit.
I see what you're saying, I guess whenever I have downloaded there I would always use the direct download option and not their installer if offered which is where the issue was, and I've never infected my own computer with anything (from there or anywhere), nor any that I have worked on or fixed. The link I posted was simply the first search result that came up with some user reviews to look through (useful or not), and did not offer the "bad" download option. Also, clicking download gets the actual company's installer, no malware, no extras, no browsers hijacked or settings changed, and nothing on that page itself. And to confirm, it works like I stated above, and installs/functions fine. But searching for the program itself gets the direct download link of course. It is the program most often recommended on the satellite/cellular forums for figuring out what is using excessive data, it does its job fine.
Also to OP, it's often a good idea to get a router that you can set usage rules with if at home, to shut your connection down or other if you reach the cap, so you don't get overage charges. Depending what you are connecting with, a wifi hotspot can connect wirelessly to the router, or if a USB stick, some routers support those. Or if the service formerly called Homefusion, just the lan cable.